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    Application of AF antenna coefficient

     

    What is antenna antenna coefficient? The antenna coefficient (AF) of the antenna is a comparison between the field level displayed by the antenna and the actual voltage generated at the antenna at its connector. This can be seen in the figure below. Note that the antenna coefficient varies with the frequency, that is, for the same field strength, but at different frequencies, the voltage generated by the receiver is not constant. AF data Through a further description, an antenna generates AF data is not particularly accurate but simple method is to illuminate it at a particular frequency, and use a receiver to measure the voltage generated at the antenna connector. In this example, it is not particularly accurate because we will create known field strengths on an antenna frequency range (with equal interval frequency coverage) using the RF list used in the immunity system (eg 10V / m). Then use the antenna discussed to replace the field probe, step by step through the point frequency, and measured and record the voltage at the antenna connector. Use AF data Antenna supplier provides more precise AF data in chart. This data is entered into the EMC software, so the antenna coefficient can be added to the input cable loss or the like. All data entered into the software is in db. Then, the field levels issued by the EUT can then be determined by using the voltage reading on the receiver and the simple algebra of the input data. That is, the voltage read of DBUV is added to the AF at this frequency, and the cable loss is added to obtain the actual field measured by the antenna. Source: a.s

     

     

     

     

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