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Problem in getting good cross polarization performance in corrugated horn antenna

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Anuj_Modi

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I am not getting good cross polarization performance in corrugated horn antenna. Means I am getting good return loss, 96% power goes into fundamental mode (TE11) but not getting low value of cross polarization.
My co-polarization gain is 20 dB and cross polarization gain is 6 dB. But the reference paper which is I am following right now they are having almost 50 dB difference between co polarization and cross polarization gain.
 

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