Antenna measurment (1 Viewer)

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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 modelled as a fourier series
 

berkeman

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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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