A global–local design method for wideband absorption/transmission sandwich rasorber with frequency-selective surfaces.

• A global–local design method based on the average absorption/transmission condition (AATC) is proposed. • The equivalent circuit model (ECM) is employed to derive the AATC. • A new structure of the honeycomb-core sandwich rasorber is designed and analyzed. Multi-function composite structures with unique electromagnetic and mechanical performance have attracted increasing interest in the design of airborne radomes. In this study, a novel global–local design method embedded with average absorption/transmission conditions (AATC) is proposed on the basis of the equivalent circuit model (ECM) to investigate the wideband absorption/transmission characteristics of a honeycomb-core sandwich rasorber (HSR) with a dual-polarized resistive sheet and second-order bandpass frequency-selective surfaces (FSS). The structure of the HSR is optimized by adopting the global–local design method combined with the finite element model (FEM). The calculation and simulation results show that the optimized HSR can realize a wide absorption band (3.9–17.9 GHz) and a wide transmission band (9.1–10.9 GHz) simultaneously. Moreover, the absorption/transmission performance of the HSR is independent of the polarizations and incident angles. The effectiveness of the proposed method is validated by the excellent electromagnetic performance of the optimized HSR. [ABSTRACT FROM AUTHOR]