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This work applies aperture-coupled resonators (ACRs) to realize a high-selectivity frequencyselective surface (FSS) at 60 GHz. In a generic ACR FSS, one or both of electrical and magnetic coupling paths can, theoretically, be constructed by appropriately designing coupling apertures. To investigate the operating principle of the ACR FSS, an equivalent-circuit model is first given and analyzed using the odd-and even-mode method. A novel ACR FSS structure with dominant electrical coupling is then proposed. This FSS consists of two crossed-dipole resonator arrays and one rectangular coupling aperture array in between. The constructed out-ofphase signal paths cause two transmission zeros (TZs) near the skirts of the narrow passband, thereby considerably enhancing the selectivity. Parametric study of the proposed ACR FSS was performed. Benefiting from the symmetric structure and low profile, the proposed FSS exhibits good angular stability and polarization stability. A prototype of the proposed ACR FSS at 60 GHz was fabricated and characterized experimentally. The measured results agree well with the full-wave and circuit simulated results, thus verifying the FSS design. IndexTerms-Aperture-coupled resonators (ACRs), frequency-selective surface (FSS), high selectivity, narrow passband, transmission zero (TZ), V-band (60 GHz).

A compact frequency selective surface (FSS) for 5G applications has been designed based on 2.5-dimensional Jerusalem cross. The proposed element consists of two main parts: the successive segments of the metal traces placed alternately on the two surfaces of the substrate and the vertical vias connecting traces. Compared with previous published two-dimensional miniaturized elements, the transmission curves indicate a significant size reduction (1/26 wavelengths at the resonant frequency) and exhibit good angular and polarization stabilities. Furthermore, a general equivalent circuit model is established to provide direct physical insight into the operating principle of this FSS. A prototype of the proposed FSS has been fabricated and measured, and the results validate this design.