期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 65, 期 11, 页码 5886-5894出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2017.2748226
关键词
Absorber; broadband; frequency-dispersive magnetic material (FDMM); frequency-selective surface (FSS); ultrathin
The bandwidth of frequency-selective surface (FSS)-based absorber decreases when high permittivity material is used to reduce the thickness of the absorber. A solution of this thickness-bandwidth dilemma was presented by using resistive FSS layer and frequency-dispersive magnetic material (FDMM) in substrate. The FDMM was designed for a certain profile of complex permeability, and the FDMM substrate has both high permeability and permittivity for thickness reduction and near frequency-nondispersive input susceptance for bandwidth expanding at low frequencies. A 2.3 mm thick FSS-based FDMM absorber was designed and fabricated, which achieved a broad absorption band of 4-15 GHz (3.75:1) with -10 dB reflectivity. In terms of the same bandwidth ratio, the thickness of FSS-based FDMM absorber is only 0.031 lambda(L) against the thickness of 0.114 lambda(L) of conventional FSS-based absorber.
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