Development of functional periodic structures with frequency selective characteristic and its application to medical electromagnetic environments

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K04623
• 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: Oita University
• Principal Investigator: Kudou Takato 大分大学, 理工学部, 教授 (60225159)
• Co-Investigator(Kenkyū-buntansha): 花田 英輔 佐賀大学, 理工学部, 教授 (90244095)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 周波数選択性 / 電磁波遮へい / 周期構造 / シミュレーション / 医療電磁環境

Outline of Final Research Achievements

We researched band-selective electromagnetic shielding in view of keeping required wireless communications and intercepting undesired electromagnetic waves in medical institutions. We noticed band-gap characteristics of DPS (Dielectric Periodic Structure) and FSS (Frequency Selective Surface), and performed three-dimensional computer simulations concerned with the shielding effect of the structure that combines them in microwave band. We analyzed frequency and spatial characteristics for some kinds of structure parameters and showed two frequency-bands shielding is simultaneously possible. We also identified current problems and proposed improvement guidelines in medical electromagnetic environments regarding the specific use of shielding materials. We included the production of a prototype of the structure and an experiment to evaluate its characteristics in the initial plan, but these were not possible due to COVID-19 pandemic. These are future issues.

Free Research Field

電磁波工学（電磁波諸現象に関する理論解析と数値解析）

Academic Significance and Societal Importance of the Research Achievements

誘電体周期構造とFSS（周波数選択板）を組み合わせた構造体をマイクロ波帯の帯域的遮へい用素材として利用し，それを医療電磁環境に応用するという研究は過去に無かった。本研究において，この構造体により複数の周波数帯域を同時に遮へい可能であることが示され，かつ，構造体の実現に向けての基礎データを取得できたことは，大きな学術的意義をもつ。この成果はパーティション，壁材，採光窓など，建築材料の設計にも寄与すると考えられる。また，電磁環境に起因する医療機器への悪影響防止，医療情報のセキュリティ強化など，在宅を含む安全・安心な医療電磁環境の構築を促進する観点から，社会的にも意義のある研究成果である。