Design of a multilayer ultra-wideband absorber based on hybrid absorption structure

A multilayer, ultra-wideband absorber is proposed in this paper, which consists of a hybrid circuit analog absorber and a metal resonant absorber. The circuit analog absorber is located at the upper part of the absorber to absorb low-frequency electromagnetic waves, and the metal resonant absorber is located at the bottom of the absorber to absorb high-frequency electromagnetic waves and provide a reflecting plate for the absorber. Through simulation, the absorption rate of the designed absorber can be greater than 90% in the range of 2.33-18.43 GHz, and an equivalent circuit is established for verification. In addition, the absorber has good angular stability and polarization insensitivity. The prototype of the absorber was manufactured and measured, and the test results are basically consistent with the analysis results.