Design of High-Order Dual-Band Bandpass Frequency Selective Surface

In this paper, a high-order dual-band bandpass frequency selective surface (FSS) is proposed. A cascade technique is adopted to design of the unit, which consists of the top and bottom layers of annular aperture arrays and the middle cross-patch layer. The simulated results show that two operation passbands for TE polarization, separately in the center frequency of 6.02 GHz and 13.02 GHz. In the second band, a third-order bandpass filtering characteristic response is achieved.