Development of Advanced Metamaterial Radio Wave Absorber

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04535
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21060:Electron device and electronic equipment-related
• Research Institution: Aoyama Gakuin University
• Principal Investigator: Suga Ryosuke 青山学院大学, 理工学部, 准教授 (20398572)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: マイクロ波 / 電波吸収体 / 周期構造 / 偏波 / 入射角度 / 帯域幅

Outline of Final Research Achievements

In this study, the bandwidth design of a metamaterial radio wave absorber was investigated. The absorber with the center frequency of 5 GHz and -15 dB fractional bandwidth of 250 MHz was designed and its feasibility was indicated. The theoretical limit of the maximum bandwidth for a two-layered absorber was also clarified.
A method for estimating the S-parameters for both polarizations and all incident angles was proposed. It was found that the impedances of four incident angles are need to estimate the S-parameters. The estimated reflection coefficients and polarization conversion coefficients agreed with those of the electromagnetic field analysis within 0.1 and the effectiveness of the proposed method was indicated.

Free Research Field

マイクロ波・ミリ波工学

Academic Significance and Societal Importance of the Research Achievements

従来より金属エレメントを周期的に配列した電波吸収体や反射板の研究例が多く報告されており，特に近年では，5Gシステムにおける通信エリア拡大に向けて，メタマテリアル吸収体や反射板に関する期待が高まっている．しかし，これらのデバイスの全ての入射角に対するバイスタティックレーダークロスセクションの測定もしくは数値解析には，一般的は非常に高価な測定もしくは解析装置が必要であったり，非常に多くの時間を要する．本研究において開発した推定手法は電波吸収体に限らず，上記の反射板にも適用可能であり，多くの周期構造平面デバイスの開発に寄与するものと考えられる．