A Broadband Dielectric Microwave Absorber With Periodic Metallizations

Abstract

An efficient technique is proposed to absorb microwave. This new kind of microwave absorber consists of a 2D-periodic array of metallic patches and a lossy dielectric layer backed by a metallic plate. In this paper, we study configurations involving dielectric stacks and arrays of metallic patches which produce broadband absorbers. Combining lossy dielectric stacks and 2D-periodic array of metallic patches transforms well-known Dällenbach screens into broadband absorbers. In this paper we discuss the method used to predict the reflection coefficient of the structure. This method is based on Floquet's Theorem and Galerkin method. We also present measurements of the electromagnetic wave reflected by this radar absorbing structure, and compare the results to the numerical prediction. The last part of the paper deals with an original discussion about the numerical precision of our efficient computation using stochastic algebra.