Antenna Measurement: Horns, Frequency, & Gain Modeling

AI Thread Summary
Two horn antennas operating between 800 MHz and 2.5 GHz are experiencing a ringing effect during gain measurements, which varies with the distance between them. This phenomenon may be related to multipath effects caused by reflections between the antennas. A Fourier series could potentially model these reflections and their impact on the measurements. The discussion emphasizes the need for a mathematical approach to understand the ringing effect better. Overall, modeling this effect could enhance the accuracy of gain measurements in antenna setups.
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I have 2 horn antennas facing each other each has a size A & B respectively they operate at a frequency 800MHz to 2.5 GHz. they are a distance D apart. when making gain measurments there is a ringing effect which changes as the horns are moved futher or closer apart. Does anyone know if this effect can be modeled as a Fourier series
 
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A Fourier series of what? Sounds like multipath...
 
antenna

the Fourier series would model the effect of the reflections between to the horns.
 

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