08 September 2023 1 2K Report

I know AMC resonant frequency at phase 0 ! I read many paper, some AMC S11 are near 0 dB some are below -10 dB. I want to know which is correct ?

My point of view is near 0 dB, because AMC is for reflecting the wave in phase. That the reason why antenna gain rise !

Is AMC only for gain increasing ?

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