Study, Design and Analysis of U-Shaped Metamaterial Absorber for X-Band Application

Abstract

Electromagnetic microwave absorber is one of the major applications of metamaterials where effective permittivity and permeability can be modified to minimize both transmittance and reflectance at resonant frequency to obtain high absorption through resistive and dielectric loss. Metamaterial absorber can be made ultrathin and highly absorptive ranging from microwave to optical frequency regime. They have proven their potential in comparison to alternate conventional absorbers due to their ultrathinness, near unity absorption properties, simple manufacturing procedures and increasing effectiveness. This paper presents the design, development and working of a novel ultra-wide band, ultrathin metamaterial absorber. The proposed structure is based on simple U-shaped metamaterial printed on a metal-backed dielectric substrate. The numerical simulation carried out in HFSS shows that the proposed design behaves as quad-band EM absorber in X-band. Further, this design has been tested under different angles of incidence. The results gave an affirmation that the proposed design is valid as an absorber for a wide range of incident angles for both TE and TM polarization. The designed absorber can be used for many potential applications like cavity resonance reduction, near field absorbers, loads, anechoic chambers, bolometer, image sensing and processing.

Keywords: Metamaterial, Absorber, Quad-band