What is MIMO?

MIMO is a wireless technology that uses multiple antennas at both the transmitter and receiver to improve communication performance. It involves multiple signal paths to increase data rates and spectrum efficiency. By employing multiple antennas, MIMO enables the transmission of multiple data streams simultaneously over the same radio channel. This spatial multiplexing technique can significantly increase the network capacity without requiring additional spectral bandwidth.

Implementation in LTE Antennas

LTE, a standard for wireless broadband communication, incorporates MIMO technology to enhance spectral efficiency and throughput. LTE antennas are designed to support various MIMO configurations, commonly referred to as 2x2, 4x4, and even 8x8. This refers to the number of transmit and receive antennas used in the system. For example, a 4x4 MIMO setup involves four antennas on the transmitter and four on the receiver, enabling four parallel data streams, thereby quadrupling the potential throughput compared to a single antenna setup.

Benefits of MIMO in LTE

1. Increased Data Speeds: MIMO technology allows for higher data rates by transmitting different data streams on different antennas. In LTE networks, this can lead to significantly faster download and upload speeds, enhancing user experiences in streaming, gaming, and real-time communications.
2. Improved Signal Reliability: MIMO improves the reliability of the signal through techniques like Transmit Diversity and Beamforming. Transmit Diversity increases the reliability of the transmitted signal by using multiple antennas to send the same data. Beamforming, on the other hand, improves signal quality by focusing the wireless signal towards a specific user rather than spreading it in all directions.
3. Efficient Use of Spectrum: By leveraging multiple antennas to improve the efficiency of the spectrum used, MIMO maximizes the throughput without additional spectrum requirement. This is crucial as the spectrum is a limited resource and expensive to acquire.
4. Better Network Coverage: MIMO technology can effectively increase the range and coverage of LTE networks. It helps in dealing with issues such as fading and interference, common in urban environments with numerous obstacles.

Challenges in MIMO Implementation

Despite its benefits, implementing MIMO technology in LTE networks comes with challenges. These include complexity in signal processing, increased power consumption, and the need for more sophisticated hardware. The design of antennas also becomes more complex as the number of antennas increases. Moreover, the actual performance gains can be influenced by various factors like user density, geography, and the physical environment.

Future of MIMO in Mobile Communications

As the demand for mobile data continues to surge, technologies like MIMO are crucial for the advancement of telecommunications networks. The future developments in MIMO technology, such as Massive MIMO, are expected to play a pivotal role in the rollout of 5G networks, offering even greater efficiency and capacity.

Conclusion

MIMO technology represents a transformative approach in the design and implementation of LTE antennas, promising substantial improvements in data speed, reliability, and efficient spectrum use. While it introduces some challenges, the benefits far outweigh these, making it a vital technology for the future of mobile communications. As LTE evolves towards 5G and beyond, MIMO will continue to be a key technology driving the enhancement of wireless networks around the world.

• Wi-Fi: Primarily uses the 2.4 GHz and 5 GHz bands.
• Bluetooth: Operates in the 2.4 GHz ISM band.
• Zigbee: Also uses the 2.4 GHz ISM band.
• LoRa: Works in various bands including 433 MHz, 868 MHz (Europe), and 915 MHz (North America).
• NB-IoT: Operates in the LTE frequency bands.
• 5G IoT: Utilizes a range from sub-1 GHz to mmWave frequencies.

Characteristics of Different Frequency Bands

• Lower Frequencies (e.g., 433 MHz, 868 MHz): Longer range, better penetration, lower data rate.
• Higher Frequencies (e.g., 2.4 GHz, 5 GHz): Shorter range, higher data rates, less penetration.
• mmWave Frequencies (used in 5G): Very high data rates, extremely limited range and penetration.

Factors Affecting Frequency Band Selection for IoT Devices

When selecting wireless technology for Internet of Things (IoT) applications, the following key factors need to be considered to ensure optimal performance and efficiency:

1. Range: The distance over which the IoT device needs to communicate is crucial. Short-range technologies like Bluetooth and Wi-Fi are suitable for home or office environments, while long-range technologies like LoRaWAN or NB-IoT are better for industrial or agricultural applications where devices are spread out over large areas.
2. Data Rate: Different applications require different data throughput. High-data-rate technologies like Wi-Fi are suitable for applications like video streaming, while low-data-rate technologies like Zigbee or LoRa are sufficient for sensors transmitting small amounts of data.
3. Power Consumption: IoT devices often run on batteries, so power efficiency is a significant consideration. Technologies like Bluetooth Low Energy (BLE) or Zigbee are designed for low power consumption, making them ideal for devices that need to operate for extended periods without recharging.
4. Network Topology: The structure of the network - whether it's point-to-point, star, mesh, or something else - affects the choice of technology. Mesh networks are robust and self-healing, ideal for smart home applications, and can be implemented with technologies like Zigbee.
5. Security: Security needs vary depending on the application. Technologies like Wi-Fi offer advanced security protocols, which are crucial for applications handling sensitive data.
6. Cost: The cost of implementing and maintaining the technology is always a consideration. Some technologies require more expensive hardware or have higher operational costs due to power consumption or network fees.
7. Interference and Reliability: In environments with many wireless devices or heavy machinery, interference can be a significant issue. Selecting a technology that operates on a less crowded frequency band or one that has robust interference mitigation techniques can be critical.
8. Scalability: The ability to scale the network as the number of connected devices grows is essential. Some technologies are better suited to small networks, while others can handle thousands or even millions of devices.
9. Regulatory Compliance: Wireless technologies must comply with regional regulations concerning spectrum use. It's important to choose a technology that is legal and optimized for use in the intended geographical area.
10. Latency: The time it takes for data to travel from the source to the destination can be critical in applications like industrial automation where real-time data processing is required.
11. Environmental Factors: The operating environment (indoor/outdoor, urban/rural, temperature extremes, etc.) can greatly affect the performance of wireless technologies.
12. User Requirements and Experience: Consideration of the end-user experience and specific requirements of the application, such as ease of setup and use, can also guide the choice of technology.

C-V2X stands for cellular vehicle to everything, a vehicle networking technology that uses the cellular network to enable vehicles to exchange data with other vehicles, transport infrastructure, and even pedestrians. It is an extension of the Internet of Things (IoT).

Data Alliance provides a wide variety of vehicle antennas, combination LTE / GPS antennas and other combo antennas, and antenna cables, for optimizing CV2X performance, as well as other network accessories for the CV2X equipment that is used both onboard vehicles and at the roadside.

With widespread C-V2X deployment expected imminently, finding high-quality components for vehicle to everything wireless solutions requires an experienced supplier and distributor who can remain responsive to an evolving technological landscape.

This digest covers the essentials of C-V2X networking, with a focus on the antennas and antenna accessories required to support optimal performance.

What is C-V2X technology?

Cellular Vehicle to Everything (C-V2X) is an autonomous vehicle technology that is emerging as a critical innovation to vehicles, transportation systems, and road infrastructure. C-V2X is distinguished from other forms of vehicular networking technologies by its use of the cellular network to support the necessary data exchange. It is distinct from Dedicated Short Range Communications (DSRC) that uses 802.11 WLAN connectivity.

V2X technology has been developed primarily to improve road safety, with imminently deployed applications expected to reduce the number of road traffic accidents. Enhanced data exchange between vehicles and their surroundings is also thought to be able to provide solutions for easing traffic congestion and reducing pollution as part of the developing agenda for smart cities and transportation systems.

C-V2X has been developed and standardized by the 3rd Generation Partnership Project (3GPP), the same body responsible for 3G, 4G/LTE cellular networking technology. The C-V2X standards produced by this body relate to cellular connectivity between vehicles and other suitably networked objects. The interactivity is short-range and wholly wireless, reliant on installed antennas and onboard sensors that can feed data to the driver of a vehicle about their environment. Within C-V2X systems, cellular antennas relay data for key vehicular communication modules including:

• Vehicle to vehicle: for enhanced driver awareness and refined automated control of the connected vehicle.
• Vehicle to network: for delivery of driver alerts. News streamed music and infotainment via the licenses mobile spectrum.
• Vehicle to infrastructure: support of interactivity (data exchange) between vehicles and infrastructure on roads including toll booths, traffic lights, and street signs.

Why is C-V2X important?

C-V2X is expected to improve road safety for all road users, including pedestrians and cyclists.

According to the US Department of Transport, over 90% of crashes involve some form of human error. C-V2X aims to prevent the circumstances that cause road accidents from occurring. By providing real-time data exchange with other vehicles and transport infrastructure, C-V2X aims to eliminate a significant proportion of collisions that occur by alerting and assisting drivers through applications like:

• Collision avoidance
• Vehicle platooning
• Lane-keeping assistance
• Obstacle detection
• Assisted parking

Is C-V2X 5G?

C-V2X uses both 4G/LTE and 5G cellular networking technologies to support its applications. C-V2X does not use a specific network for the exchange of data packets.

LTE-V2X is expected to be gradually upgraded to utilize 5G, which has lower latency, increased speed, robust connectivity, and enhanced security. Over one hundred thirty companies form the 5G Automotive Association (5GAA). This industry consortium assists in the development of V2X communication systems that are based on 5G New Radio. 5G improves connection reliability, decreases latency, and enhances security in the network.

What company makes C-V2X?

A variety of stakeholders are involved in the development and deployment of C V2X, which is expected to become an $11 billion industry by 2027. Data Alliance provides antennas, cables, connectors, and other wireless networking equipment that is required for introducing this connectivity to vehicles and transportation systems.

Understanding C-V2X Vehicle Antennas

C-V2X vehicle antennas are cellular networking antennas that are designed specifically to be operated while securely mounted on a vehicle. They are essential for operating an Intelligent Transport System. Their design and engineering allow them to withstand vibrations and shocks that come with being mounted on a moving vehicle. These antennas are a distinct antenna type from regular car radio antennas and are omnidirectional, allowing them to send and receive signals in all directions.

In-vehicle C-V2X antennas are a critical smart car component. They are usually multiband antennas that support not only cellular networking but GPS, WiFi, and Bluetooth, which may also be necessary for the deployment of an autonomous vehicle solution or management of fleets of connected vehicles. GPS in particular is essential for lane accuracy at present. They can also function as telematic antennas, providing high-speed data transfer vehicle telemetry.

The combination design of these antennas includes multiple elements that are tuned to the frequencies required for each technology used, at least 3G, 4G/LTE, and now 5G frequencies. Puck or Sharks-fin designs have a strong radio-permeable radome and polyurethane foam packing to protect the sensitive elements.

Key frequencies used for C-V2X

For direct communications between vehicles, road users and infrastructure (safety applications) C-V2X primarily uses the Intelligent Transport Band (5.9 GHz) which has been internationally agreed to be set aside for both C-V2X and DSRC. This frequency band operates independently of cellular networks and is harmonized internationally.

• The Intelligent Transport Band spans 5 875 and 5 905 MHz and is reserved for priority safety-related data exchange.
• The 3.4 GHz to 3.8 GHz and 3.4 to 4.2 GHz bands are also favored as alternatives frequency bands for C-V2X

View 4.9 to 6.1 GHz antennas by Data Alliance

Network-supported cellular communications are also used in C-V2X, and use the end-user cellular networks to communicate with vehicles using standard GSM, 3G, 4G/LTE, or 5G technology. The type of information relayed is usually local traffic updates of alerts. These services are provided by cellular network operators. The frequency bands used include:

• 850 MHz
• 950 MHz
• 1700 MHz
• 1900 MHz
• 2300 MHz
• 2500 MHz
• 2600 MHz

View cellular antennas for GSM, 3G, 4G/LTE, and 5G

Antennas for C-V2X real-world testing

As investment, development, testing, and deployment of applications for transportation system safety and efficacy increase, the demand for CV2X antennas that can be used in developing a standardized and widely adopted certification system will increase. Currently, suitable cellular and WiFi vehicular antennas are being used to create custom test solutions and sub-assemblies that can demonstrate CV2Xs enhancement of road safety, for wider adoption in the automotive industry.

Developers, manufacturers, and vendors are currently seeking to gain a suitable Qualified Test Equipment (OQTE) status that will enable the creation of commercially viable products that can be used in the transportation system. We can provide antennas for:

• C-V2X Testing Laboratory setup
• Connected vehicle testing
• Cellular antennas for C-V2X Physical layer development
• C-V2X product design and development
• Dedicated Short-Range Communications (DSRC) testing
• Advanced Driver Assistance Systems (ADAS) testing
• Onboard unit (OBU) product development
• Roadside unit (RSU) product development

For safety reasons antennas used for V2X applications must meet a minimum effective communication range to ensure that the driver can react to changes in their environment or road conditions in sufficient time. Industry requirements specify that the minimum range of a V2X communication antenna must be 300 meters (400 meters in Europe), a distance where the packet error rate (PER) is less than 10%.

For cellular-V2X networking, the 3GPP requires the use of not only a transmitting (Tx) antenna but at least two receiving (Rx)antennas, in keeping with the specification for LTE connectivity. The antennas are usually installed in a front-rear arrangement. This contrasts with vehicles typically using a single antenna wherever possible for both design and cost purposes. Alternative vehicle antenna setups may include a cable compensator which is used to enhance link quality and boost signal coverage to ensure that it is compliant with the relevant V2X networking standards.

Antennas are a significant contributor to the costs of implementing a C-V2X system, so single antenna solutions that would drive down costs and increase adoption of the technology are desirable as the widespread use of this form of networking would reduce system costs further still.

The performance of an antenna used in a C-V2X system will depend on its antenna pattern and its location on the vehicle. The vehicle shape will also impact the achievable range of a cellular antenna used for this purpose. V2X antenna testing helps to determine the optimal number and arrangements of antennas to meet the necessary networking standards and specifications.

Example C-V2X testing completed with cellular antennas

[A&91; Turntable test

Turntable testing involves measuring the 360-degree coverage of a vehicle-mounted antenna. This test involves installing a Tx antenna and an Rx antenna on two separate vehicles placed 200m apart. The Tx vehicle remains stationary, but the Rx antenna vehicle is moved to sound the Tx vehicle with measurements of the received signal strength (RSSI) measured at 0°, 90°, 180°, and 270°.

[B&91; Line-of-Sight (LOS) communication range

LOS V2X antenna testing takes place in an active traffic environment where just under 2 kilometers of unobstructed view is available between the Tx and Rx vehicles. The Rx vehicle is stationary while the Tx vehicle approaches it at moderate speed.

[C&91; Non-Line-of-Sight (NLOS) communication range

This V2X antenna testing is undertaken with a Tx antenna vehicle and an Rx antenna vehicle on an open public road at an intersection where the direct view of the two cars is blocked. The Rx vehicle remains stationary at a short distance from the vehicle intersection while the Tx antenna approaches at a steady speed.

C-V2X antennas for development kits

Dev kits for C-V2X applications require high-quality cellular antennas, connectors, and cables for the creation of novel C-V2X-based solutions. PCB dev kits can be used to build systems that can be practically configured to recreate hazards and dangers and create the alerts needed to make a driver take action.

Kits usually are based on an OBU cellular modem which can handle the throughput required for real-world cellular-V2X connectivity, with suitable dev kits able to process up to 2000 messages per minute. The modem can be connected to a laptop meaning that firmware can be developed at the same time. Typical cellular modems with 4G/LTE will be able to support the connection of two external antennas that can be used to recreate and model the short-range communication of C-V2X while connecting the PCB to other components and processors or undertaking in-situ radio frequency testing.

Diversity Schemes and C-V2X Antennas

C-V2X uses specific antenna diversity schemes to enhance the robustness of their connectivity. in an active traffic environment. This requires a multi-antenna installation of the vehicle.

• Cyclic Delay Diversity (CDD) is a type of antenna diversity that is widely used and involves multiple Tx antennas transmitting data, simultaneously at the same frequency with a phase delay applied to each antenna to prevent interference.
• Switching Diversity is another diversity scheme used in V2X and involves alternating transmission between the Tx antennas. Cable compensators may also be used with switching diversity vehicle antennas to compensate for cable losses from the secondary antenna.

C-V2X Antennas for cellular modems

Cellular Vehicle–to–Everything is reliant on powerful cellular modules that can support the high-speed data exchange over extended distances, which is required in a motoring environment. They are a critical component in On-Board Units (OBU) that do the grunt work of vehicle communication. Hardware agnostic cellular modems are already in use in a range of networked vehicles including emergency service vehicles and haulage fleets. Unlike the PCI wireless cards used in computing, these modules are rugged and reliable in mission-critical circumstances and over thousands of miles of real-world testing.

Modules and modems may incorporate GNSS and WiFi radios and typically facilitate the connection of a suitable high-gain external antenna, via a pigtail connector to a surface-mounted jack on the modem, or an externalized SMA connector described below.

Cables and networking accessories for C-V2X

In addition to antennas, high-quality coaxial cables, radio frequency connectors, and adapters are needed to ensure that an installed CV2X setup is not compromised by signal loss or interference. The choice of cables and connectors used for setting up a C-V2X module in a vehicle need to be flexible and of a diameter that allows easy routing without damage. They may be used in the manufacture of the vehicle or in retrofitting a car with C-V2X technology. The use of GPS networking, in particular, necessitates the use of a low-loss coaxial cable and a variety of in-line and pigtail adapters can be used to achieve the connectivity required down to PCB-level. Aside from antennas, here are some key C-V2X components we carry:

Coaxial cable for C-V2X applications

• LMR 100 is a high-quality coaxial cable that is renowned for its low levels of attenuation. The low-loss performance is due to two layers of shielding surrounding the cable insulator; one made from foil and the other a tinned aluminum braid. LMR 100 is highly flexible with a diameter of 2.79 millimeters that makes it easy to rout in compact spaces. It has a 50 Ohm impedance and a maximum frequency of 5.8 GHz.
• LMR 200 is similarly double shielded, though, with a larger diameter (4.95 millimeters), it remains flexible through having a foam dielectric. Low loss cables like these are essential for GPS and other sensitive components. The impedance of LMR 200 is also 50 Ohm and the maximum frequency it supports is 5.8 GHz.

Key C-V2X radio frequency connectors

SMA connectors for C-V2X

SMA connectors are subminiature threaded radio frequency connectors that are widely used in cellular networking, GPS, and now as a connector of choice for C-V2X applications. These 50-Ohm connectors can support broadband frequencies up to 18 GHz with good power handling and secure, robust mating that is rated for up to 500 mating cycles. The screw coupling of the SMA connector is secure against vibrations or jolting; the male center pin is inserted into the female receptacle when correctly mated.

• SMA pigtail adapters can be used to connect an external antenna directly to a cellular modem.
• SMA connector adapters are used to make other secure connections to other classes of connectors within a C-V2X radio frequency circuit.

View SMA cables and connectors

MMCX connectors for C-V2X

The MMCX connector is one of the smallest radio frequency connectors with a mated height of only 5.2mm. It is similar in design to the SMB connector and mates with a snap-lock mechanism that can be repeated over 500 times despite its small size. It is a connector that is chosen for secure mating wherever space is limited, or component density is high. Like most commercially available radio frequency connectors, its impedance is 50 Ohm. The maximum frequency that the MMCX connector can support is 6 GHz; more than adequate for supporting C-V2X applications.

View MMCX cables and connectors

U.FL and MH4 connectors

These miniature connectors are routinely selected for PCB mounting due to their small size of only a few millimeters. They are often used to connect external antennas to a cellular modem, within a module.

Mating is achieved by pressing down the connector onto a surface-mounted jack until a tactile click is felt or by the use of an insertion tool. Because the connectors are so small they are only rated for 30 mating cycles. U.FL and MH4 connectors have an impedance of 50 Ohms and a frequency range of DC to 6 GHz.

View U.Fl cables and connectors

FAKRA connectors for C-V2X

Facheris Automobil or FAKRA connectors are a specialist radio frequency connector that has been exclusively developed for the automotive industry. Its design is based on the SMB connector but it carries additional colored plastic housing that makes a clicking sound when the connector is mated.

The housing protects and orients the connector and prevents the attached coaxial cable from twisting or becoming strained over time. The connection is vibration and shock resistant and is secure for up to 100 mating cycles.

FAKRA connectors come in 14 sizes. The male connector carries a pin and the female connectors carry a receptacle. They are 50 Ohm connectors, capable of supporting frequencies up to 6 GHz.

View FAKRA cables and connectors

C-V2X Cable Assemblies and Optimizations for Connections

Ensuring optimal signal transmission and reception in C-V2X systems relies not only on selecting the right connectors but also on choosing appropriate cable assemblies. Here's how cable extensions and adapter cables can optimize C-V2X connections:

Cable Extensions:

SMA Extension Cables: These cables extend the reach of an SMA antenna, providing more flexibility in antenna placement. This can be crucial for positioning the antenna on the vehicle's roof or trunk lid for improved signal strength.

RP-SMA Extension Cables: Functionally similar to SMA extension cables, they utilize reverse polarity SMA connectors to prevent accidental mismatches during installation.

Adapter Cables for Connector Transitions:

SMA to U.FL Cables: These cables bridge the gap between antennas with SMA connectors and cellular modems that have U.FL or RP-SMA jacks. They ensure compatibility between different connector types commonly found in C-V2X systems.

RP-SMA to U.FL Cables: Designed for scenarios where the antenna uses RP-SMA connectors and the modem uses U.FL jacks, these cables facilitate a seamless connection.

U.FL to SMA Cables / U.FL to RP-SMA Cables: Conversely, these cables cater to situations where the antenna has U.FL connectors and the modem requires SMA or RP-SMA connections.

Other relevant components

Ethernet ports and cables may also be used to support complementary applications like dashcams, printers, or ticketing equipment used by emergency service personnel or delivery drivers.

View Ethernet cables and connectors

The 0.81 coaxial cable is the typical coax used for  W.FL cables and MHF3 cable assemblies.  This article provides an in-depth understanding of the 0.81 coaxial cable, focusing on its compatibility with IoT wireless technologies, key features, material composition, and applications. It is also used for  MHF4 cables.

The thickest, lowest-loss coax that can accommodate W.FL and MHF3.  0.81 coax is very rarely used for U.FL cables, because U.FL connectors can accommodate larger-diameter coax types, with better attenuation characteristics."

Compatible Wireless Technologies

The 0.81 coaxial cable stands out for its capability to support a variety of wireless technologies and protocols, ensuring robust and stable communication within diverse application contexts. Below is an outline that organizes and highlights its compatibility and applications across various wireless protocols and technologies.

I. Wi-Fi Technologies

A. Wi-Fi 4 (802.11n)

1. Employed in both residential and commercial wireless networks.

2. Usage in devices like routers and access points.

B. Wi-Fi 5 (802.11ac)

1. Known for high-throughput wireless networks.

2. Utilization in high-speed data transmission applications.

C. Wi-Fi 6 (802.11ax)

1. Emphasis on improving network capacity.

2. Adoption in environments with dense user access.

II. Cellular Technologies

A. 3G (Third Generation):  

1. Legacy systems in remote and developing areas. 
2. In applications that require minimal data transmission.

B. 4G/LTE and LTE-m: Prevalent in modern telecommunications. Critical for high-speed internet access and data communication.

C. 5G: Adoption in next-gen applications, including IoT and smart cities.  Utilization in applications demanding ultra-reliable low-latency communication.

III. Bluetooth Technologies

A. Classic Bluetooth

1. Utilized for short-range communication between devices.

2. Applicable in peripherals, audio devices, and automotive applications.

B. Bluetooth Low Energy (BLE)

1. Designed for applications that require minimal power consumption.

2. Widely used in wearables, sensors, and smart home applications.

IV. Internet of Things (IoT) Technologies

A. Zigbee

1. Notable for low-cost, low-power wireless mesh networks.

2. Applied in smart home, industrial automation, and low-bandwidth applications.

B. LoRa (Long Range)

1. Utilized for long-range communication in IoT networks.

2. Applicable in agriculture, smart cities, and environmental monitoring.

C. NB-IoT (Narrowband IoT)

1. Employed for wide-area networks to connect various IoT devices.

2. Usage in smart metering, smart parking, and utility monitoring.

V. Satellite Communication Technologies

A. C-Band

1. Utilized for satellite communication, especially in television transmission

2. Applies in direct-to-home broadcasting and satellite internet

B. X-Band

1. Primarily used for military communication and weather monitoring

2. Integration in radar applications and satellite communication

VI. Radio Communication Technologies

A. VHF (Very High Frequency)

1. Adoption in maritime and aviation communication

2. Applied in line-of-sight ground communication

B. UHF (Ultra High Frequency)

1. Utilized for broadcasting and emergency communication

2. Engaged in military, public service, and commercial applications

Materials Composition

I. Inner Conductor

A. Material

1. Typically made of copper

2. Alternatives like aluminum may be used

B. Characteristics

1. High electrical conductivity

2. Essential for transmitting the signal

II. Dielectric Insulator

A. Material

1. Commonly polyethylene or PTFE

2. Other high-insulation materials may be utilized

B. Function

1. Prevents signal loss by isolating the inner conductor

2. Maintains the conductor’s position, ensuring consistent impedance

C. Characteristics

1. High resistance to electrical conductivity

2. Stability across varied temperatures

III. Shielding

A. Material

1. Often comprised of aluminum or copper braiding

2. May include a foil layer for additional shielding

B. Purpose

1. Guards against external electromagnetic interference (EMI)

2. Protects against radio frequency interference (RFI)

C. Types

1. Braided Shield: Composed of woven strands of metal

2. Foil Shield: A layer of aluminum or metallic foil

3. Dual Shield: Incorporates both braided and foil shields

IV. Outer Jacket

A. Material

1. Frequently made of PVC

2. Other materials like PE, used based on application requirements

B. Role

1. Protects the inner layers from physical damage and environmental factors

2. Provides insulation to prevent unintended conductivity

C. Characteristics

1. Resistant to physical wear and tear

2. Ability to withstand varied environmental conditions

Attenuation Characteristics

1. Frequency-Dependent Attenuation

• Higher Frequency, Higher Attenuation: 0.81 coaxial cables, when used in MHF4 assemblies, tend to have an increase in attenuation as the frequency of the signal increases. This is a common characteristic of coaxial cables and is especially vital to consider in applications that utilize higher frequency bands.

2. Material Impact on Attenuation

• Dielectric Material: The type of dielectric material used in the 0.81 coaxial cable impacts its attenuation characteristics. Materials that have a low dielectric constant can help to minimize attenuation.
• Conductor Material: Similarly, the material used for the inner conductor will also impact attenuation. Generally, conductors with higher electrical conductivity, such as silver-coated copper, can help reduce signal loss.

3. Temperature Impact

• Variable Attenuation: The attenuation characteristics of 0.81 coaxial cables in MHF4 assemblies may vary with temperature fluctuations. Different operational environments, especially those with extreme temperatures, may influence the level of signal loss.

4. Cable Length

• Direct Proportionality: Attenuation is directly proportional to the length of the cable. Longer cables will inherently have higher attenuation compared to shorter ones. In applications where signal integrity is paramount, utilizing the shortest possible cable length is advisable.

5. Connectors and Adapters

• Additional Attenuation: The connectors and adapters used in the MHF4 cable assembly can also introduce additional attenuation. Therefore, the selection of high-quality connectors that are specifically designed to minimize signal loss is crucial.

6. Installation Impact

• Bending and Coiling: The way the cable is installed can impact attenuation. Excessive bending or coiling of the cable can result in increased signal loss, especially in high-frequency applications.

7. Shielding Effectiveness

• EMI and RFI Protection: Effective shielding is essential to protect the signal from external electromagnetic interference (EMI) and radiofrequency interference (RFI), which can also contribute to attenuation.

8. Signal Reflection

• Impedance Mismatch: Attenuation can also be affected by signal reflection caused by impedance mismatches within the cable assembly. Ensuring that components are impedance-matched helps in minimizing reflections and maintaining signal integrity.

Connector Types:   

MHF4 cable assemblies, with the other connector type, chosen based on frequency, impedance, and application, being any of of the following: SMA, RP-SMA, Type N, MMCX, BNC, U.FL

Key Features & Attributes

The 0.81 coaxial cable encompasses several key features that contribute to its widespread use and reliability in RF signal transmission. Noteworthy among these are:

• Thin enough to accommodate the assembly of W.FL, MHF3 cables.
• Used for short antenna cables, being the thinnest of the coax and with a very thin diameter conductor wire.
• High-Frequency Performance: Enables the transmission of signals at higher frequencies with minimal loss.
• Impedance Stability: Ensures consistent impedance, minimizing reflections and maintaining signal integrity.
• Resistance to EMI: Provides a shield against external electromagnetic interference, safeguarding the transmitted signals.
• 0.81 coax is very rarely used for U.FL cables, because U.FL connectors can accommodate larger-diameter coax types, including 1.13mm, 1.32mm, 1.37mm and RG174.
• 0.81 coax is not used for SMA cables nor RP-SMA cables unless the other connector is W.FL or MHF3.

The 0.81 coaxial cable, with its distinctive layered structure, facilitates reliable and high-quality signal transmission in various applications across industries. From the internal conductor transmitting the RF signal to the external jacket protecting the internal components and insulating the cable, each layer plays a critical role in ensuring effective and stable signal transmission and protection against potential interferences and physical damages. It's the combination of these structural elements that culminate in the cable's widespread adoption and efficacy across numerous applications and environments.

N-Type connectors are the most corrosion-resistant antenna connector type, because the outer-body is plated with nickel, which is the best plating alloy to resist rust and corrosion.  Nickel-Plated Brass is better than gold-plated brass, for long-term outdoor exposure.

• Our standard nickel-plated connectors can resist 70 hours in a salt spray test without any corrosion-defect.
• Our coaxial cables for antenna cable assemblies can resist 120 hours in a salt spray test without any corrosion-defect:  This applies for LMR-100-equivalnet, LMR-200 equivalent, and LMR-400 equivalent coax types.
• For corrosion-resistance of 120 hours in a salt spray test: We have to customize the connector. This adds an additional 4 weeks delivery time and the product cost will be 20% higher than the standard cable assembly.

Here's how the salt spray test is typically conducted for these components:

1. Test Setup:
   • The components (antennas, connectors, and cables) are placed in a closed testing chamber.
   • A salt solution, usually 5% sodium chloride (NaCl) dissolved in water, is prepared. The pH of this solution is typically adjusted to be within the range of 6.5 to 7.2.
2. Spray Method:
   • The salt solution is atomized using a nozzle to create a fine mist or fog within the chamber. This ensures that the solution is evenly distributed over the test specimens.
3. Exposure Period:
   • The duration of exposure can vary depending on the test standard being followed, but typically ranges from a few hours to several days. Common standards such as ASTM B117 or ISO 9227 specify different durations and conditions based on the expected environmental exposure of the product.
4. Conditions:
   • The temperature within the chamber is maintained at 35°C (95°F) to accelerate the corrosion process.
   • The specimens are periodically inspected to assess the development of rust or corrosion marks.
5. Evaluation:
   • After the exposure period, the components are removed and evaluated for signs of corrosion, such as rust, pitting, or changes in electrical properties (important for antennas and cables).
   • The degree of corrosion is documented, often with photographs, and used to determine whether the component meets the required corrosion resistance standards.
6. Standards:
   • Different standards may apply depending on the specific application of the antenna or cable. Military and marine applications, for example, might require adherence to more stringent standards due to their harsher operating environments.

The salt spray test helps antenna manufacturers to ensure that their products can can maintain functionality and longevity in corrosive coastal environments.

These are typical values for the capacitance per foot or per meter of these coaxial cables used in antenna cables:

• LMR-100: Approximately 30.8 pF/ft (101.1 pF/m)
• LMR-195: Approximately 25.4 pF/ft (83.3 pF/m)
• LMR-200: Approximately 24.5 pF/ft (80.3 pF/m)
• LMR-400: Approximately 23.9 pF/ft (78.4 pF/m)
• RG-174: Approximately 30.8 pF/ft (101 pF/m)
• RG-178: Approximately 29.4 pF/ft (96.4 pF/m).
• RG-213: Approximately 30 pF/ft (98.4 pF/m).
• RG-58: Approximately 30 pF/ft (98.4 pF/m).
• RG-8: Approximately 29 pF/ft (95 pF/m).

These values indicate the capacitance per foot (or per meter) of the cable, which is a key factor in determining the performance of the cable in high-frequency transmission scenarios, such as in wireless communication systems and antenna setups.

Lower capacitance in an antenna cable indicates better signal integrity for six reasons

The capacitance of a coaxial cable is a significant factor that influences the performance of the cable in high-frequency applications. It affects signal integrity through increased attenuation (signal loss), impedance mismatches, and phase shifts, all of which can degrade the signal quality over distance. Therefore, choosing the right cable with appropriate capacitive properties is essential for maintaining optimal signal integrity in any communication system.

1. Signal Attenuation: Higher capacitance in a cable can lead to greater attenuation of the signal, especially at higher frequencies, and over longer distances. This is because capacitance can cause more of the signal's energy to be stored in the cable rather than transmitted through it, leading to diminished signal strength over distance.  At higher frequencies, the effect of the cable’s capacitance is more pronounced because it creates a low-pass filter effect, attenuating higher frequency components more than lower ones.
2. Noise and Interference: Capacitance can affect the cable’s susceptibility to external noise and interference. A well-designed coaxial cable with appropriate capacitance helps in shielding the signal from external electromagnetic interference (EMI), maintaining the purity of the signal.
3. Bandwidth: Capacitance influences the bandwidth of the cable. Higher capacitance generally limits the bandwidth, affecting the cable's ability to carry high-speed data without distortion. This is particularly relevant in digital communication systems where bandwidth and data rate are closely tied.
4. Capacitive Reactance: Capacitance in the cable contributes to its overall impedance, specifically capacitive reactance, which is inversely proportional to the frequency of the signal and the capacitance. This means that at higher frequencies, the capacitive reactance decreases, allowing more of the signal to be attenuated. This is especially critical in long cable runs where the cumulative effect of capacitance can significantly weaken the signal by the time it reaches its destination.
5. Impedance Mismatching: Mismatches can lead to signal loss and degradation. The capacitance of a coaxial cable contributes to its characteristic impedance. Proper impedance matching is essential to minimize signal reflection at connections between the cable and other components like antennas and receivers. Ideally, the impedance of the coaxial cable should match the impedance of the rest of the system (commonly 50 or 75 ohms) to minimize reflection losses. Capacitance can alter the impedance of the cable, potentially leading to mismatches. Impedance mismatches can cause part of the signal to be reflected back towards the source, effectively causing signal loss.
6. Phase Shift and Delay: The capacitance (capacitive nature of the cable) affects the phase of the signal passing through the cable, because it can introduce a phase shift and delay in the signal. This is because the signal's electric field interacts with the cable's capacitive properties, which can delay the timing of the signal's propagation through the cable. In digital communications, such as digital video or data transmissions, this can lead to errors or degradation in the quality of the received signal.

In antenna and radio frequency applications, selecting a coaxial cable with the appropriate capacitance is essential to ensure effective transmission and reception of signals without significant loss or distortion. This is why the electrical properties, including capacitance, are specified and controlled carefully in the design and selection of coaxial cables for specific applications.

The RG-series cables are often used in various radio frequency applications and have different specifications to meet the needs of different systems, such as amateur radio setups, antenna feeds, and more. Each cable type offers specific characteristics in terms of power handling, attenuation, and flexibility, influencing their choice for certain applications.

The LMR-series coaxial cables are 50-ohm, low-loss, flexible coaxial cables widely used for carrying high-frequency RF signals in various applications, including feeding signals between wireless communication systems and their antennas. The cable features a solid copper-clad aluminum conductor with Foam Polyethylene (Foam PE) insulation, two shielding layers for protection against electromagnetic interference, and a durable Polyethylene (PE) outer jacket

Use one of these high-quality, double-shielded coaxial cable types:

• For longer cable runs: Use LMR-400 or equivalent, to minimize signal loss.
• For cable runs of two feet up to six feet: Depending on your need for cost-efficiency diameter and bend radius: You can use LMR-400, LMR-200, or LMR-100.
• For cable runs: You should use LMR-200 or LMR-400, for lower signal loss (attenuation). You can use LMR-100 up to as long as 12 feet, but it's better to use LMR-200 or 400.
• For longer cable runs, over 20 feet:  You can use LMR-200, but you should more seriously consider LMR-400 due to its low loss characteristics at Wi-Fi frequencies.

Other considerations to help you make an informed decision:

1. Impedance: Ensure the cable impedance matches your system requirements. Wi-Fi and LTE equipment use 50-ohm cable. LMR-100, LMR-200, and LMR-400 all are compatible 50-ohm coaxial cable types,  Using the wrong impedance can lead to signal loss and reduced performance.
2. Shielding: Good cable shielding is important to protect against interference from other electronic devices and signals, especially in crowded urban environments.  Look for a cable with multiple layers of shielding, such as a combination of foil and braided metal. LMR-100, 200 and 400 are double-shielded, and thus offer better interference rejection than single-shielded RG-series cables.
3. Attenuation: Attenuation refers to signal loss over the length of the cable. It's important to choose a cable with low attenuation, especially for long runs. The cable's datasheet should list attenuation values at different frequencies, allowing you to choose a cable that minimizes loss at Wi-Fi frequencies (2.4 GHz and 5 GHz).  The various coax types have have different amounts of signal loss per foot (or meter), that varies based on the shielding and the diameter of the conductor wire. Check the specifications for attenuation, which is usually given in dB per 100 feet. Lower is better.
4. Cable Length: Use the shortest length of cable possible to connect your antenna to your device. Longer cables result in more signal loss (attenuation). In some cases, you might need to extend the reach of an existing cable connection. In such scenarios, you can use an SMA extension cable. These cables maintain the same connector type (SMA) on both ends and allow you to add additional length to your existing cable run while minimizing signal loss. In such a situation, you can use antenna cable adapters to switch between different connectors.
5. Weather Resistance: Since the installation is outdoors, the cable must be able to withstand environmental conditions such as UV exposure, rain, and temperature fluctuations. Look for cables with UV-resistant jackets and waterproofing features. Weatherproofing for cables and connectors for outdoor use, and a durable outer jacket are important features, especially for installations that will be exposed to the elements.
6. Flexibility and Durability: Consider the installation environment and whether the cable needs to be routed through tight spaces or around sharp corners. Some cables are more flexible, but this can sometimes come at the cost of durability and shielding effectiveness.
7. Connector Compatibility: Ensure the cable is compatible with the connectors used by your antenna and Wi-Fi equipment. The most common connectors for outdoor Wi-Fi antennas are N-Type. SMA cables can also be used in certain situations. They offer a good balance between performance and cost compared to LMR cables and might be suitable for specific applications where N-Type connectors are not compatible. RP-SMA is more common for indoor antennas.. The quality of the connectors and the installation (properly crimped and weatherproofed) are crucial for maintaining signal integrity.  
8. Use Quality Connectors: Poor-quality connectors can introduce noise and signal loss. Use high-quality, corrosion-resistant connectors and ensure they are properly attached.  Nickel-plated Type-N connectors are the superior option for outdoor installations.
9. Length: Minimize the cable length to reduce signal loss, but ensure it's long enough to reach from your Wi-Fi device to the antenna without stretching or creating sharp bends.
10. Shielding: Double or triple-shielded cables can offer better protection.
11. Cost: While it's important to choose a high-quality cable to ensure the best performance of your Wi-Fi antenna, consider your budget. More expensive cables offer better performance but evaluate if the cost is justified for your specific needs.
12. Brand and Quality: Choose cables from reputable manufacturers to ensure quality and reliability. It's also beneficial to read reviews and seek recommendations from professionals or forums where similar installations are discussed.
13. Frequency Range: Ensure the cable can handle the frequency range required for your application. LMR-100, LMR-200 and LMR-400 all are compatible with the Wi-Fi and LTE frequency bands.

Remember, the best cable for your installation depends on your specific needs, the distance between your antenna and your wireless device, the type of signals you're receiving (e.g., Wi-Fi, LTE, GPS), and the environment in which the cable will be installed.

By following these guidelines, you can ensure a tidy and efficient  antenna cable installation that maintains the integrity and performance of your antenna system.  Proper installing and routing is important for ensuring optimal signal reception and minimizing signal loss. Here are some best practices:

Minimize Cable Length: Keep the cable as short as possible to reduce signal loss. The longer the cable, the more signal is lost. In such situations, U.FL cables are a type of miniature RF cable commonly used for short runs due to their low signal loss.

Avoid Sharp Bends: Sharp bends can damage the cable and degrade the signal. Maintain a gentle curve in the cable instead of bending it at a sharp angle. MHF4 cables are more robust than U.FL cables and can withstand tighter bends, making them suitable for applications with limited space.

Avoid Electrical Interference: Route the cable away from electrical wiring when possible to avoid interference. Keep a distance of at least 6 inches from power lines.

Grounding: Properly ground the antenna and cable to protect your equipment from lightning strikes and reduce electrical noise. Follow local codes for grounding requirements.

Properly Seal Outdoor Connections: If the cable runs outside or through an exterior wall, make sure all connections are waterproofed. In some cases, using weatherproofing/waterproofing solutions for connectors will be crucial.

Antenna Cable Management

If you need to extend the reach of an existing SMA Cable or RP-SMA Cable, consider using SMA Extension Cables or RP-SMA Extension Cables. Also using cable clips or conduits to secure the cable, especially when running it along walls or under eaves will prevent damage from environmental factors and physical strain. Proper cable management is crucial when installing antenna cables, as it ensures not only a neat appearance but also reduces the risk of damage and interference. Here are some key tips for managing antenna cables effectively:

1. Plan Your Route: Before running the cable, plan its route from the antenna to the receiver. Avoid long, circuitous paths. Try to find the shortest and most direct route while considering potential obstacles.
2. Use Appropriate Cable Clips or Clamps: Secure the cable at regular intervals using suitable clips or clamps. This prevents sagging and reduces the risk of the cable getting caught or damaged. Ensure that the clips or clamps are tight enough to hold the cable but not so tight that they crush or pinch it.
3. Avoid Sharp Bends: Sharp bends can damage the internal structure of the cable, leading to signal loss. Maintain a gentle curve in the cable wherever turns are necessary.
4. Keep Distance from Electrical Cables: Running antenna cables parallel to electrical power cables can introduce interference. Keep them as far apart as possible. If they must cross, do so at a 90-degree angle.
5. Use Cable Conduits for Protection: In areas where the cable might be exposed to physical damage, like in a garage or along the outside of a building, use conduits to protect the cable.
6. Label Your Cables: If you are running multiple cables, label them at both ends. This makes it easier to identify and troubleshoot them in the future.
7. Allow Some Slack: Always leave a bit of extra cable at both ends of the run. This slack can be useful if you need to reposition equipment or if a connector needs to be replaced.
8. Use Weatherproofing in Outdoor Installations: For cables that run outside, use weatherproof cable or add weatherproofing measures, like sealing connections with weatherproof tape or using outdoor-rated cable conduits.
9. Grounding and Lightning Protection: If your antenna is outdoors, make sure it is properly grounded. This helps to protect against electrical surges due to lightning strikes.
10. Regular Inspection and Maintenance: Regularly check your cable runs for damage, wear, or loose fittings, especially if they are exposed to the elements.

Labeling for Antenna Cable Management

If you have multiple cables or cables with different connectors, label them for easy identification in the future. Labeling antenna cables is an essential aspect of cable management, particularly when dealing with cables with different connectors. Proper labeling helps in easy identification, troubleshooting, and maintenance. Here are some effective methods and tips for labeling antenna cables:

1. Label Near Both Ends: Place labels near both ends of each cable - close to the antenna and near the receiver or connection point. This makes it easier to identify the cable at either end without having to trace its entire length. In situations where you need to connect cables with incompatible connectors, antenna cable adapters provide a convenient solution. Therefore, labeling both ends of the points where you transition between different cables such as SMA to U.FL, RP-SMA to U.FL, U.FL to SMA, U.FL to RP-SMA can make addition and maintenance tasks significantly easier when necessary.
2. Use Durable Labels: Choose labels that are durable and resistant to environmental factors like moisture, heat, and UV light, especially for outdoor antenna installations. Commercially available cable labels, heat shrink labels, or even UV-resistant markers can be effective.
3. Include Relevant Information: On the label, include information that will help identify the cable's purpose or destination. For example, you might include the antenna it's connected to (if you have multiple antennas), the type of signal it carries (e.g., TV, radio), or the room or equipment it leads to.
4. Color-Coded Labels: Using different colored labels for different types of cables or different destinations can make identification quicker and more intuitive.
5. Printed vs Handwritten Labels: If possible, use a label maker for a more professional and durable result. Handwritten labels are more susceptible to fading and smudging over time.
6. Consistent Labeling Format: Keep a consistent format for all your labels. This could be as simple as always writing the information in the same order, using the same abbreviations, or always placing the label on the same part of the cable.
7. Label Protectors: If the environment is particularly harsh, consider using label protectors to cover your labels, enhancing their durability and readability over time.
8. Regular Updates: If the configuration of your antenna system changes, make sure to update the labels to reflect any new routing or connections.
9. Easy-to-Read Text: Ensure the text is large and clear enough to be easily read without having to manipulate the cable too much.
10. Use of Cable Tags: For thicker cables, or where adhesive labels may not stick well, you can use cable tags that loop around the cable.

Remember, the goal of labeling is not just to identify cables during the installation but also to ensure that any future modifications, troubleshooting, or repairs can be done efficiently and accurately.

Regular Maintenance: Periodically check the cables and connectors for damage or corrosion, especially if they are exposed to harsh weather conditions.

Professional Installation for Complex Setups : If your setup is complex or you're unsure, consider hiring a professional to ensure optimal installation and performance.

Always remember to follow the manufacturer's instructions and local building codes. The practices might vary slightly depending on the type of antenna, the building's structure, and local environmental conditions.

IoT (Internet of Things) is a growing network of objects, devices and machines each able to communicate with the other using a wireless network to access the Internet. IoT devices have a flexible range of both wired and wireless connectivity options.  IoT protocols mostly use ISM band frequencies of 4.33GHz, 915MHz, 2.4GHz to 5GHz.

Characteristics of Different Frequency Bands

• Lower Frequencies (e.g., 433 MHz, 868 MHz): Longer range, better penetration, lower data rate.
• Higher Frequencies (e.g., 2.4 GHz, 5 GHz): Shorter range, higher data rates, less penetration.
• mmWave Frequencies (used in 5G): Very high data rates, extremely limited range and penetration.

Common IoT Wireless Technologies and Their Frequency Bands

• Wi-Fi: Primarily uses the 2.4 GHz and 5 GHz bands.
• Bluetooth: Operates in the 2.4 GHz ISM band.
• Zigbee: Also uses the 2.4 GHz ISM band.
• LoRa: Works in various bands including 433 MHz, 868 MHz (Europe), and 915 MHz (North America).
• NB-IoT: Operates in the LTE frequency bands.
• 5G IoT: Utilizes a range from sub-1 GHz to mmWave frequencies.

Short-range IoT wireless devices

• Mostly use Bluetooth and ZigBee. Short-range connectivity is most common in IoT applications.
• Bluetooth antennas operate at the 2.400 to 2.485 GHz frequencies. Uses Ultra High Frequency Radio to exchange data between IoT devices over short distances.
• The range of Bluetooth can be greatly enhanced by antennas.
• Our ZigBee antennas are the same antennas that we designate as "Bluetooth Antennas", because ZigBee uses the same frequency range: 2.400 to 2.484GHz. ZigBee also uses 915 MHz band in the United States. ZigBee bears some similarities to Bluetooth but is simpler and cheaper to operate. A ZigBee antenna can be obtained as a Printed Circuit Board (PCB) antenna or omni directional external antenna with. ZigBee is a wireless personal area network (WPAN) which is characterized by being low-power, low-data rate and operating at close proximity. It does not require line of sight. Transmission distances are typically within 10 to 100m. ZigBee is named after the distinctive movements of honeybees.
• Wired IoT devices use Ethernet, coaxial or power communication cables.

Medium-range IoT wireless:

• For medium range, the LTE Advanced network is almost exclusively preferred for its low latency, high data rates, and extended range. Mid-range variants of WiFi such as HaLow are also used.
• 2G, 3G / GSM, 4G / LTE and 5G wireless, WiFi.

Long-range IoT wireless: LPWAN (Low-power wide-area networking) transmits at low data rates: LPWAN is ideal for long distance IoT transmissions for its economic power consumption and cost of transmission. Long-range satellites such as VSAT transmitting narrowband and broadband are also used.

All the LPWAN protocols, beginning with the three most popular:

• LoRaWAN stands for Long Range, and is a Low Power Wide Area Network (LPWAN) that enables long range transmissions of more than 10km with low energy consumption. LoRa operates at frequencies just under 1 GHz. Directional antennas are most suitable for LoRa antennas, although omni-directional antennas are often used.  LoRaWAN was developed in France and derived from CSS as its first commercial implementation. LoRa exploits the sub-GHz RF bands such as 433MHz, 868MHz and 915MHz to facilitate long range transmission of over 10km with low power consumption, ideal for IoT connectivity.
• LTE-M. Long Term Evolution for Machines permits both voice and data transfer with mobility, low bandwidth and energy consumption.
• NB-IoT:  Narrow Band-Internet of Things(NB-IoT) is a LPWAN developed by 3GPP which provides data transfer at low cost and low energy consumption at a frequency of 200kHz.
• DASH7: A sensor and actuator network protocol developed by the DASH7 Alliance (D7A). It is open source and wireless. DASH7 is able to utilize a range of LPWAN technologies for operation within the license free sub GHz frequencies, relying mainly on 433MHz. 
• Sigfox: The Sigfox protocol was developed in 2009 in Toulouse, France and operates similarly to NB-IOT, as a narrowband LPWAN. It uses unlicensed ISM (industrial, scientific and medical) bands to operate.
• Wize: Wize is an open standard developed and released by the Wize Alliance in 2017. It harnesses the refurbished 169MHz frequency, previously used for pagers but now repurposed for smart utility metering and IoT applications.
• Chirp Spread Spectrum (CSS): This form of digital communication utilizes frequency modulation pulses known as chirps to encode information for transmission. The chirps are frequency modulation pulses. The transmitted signal is spread to occupy the available frequency spectrum.
• Weightless: This form of communication uses open source wireless technology that allows exchange of data between base stations and multiple machines or devices in its vicinity. The connectivity standard Weightless-P has had traction as a bi-directional narrowband network that can operate at both licensed and unlicensed frequencies.
• Telegram Splitting: This license free and standardized LPWAN technology splits a transmitted data packet into numerous smaller portions of data and transmits these sub-packets at different times and sub-GHz frequencies. As less information is transmitted at a time, data transfer is fast, scalable and secure against interference, with ultra-low bandwidth consumption. MIOTY protocol harnesses this technology for large-scale industrial and commercial IoT deployments.
• NB-Fi Protocol: This protocol is license free, operating in the  ISM band. Developed by WAVoT, it is an ultra narrow band (UNB) technology and can achieve transmission distances of up to 30km in rural areas and even underground and low battery consumption lasting up to 10 years.
• Random Phase Multiple Access (RPMA): This wireless technology, previously known as On-Ramp Wireless was developed by Ingenu for IoT and M2M applications. It operates using the 2.4GHz band with a stand-alone broadcast channel and can be deployed globally.
• Ultra Narrow Band (UNB): These LPWANs, delivered are characterized by their extremely narrow and selective bandwidths. Short infrequent transmissions can be delivered over VHF or UHF frequencies for long distance and low energy consumption communication by IoT and other devices. 
• Taggle Byron: This Australian-based venture has developed this radio technology to provide a low cost, low power and long range communications solution. 
• WAVIoT: This LPWAN has been developed specifically with IoT and M2M bi-directional communication in mind. WAVIoT harnesses ISM bands using the NB-Fi protocol for applications such as utility metering.

Factors Affecting Protocol Selection for IoT Applications

When selecting wireless technology for Internet of Things (IoT) applications, the following key factors need to be considered to ensure optimal performance and efficiency:

1. Range: The distance over which the IoT device needs to communicate is crucial. Short-range technologies like Bluetooth and Wi-Fi are suitable for home or office environments, while long-range technologies like LoRaWAN or NB-IoT are better for industrial or agricultural applications where devices are spread out over large areas.
2. Data Rate: Different applications require different data throughput. High-data-rate technologies like Wi-Fi are suitable for applications like video streaming, while low-data-rate technologies like Zigbee or LoRa are sufficient for sensors transmitting small amounts of data.
3. Power Consumption: IoT devices often run on batteries, so power efficiency is a significant consideration. Technologies like Bluetooth Low Energy (BLE) or Zigbee are designed for low power consumption, making them ideal for devices that need to operate for extended periods without recharging.
4. Network Topology: The structure of the network - whether it's point-to-point, star, mesh, or something else - affects the choice of technology. Mesh networks are robust and self-healing, ideal for smart home applications, and can be implemented with technologies like Zigbee.
5. Security: Security needs vary depending on the application. Technologies like Wi-Fi offer advanced security protocols, which are crucial for applications handling sensitive data.
6. Cost: The cost of implementing and maintaining the technology is always a consideration. Some technologies require more expensive hardware or have higher operational costs due to power consumption or network fees.
7. Interference and Reliability: In environments with many wireless devices or heavy machinery, interference can be a significant issue. Selecting a technology that operates on a less crowded frequency band or one that has robust interference mitigation techniques can be critical.
8. Scalability: The ability to scale the network as the number of connected devices grows is essential. Some technologies are better suited to small networks, while others can handle thousands or even millions of devices.
9. Regulatory Compliance: Wireless technologies must comply with regional regulations concerning spectrum use. It's important to choose a technology that is legal and optimized for use in the intended geographical area.
10. Latency: The time it takes for data to travel from the source to the destination can be critical in applications like industrial automation where real-time data processing is required.
11. Environmental Factors: The operating environment (indoor/outdoor, urban/rural, temperature extremes, etc.) can greatly affect the performance of wireless technologies.
12. User Requirements and Experience: Consideration of the end-user experience and specific requirements of the application, such as ease of setup and use, can also guide the choice of technology.

About IoT: Devices, antennas, History and Future

• The devices (“Things”) are common everyday devices and equipment, including smartphones, wearables, vehicles, and instruments.
• Each device in the network is uniquely identifiable and able to exchange data with other devices over IP. Devices are embedded with software and connectivity features to enable this communication.

IoT wireless protocols are rapidly developing and as the means for a wide variety of applications which make machines, devices and communications more effective, increase their functionality and enable them to 'speak’ to each other.

The term Internet of Things (IoT) was coined by a MIT academic in 1999, and initially referred to Radio Frequency ID (RFID) technology for devices.

Wireless IoT systems use antennas to transmit or receive information and usually operate in association with wireless routers to improve the signal to and from the device they are connected to. They connect to a processor which can then, depending on how it has been programmed, perform an action with any need for user input.

LTE-M, short for Long-Term Evolution for Machines, is a type of low power wide area network (LPWAN) technology standardized by 3GPP (3rd Generation Partnership Project) for the Internet of Things (IoT) and Machine-to-Machine (M2M) communications. It's part of the broader LTE (4G) technology family but specifically optimized for IoT applications.  It is a form of Narrowband IoT (NB-IoT)

Designed to meet the needs of IoT applications requiring low to medium data rates, low power, and mobility, LTE-M strikes a balance between power efficiency, coverage, data rate, and cost.

LTE-M is a versatile choice for a wide range of IoT applications, especially those requiring mobility or higher data throughput compared to other LPWAN technologies.  All the major mobile network operators and service providers offer LTE-M services.