A Dual-polarization Frequency Selective Rasorber with Wideband Absorption

This work introduces a wideband frequency selective rasorber (FSR) with dual polarization. A lossy layer is cascaded atop a bandpass layer with lossless hexagonal apertures to create the rasorber. The lossy layer is composed of triaxial symmetric unit which can provide a transmission window at the frequency where one side of the structure is approximately λ/4 long. From the simulation results,a passband with a center frequency of 5.82GHz and a minimum insertion loss of roughly 0.54dB of the rasober is obtained. At 2.2-3.4GHz and 7.1-14GHz, respectively, two absorption bands with absorption rates > 80% are attained. The thickness of the array is around 0.06λ
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and the unit cells are aligned using an equilateral triangle arrangement to improve the angular stability.