A Ka-band Frequency Selective Surface Based On Double-Opening Coupling Ring

In this paper, a novel aperture-coupled resonators (ACRs) frequency selective surface (FSS) based on double-opening coupling loop is proposed at Ka-band. In a generic ACR FSS, the electrical and magnetic coupling paths can be obtained by properly designing coupling apertures. This FSS consists of a pair of two double-opining coupling loop arrays and one rectangular coupling aperture array in between. Two transmission zeros (TZs) caused by coupling apertures are next to the narrow passband enhancing frequency selectivity observably. Benefiting from the symmetric structure, the proposed FSS exhibits good angular stability and polarization stability. Furthermore, the proposed FSS has the important advantage of miniaturization.