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Data Alliance Antennas Signal Loss in Antenna Cables.  LMR-100, LMR-200, LMR-400

Tech Support - Antennas

    Maximum Input Power Rating of Antennas

    Maximum Input Power is defined as: The maximum amount of power (voltage given in Watts) that is able to be transmitted to a single antenna without damage to the antenna port from overloading.

    Maximum Input Power is a key parameter commonly seen on antenna specifications and datasheets. It may be termed ‘power handling’ or designated as ‘Max. Power (total)’ or ‘Max. Input Power’.

    It is typically designated ‘per port’ to differentiate the values for single antennas from ratings for multiport or ‘multiple input, multiple output’ (MIMO) antennas.

    Why It Is important to Know the Maximum Input Power Rating of an Antenna

    If you are evaluating the efficacy or performance of a particular antenna, Maximum Input Power indicates an antenna’s ability to tolerate the power applied and perform at a given voltage rating.

    This power handling capability is also influenced by the radio frequency (RF) output of the antenna; the capacity of a particular antenna to convert the power supplied into RF energy and informs the optimum electrical field that can be obtained without degrading the unit.

    Maximum Input Power also informs the proper use of this electronic equipment and prevents the safety of the unit from being compromised. It is important to note that surplus power supplied to the antenna will also be discharged as heat and therefore overvoltage can pose a fire risk.

    Typically antennas are able to withstand voltages far higher than the Maximum Input Power ratings supplied by manufacturers. These more conservative, published ratings afford an implied guarantee of functionality at the specified voltage. Applying higher power input may alter the performance of the antenna and invalidate its specification.

    How Maximum Input Power Is Tested

    Maximum Input Power is tested as part of the electrical engineering of the antenna and its components. Component datasheets and non-destructive testing methods may be used to determine the overall voltage rating a specific antenna.

    A number of international bodies provide reporting specifications and input power standards for antennas including BASTA, a body which oversees base station antenna standards and GS1 a global communications standards body. Maximum Output Power of antennas is restricted or specified in many countries which will therefore determine the marketed Maximum Input Power of antennas within their domestic markets.

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    Antenna Beamwidth

    Beamwidth is the angle from which the majority of the antenna’s power, as illustrated on the radiation pattern's main lobe, radiates. It may be measured in the horizontal or vertical planes and is the distance between two points where the power is less than half of the maximum.Beamwidth varies with the physical and electronic characteristics of [...]

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    Antenna Polarization: Vertical, Linear: Key Factor in Selection of an Antenna

    Polarity is a key electrical characteristic to be considered when selecting an antenna. Like-matched antennas in an RF set-up will have optimal power or signal transfer in point-to-point applications.  Polarity is as important as gain, radiation pattern and VSWR. In transmitting antennas, the polarization of an antenna is the direction of the electromagnetic fields produced by the antenna as energy radiates [...]

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    FPV (First Person View) Antennas for Drones

    FPV (First Person View), are remotely controlled vehicles from a pilot’s or drivers point of view. They include unmanned aerial vehicles such as drones and ground vehicles such as RC cars and land moving equipment. FPV video feed and control signals are transmitted across various frequency bands depending on desired range and application. Most FPV [...]

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    Front to Back Ratio: Directivity of Antenna to Reduce Interference

    Front to Back Ratio Applies to Directional Antennas OnlyFront to Back Ratio Defined and Explained:  The measure of directivity of a directional antenna:  It is dependent on the directivity of the antenna with the measurements taken on a 180 degree axis and measured in decibels (dB).A ratio of the magnitude of directional radiation in an antenna, directed [...]

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    45-degree Slant Antenna Polarization Overcomes Interference and Issue w/ Dual-Polarization

    Signals received at base station antennas are typically elliptically polarized in a way more like vertical polarization than horizontal polarization. This creates a common problem with dual polarized base station antennas (like the first generation of Ubiquiti dual-polarity antennas) since the vertically polarized antenna element generally maintains a stronger receive signal than the horizontally polarized [...]

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    VSWR: Impedance Matching in Antennas & Antenna Cables

    Voltage Standing Wave Ratio (V.S.W.R.) is a key Indicator of antenna performance (along with gain / dBi):  The lower the VSWR, the more efficient the antenna. VSWR is a measure of the efficiency of transfer of RF power from its source into an antenna (which may include transmission of RF power along an antenna cable, adapter, and connectors).VSWR and [...]

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    dBi, dB, dBm dB(mW): Defined, Explained and Differentiated

    dBi  = dB(isotropic): The forward gain of an antenna, nmeasured in decibels (dBi),  The dBi value reflects the antenna's directional / beamwidth characteristics, i.e., directional as opposed to omnidirectional:  Generally, the hIgher the gain (dBi), the narrower the beamwidth - the more directional the antenna.   The dBi value also reflects the antenna's electrical efficiency, differentiating [...]

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    Operate 2 Antennas from One Radio: Use a "Power Divider" or "Antenna Combiner" - NOT a T-adapter

    Do not use a "T connection" to get one AP to service two antennas: This causes many problems, further described below.  By "T connection," we mean T-adapter (see photo below) to combine two antennas onto the same antenna cable. A "T" is the incorrect way to split to antennas or transmitters. It results in a 2:1 [...]

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    If Antenna frequency band exceeds needed range: Use Filter on system board to reduce excess band

    Example: You need only 860-960 MHz GSM band but the antenna covers 800-960MHz: One customer told us that using an antenna that includes 824-960 band allows too much interference, that comes from the low end of that band 824-860MHz.Our recommended solution is to add a filter in your system board (or AP [...]

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    Dimensions / Measurements of RP-SMA connectors Signal-loss (attenuation) in LMR-100 and LMR-200 cables RP-SMA antenna BNC cables RP-TNC cables and adapters Roof Mounts for Antennas
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