Antenna Range Measurements
نویسنده
چکیده
The antenna range is set up for antenna ratiometry 1 so that two paths are constantly being compared, both originating from a common transmitting antenna. These two paths are called "reference" and "measurement." The reference path uses a fixed antenna that receives what should be a constant level; in reality, there are continuous small fluctuations in received signal at microwave frequencies even over a short distance like an antenna range. Using ratiometry, the reference path allows these random variations in the source power or the path loss to be corrected by an instrument that constantly compares the measurements with this reference path. The other path is for measurement. First, a standard antenna with known gain is measured and the reading recorded. Then when an unknown antenna is measured, the difference between it and the standard antenna determines the gain of the unknown antenna.
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