Bandwidth enhancement of Salisbury screen microwave absorber using wire metamaterial

Abstract

A new design approach that enhances the bandwidth of conventional Salisbury Screen (SS) microwave absorber is investigated. The absorber comprises of, wire metamaterial printed on FR4 substrate, placed on the top of the SS. The SS consists of 50 Ω/sq resistive sheet placed on the metal backed dielectric spacer. The theoretical analysis indicates the bandwidth of SS for −10 dB reflection is 41.1% using FR4 as a spacer for the optimum sheet resistivity of 308 Ω/sq. The proposed absorber shows the bandwidth of 53.5% (8.9–15.4 GHz) for −10 dB reflection. The thickness of the absorber is 0.15 λL (lowest cut‐off frequency for −10 dB reflection). The FR4 substrate with SS works as Jaumann configuration and introduces an additional resonance mode. The selective overlapping of resonant mode excited by wire metamaterial and the additional resonance mode enhances the bandwidth of the absorber. The wire metamaterial is physically realized using low‐cost screen printing technique. The good agreement between the simulated and measured data has been observed.

A Flexible Foldable Broadband Metamaterial Absorber Fabricated by Intaglio Printing Technology

“…Metamaterial absorber (MA) consists of a periodically arranged metal pattern resonance layer, an intermediate dielectric layer, and a continuous metal backplane. Because most of the MAs at this stage usually choose FR4 or Rogers series plate and other hard substrates [39][40][41], there are shortcomings such as not being thin, not flexible, not folding, and not conformal with the protection target, which limit the practical application scenarios of MA. Although there are metamaterial absorbers * Corresponding author: Huan Lu (luhuan123@zju.edu.cn).…”

Design and Characterization of Square Patch Salisbury Screen Microwave Absorber

“…The reported literature suggests that by introducing additional resonance modes lead to the bandwidth improvement viz. square patch based absorber and SSMA with wire metamaterial [7,8].…”