frequency-selective rasorber (FSR)

A dual-passband frequency-selective rasorber (FSR) with high selectivity is proposed in this letter. By analyzing the equivalent circuit model (ECM), the design approach improving the selectivity of the dual-passband is introduced. The FSR is formed by a lossy layer and two frequency-selective surface (FSS) layers. The lossy layer is composed of two parallel resonance units embedded in a rhombic structure, which is connected with fourresistors loaded on the T-shape metal strips.