Multi-band Metasurface Microwave Absorber Based on Square Split-Ring Resonator Structure

Abstract

A multi-band microwave metasurface (MS) absorber based on the square split-ring resonators (SSRR) is designed and analyzed. The proposed MS structure comprising of two metallic layers followed by two FR4 materials, and an air gap to separate the dielectric layers. In the bottom layer, a full copper layer is placed to prevent back-wave transient. The performance of the proposed MS absorber is investigated using CST Microwave Studio, and the simulated results show that it can achieve absorption peaks at 1 GHz, 2.4 GHz, 5.7 GHz, and 6.7 GHz with the absorption of 98%, 99.6%, 99.7%, and 99%, respectively, under normal incidence. In oblique incidence, the absorption response values of more than 95% are observed for all the operating frequencies at different incident angles. In addition, the E-field and current distributions are analyzed to illustrate the proposed MS absorber's physical absorption mechanism.

Design and Analysis of Polarization-Independent, Wide-Angle, Broadband Metasurface Absorber Using Resistor-Loaded Split-Ring Resonators

“…The MMA can be formed by an ensemble of periodic subwavelength resonating unit cells with impedance matching that of the free space. Such properties of MPA prompted researchers to use it in a variety of applications, including undesired frequency absorption [9], energy harvesting [10][11][12], sensing, and optics [13,14]. The MPA prefers to be polarization-independent, broadband, and has wide-angle reception in addition to achieving a near-unity absorption.…”

“…Electronics 2022, 11,1986 2 of 15 However, MMA has a limited bandwidth due to its resonating characteristic. The MMA can be designed through a variety of approaches to enhance its bandwidth using multilayer structure [15,16] and resistor film [17,18].…”