A compact frequency selective surface (FSS) with ultra-wideband bandpass response is presented. Its -3-dB bandwidth is from 5.85 to 18.45-GHz and the unit periodicity is about -0/9 for the lower passband. Moreover, such a FSS has the merits of low profile, flat passband and stable performance for various incident angles within 30° and different polarisations. The design procedure and measurement results of the FSS are presented and discussed.
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