A single-layer metamaterial-based polarizer and bandpass frequency selective surface with an adjacent transmission zero

In this article, a high order bandpass miniaturized-element frequency selective surface (MEFSS) and a wire-grid polarizer are implemented on a single-layer substrate. This compact spatial filter and polarizer are designed to be incorporated in a 26 GHz UWB rangefinder radar. The spatial filter has a passband at 26 GHz and a transmission zero at 13 GHz. A new single-face miniaturized-element FSS has been proposed to produce the desired frequency response. An accurate circuit model has been developed for this structure to facilitate the filter synthesis process. The structure has been analyzed and optimized with a full-wave EM solver. A prototype of the designed structure has been fabricated and tested. Measurement results show low insertion loss in the passband (<;0.5 dB) and high rejection at transmission zero (>;20dB).