Abstract:
This letter presents a novel broadband single-lossy-single-lossless-layer frequency selective rasorber (FSR) with high passband selectivity, facilitated by an enhanced eq...Show MoreMetadata
Abstract:
This letter presents a novel broadband single-lossy-single-lossless-layer frequency selective rasorber (FSR) with high passband selectivity, facilitated by an enhanced equivalent circuit model (ECM). Leveraging the ECM method for an FSR by substituting typical LC resonant circuits with mixed series-parallel LCL resonant circuits for both the lossy and lossless FSSs, significantly enhances the passband selectivity. The intentionally introduced inductance in the lossy FSS sharpens the passband roll-off, while in the lossless FSS creates an additional transmission zero, further improving selectivity. Simulations reveal a -3 dB passband of 10.04 GHz to 10.56 GHz, with a minimum insertion loss of 0.48 dB at 10.28 GHz. The proposed FSR achieves a 139.4% fractional bandwidth, spanning from 3.61 GHz to 20.22 GHz, and maintains stable performance for both TE and TM polarizations across a wide incidence up to 55°. The agreement between simulation and measurement confirms the practical application potential of the FSR design.
Published in: IEEE Antennas and Wireless Propagation Letters ( Early Access )