A Miniaturized Frequency-Selective Rasorber With Absorption Bands on Two Sides of Passband for Antenna Dome

A miniaturized frequency-selective rasorber (FSR) with absorption bands on two sides of the passband is proposed in this letter. The FSR consists of one lossy frequency-selective surface (FSS) layer and one lossless FSS layer, and the equivalent circuit model of FSR is also analyzed. The lossy layer is composed of four electric-field-coupled (ELC) resonators loaded with four resistors, and the lossless layer comprises a square slot structure. By embedding the ELC resonators into the square ring, a passband can be added betweven the absorption bands, and the size of the overall structure can be reduced. Under normal incidence, the −10 dB absorption band is from 4.28 to 8.98 GHz and from 11.19 to 13.77 GHz. The transmission operates at 10 GHz and has a small insertion loss with 0.25 dB. Furthermore, an FSR prototype was fabricated and measured. The measured results are consistent with the simulation ones. The proposed FSR can be applied to radar radome to enhance the anti-interference and stealth performances.