Abstract
Most of the previous circuit analog (CA) absorbers only consider the normal incidence. In this paper, a novel wideband absorber consisting of two dimensional array of conductive crossed dipoles with lumped resistors and a well-designed dielectric, working as the wide-angle impedance matching (WAIM) layer, is presented. Results show that the absorption under oblique transverse electrical (TE) incidence can be markedly improved due to the WAIM layer. Equivalent circuit (EC) and strict formula derivation are proposed to make the design more clear and straightforward. Evolutionary algorithm, to be specific, the differential evolution, is used to speed up the optimization process. The final results obtained by EC and simulation software show that the absorber offers the 10-dB reflection reduction bandwidth of at least 109.6%(2.6-8.9 GHz) when the angle of TE incidence is less than 60 degrees.
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