Abstract
AbstractA wideband second‐order bandpass frequency selective surface (FSS), which is composed of three metallic arrays and two dielectric substrate layers, is proposed in this paper. The proposed design has high selectivity and wide passband properties simultaneously and is insensitive to incident angles and different polarizations. The equivalent circuit method and field distribution are analyzed to explain the mechanism of the proposed design. A prototype is fabricated and measured, demonstrating a well wideband second‐order passband ranging from 4.8 to 8.8 GHz with 58.8% bandwidth (−3 dB), and the insertion loss (IL) in‐band is less than 0.4 dB. Meanwhile, the transitional bands at both sides of the passband are 0.64 GHz (9.4%) and 0.6 GHz (8.8%), respectively. Moreover, the frequency responses of the proposed structure are stable up to 60° for both TE and TM polarizations.
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