Polarization‐insensitive frequency selective rasorber with broad absorption band and two‐sided transmission bands

Abstract

In this study, a compact and polarization-insensitive frequency selective rasorber (FSR) is proposed with dual transmission bands located at the two sides of a broad absorption band. The proposed FSR is a two-layer structure designed by combining the Jerusalem cross based dual bandpass frequency selective surface (FSS) with a broadband resistive square loop absorber, such that both the absorption and transmission characteristics are retained. The proposed FSR has a thickness and size of 0.09λ L and 0.026λ L 2 , respectively at the lowest frequency of À10 dB reflection (1.97 GHz). The dual transmission bands are obtained at 2.1 and 8.8 GHz with an in-between absorption band ranging from 3.6 to 7.4 GHz (69.09%). The working principle of the proposed FSR is analyzed using an equivalent circuit model. Furthermore, a range of lower and upper transmission bands with respect to the absorption band is determined by carrying out the parametric studies on the geometrical parameters of the bandpass FSS. A prototype of the proposed FSR consisting of an array of 10 Â 10 unit cells is fabricated and the results are experimentally verified.

Miniaturized Design of Dual Transmission Frequency Selective Rasorber With Wide Angular Stability

“…However, with increasing demand of dual/multi-band radiating systems in the communication systems [23], the need for dual/multi transmitting rasorber is of significant requirement. In recent years, studies on designs of dual-band rasorbers with T-A-T [24], A-T-A-T [25]− [28], and A-T-A-T-A [29]− [32] have gained significant importance.…”