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A Theoretical Model of Radiation Mechanism of Small Antenna for Improving Reliability of IoT Devices

Research Project

Project/Area Number 21K14158
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 21020:Communication and network engineering-related
Research InstitutionMaebashi Institute of Technology

Principal Investigator

Keisuke Fujita  前橋工科大学, 工学部, 助教 (90804857)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords小形アンテナ / IoT / 複共振 / 広帯域 / 帯域幅 / 近傍界 / Q値 / 放射効率 / 球ヘリカルアンテナ / アンテナ理論 / 電磁波 / 解析的手法 / 理論モデル
Outline of Research at the Start

IoT機器の小型化のためにはアンテナの大きさを通信に用いる波長に比べて小さくする必要がある.しかし,アンテナを小型化していくと「性能が著しく低下し,近接物体の影響を受けやすくなる」という問題が生じるため,対策が必要である.
本研究では,この問題を解決するため小形アンテナと物体の双方をモデル化し,物体近接によってアンテナが受ける影響に関する理論モデルを構築する.さらに,物体に近接したアンテナがなぜ性能低下し,どのようにすれば性能低下を防げるのかについて解明し検証する.

Outline of Final Research Achievements

In this project, the operating mechanism of small antennas, which are crucial to the advancement of the IoT, was investigated from a theoretical perspective and fabrication. Focus was especially placed on the effect of proximity of the antenna to nearby objects. Using a spherical helix antenna as a theoretical model, we analyzed the effect of proximity to conductors, and found that a parallel arrangement of antennas can achieve multiple resonances and enable broadband operation. In order to achieve both stable broadband and high radiation efficiency, a compact antenna with a new structure was investigated, and its performance was confirmed by measurements.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術及び社会的な意義は以下のように2つに分けられる.第一に,IoT技術への貢献である.この結果を用いることによって,これまで搭載可能でなかった機器への搭載が可能になる基盤を与えることができた.第二に,小形アンテナ動作の理論的な解明である.ここで得られた結果はアンテナの形状を工夫することによって高性能が得られる可能性を示唆しており,今後の高性能化に寄与する基礎的な結果が得られた.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (20 results)

All 2023 2022 2021

All Journal Article (10 results) (of which Peer Reviewed: 9 results) Presentation (10 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results)

  • [Journal Article] Bandwidth Enhancement of a Spherical Helix Antenna with Multi-Mode Excitation2023

    • Author(s)
      島田 拓馬,西江 美奈,野口 啓介,小田垣 雅人,藤田 佳祐
    • Journal Title

      電子情報通信学会論文誌B 通信

      Volume: J106-B Issue: 11 Pages: 696-704

    • DOI

      10.14923/transcomj.2023APP0001

    • ISSN
      1881-0209
    • Year and Date
      2023-11-01
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Closed-Form Expression of Radiation Characteristics for Electrically Small Spherical Helix Antennas2023

    • Author(s)
      Keisuke FUJITA , Keisuke NOGUCHI
    • Journal Title

      IEICE Transactions on Communications

      Volume: E106.B Issue: 5 Pages: 459-469

    • DOI

      10.1587/transcom.2022EBP3094

    • ISSN
      0916-8516, 1745-1345
    • Year and Date
      2023-05-01
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Analysis on the Electric Near-field of Small Spherical Helix Antennas by Using the Spherical Wave Expansion of the Novel Thin-wire Model2023

    • Author(s)
      藤田 佳祐、野口 啓介
    • Journal Title

      電子情報通信学会論文誌B 通信

      Volume: J106-B Issue: 3 Pages: 146-156

    • DOI

      10.14923/transcomj.2022GWP0005

    • ISSN
      1881-0209
    • Year and Date
      2023-03-01
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Wideband Spherical Helix Antenna with Multi-mode Excitation2023

    • Author(s)
      Shimada Takuma, Nishie Mina, Noguchi Keisuke, Fujita Keisuke
    • Journal Title

      Proc. of 2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)

      Volume: - Pages: 1-3

    • DOI

      10.23919/ursigass57860.2023.10265332

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Modal Current Distribution for Electrically Small Spherical Helix Antenna2023

    • Author(s)
      Keisuke Fujita
    • Journal Title

      Proc. of IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (IEEE APWC)

      Volume: - Pages: 007-007

    • DOI

      10.1109/apwc57320.2023.10297485

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Significance of the Higher-order Modes to the Near-field Calculation of the Spherical Helix Antennas2022

    • Author(s)
      Keisuke FUJITA
    • Journal Title

      Proc. of 2022 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)

      Volume: - Pages: 048-048

    • DOI

      10.1109/apwc49427.2022.9899885

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Calculation of Q Factor for Spherical Helix Antennas2022

    • Author(s)
      Keisuke FUJITA, Takuma SHIMADA
    • Journal Title

      Proc. of 2022 URSI-Japan Radio Science Meeting (URSI-JRSM 2022)

      Volume: -

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Analysis on Near Field of Spherical Helix Antennas with Vector Spherical Harmonics2022

    • Author(s)
      Keisuke FUJITA
    • Journal Title

      Proc. of 3rd URSI Atlantic Radio Science Conference (URSI AT-AP-RASC)

      Volume: -

    • Related Report
      2022 Research-status Report
  • [Journal Article] Radiation Efficiency Estimation for Spherical Helix Antennas2021

    • Author(s)
      K. Fujita
    • Journal Title

      Proc. of General Assembly and Scientific Symposium of the International Union of Radio Science

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] A simplified expression on the radiation characteristics of small spherical helix antennas2021

    • Author(s)
      K. Fujita
    • Journal Title

      Proc. of IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] 小形・複共振アンテナにおける電界強度の周波数特性2023

    • Author(s)
      島田 拓馬,西江 美奈,野口 啓介,小田垣 雅人,藤田 佳祐
    • Organizer
      2024年電子情報通信学会総合大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 装着者の災害状況が把握できるセンサ用小形アンテナの製作2023

    • Author(s)
      渡辺泰斗,藤田佳祐
    • Organizer
      電気学会東京支部栃木・群馬支所合同研究発表会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 交差 2線式球ヘリカルアンテナに関する基礎検討2023

    • Author(s)
      島田拓馬,西江美奈,野口啓介,藤田佳祐
    • Organizer
      2023年電子情報通信学会総合大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Significance of the higher‐order modes to the near‐field calculation of the spherical helix antennas2022

    • Author(s)
      Keisuke Fujita
    • Organizer
      IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (IEEE-APWC 2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Calculation of Q Factor for Spherical Helix Antennas2022

    • Author(s)
      Keisuke FUJITA, Takuma SHIMADA
    • Organizer
      2022 URSI-Japan Radio Science Meeting (URSI-JRSM 2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Analysis on Near Field of Spherical Helix Antennas with Vector Spherical Harmonics2022

    • Author(s)
      Keisuke Fujita
    • Organizer
      3rd URSI Atlantic Radio Science Conference (URSI AT-AP-RASC)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Radiation Efficiency Estimation for Spherical Helix Antennas2021

    • Author(s)
      K. Fujita
    • Organizer
      General Assembly and Scientific Symposium of the International Union of Radio Science
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] A simplified expression on the radiation characteristics of small spherical helix antennas2021

    • Author(s)
      K. Fujita
    • Organizer
      IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] IoT機器応用を目指した球及び円筒ヘリカルアンテナへの理論的アプローチ2021

    • Author(s)
      藤田佳祐
    • Organizer
      URSI-C委員会 第25期 第1回公開研究会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 小形球ヘリカルアンテナの簡易な給電構造モデル2021

    • Author(s)
      藤田 佳祐,野口 啓介
    • Organizer
      電子情報通信学会 ソサイエティ大会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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