A Dual-Band Frequency Selective Rasorber Design

Abstract

A new dual-band frequency-selective rasorber is proposed in this paper. The structure is extended from single-band frequency-selective rasorber. The lossy layer uses lumped element capacitors and inductors, and the lossless layer uses ring slot dual-pass band frequency selective surface unit structure. The simulation results show that the structure has two passbands with resonance points of 3.9 GHz and 6.4 GHz, corresponding to − 0.0383 dB and −0.4816 dB. There are three absorption bands on both sides of the passband. The absorpted bands are 2.17 GHz∼2.6 GHz, 4.89 GHz∼5.9 GHz and 8.28 GHz∼9.1 GHz respectively. The bandwidth is 0.43 GHz, 1.02 GHz and 0.82 GHz, respectively. The absorption rate is 70% below 40 degrees, and the angle stability is good. The structure is of great significance to the study of multiband extension.