4.7 Article

Design of Perfect Absorber Based on Metagratings: Theory and Experiment

期刊

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 71, 期 2, 页码 1832-1842

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2022.3233472

关键词

Absorption; Impedance; Electric fields; Diffraction; Substrates; Bandwidth; Metamaterials; Analytical design; metagratings (MGs); perfect absorber (PA)

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This article proposes an analytical design methodology for different kinds of perfect absorbers (PAs) based on metagratings (MGs). By choosing the period of the MG to ensure only the 0th order diffraction mode, the specific load impedance density is controlled to achieve destructive interference of specular reflection and 0th mode diffraction, thereby realizing perfect wave absorption.
This article proposes an analytical design methodology for different kinds of perfect absorbers (PAs) based on metagratings (MGs). In the specific analysis and design, the period of the MG is chosen to ensure that there is only the 0(th) order diffraction mode. Using the established theory, the supercell of the MG is rigorously analyzed to derive a specific load impedance density expression that allows achieving destructive interference of specular reflection of the substrate and 0(th) mode diffraction such that perfect wave absorption is realized. Four kinds of PAs composed of different supercells of MG with different bandwidths are systematically analyzed, designed, simulated, and experimentally verified. The simulation and measurement results are in good agreement and consistent with the theoretical analysis, showing the validity of the provided theory and technique for electromagnetic wave absorption.

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