Realization of an extremely small high performance antenna using origami structure

• Project/Area Number: 18K13760
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21020:Communication and network engineering-related
• Research Institution: Maebashi Institute of Technology (2019-2020); Yuge National College of Maritime Technology (2018)
• Principal Investigator: Fujita Keisuke 前橋工科大学, 工学部, 助教 (90804857)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 小形アンテナ / 放射効率 / Q値 / 理論限界 / アンテナ理論 / 折りたたみアンテナ / 折りたたみ / 折り畳みアンテナ / 小型アンテナ / 球ヘリカルアンテナ / 折り畳み

Outline of Final Research Achievements

The aim of this research is to find a novel structure of small antenna which achieve both high performance and small size. The proposed structure is a helical antenna supported by Origami-like folding structure. We proposed and fabricated an antenna whose current distribution can approximate the theoretically optimal result. The antenna was fabricated by a wire conductor.
We analyzed the proposed antenna when the folding mechanism is unfolded. The results were explained by the theory developed in this research and verified by numerical simulation and measurements.

Academic Significance and Societal Importance of the Research Achievements

学術的意義：従来見過ごされてきた立体的なアンテナの折り畳みに注目することで，小型化と高効率を両立する従来にない超小形アンテナの実現可能性を解明することができた．
社会的意義：災害救助用のビーコン用アンテナなど，サイズの制限が厳しい中で少しでも強い電波を送り届けることに応用可能な折り畳みアンテナの提案と理論の定式化を行うことができた．さらに，とその結果の検証を行うことで将来の応用の可能性を高めることができた．

Research Products

• [Journal Article] High Efficiency Compact Cylindrical Helix Antenna (2020)
  • 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: J103-B Issue: 11 Pages: 528-537
  • DOI: 10.14923/transcomj.2020APP0003
  • ISSN: 1881-0209
  • Year and Date: 2020-11-01
  • Peer Reviewed
• [Journal Article] Effective Q factor formula for small spherical surface antennas (2020)
  • Author(s): Fujita Keisuke
  • Journal Title: IEICE Communications Express Volume: 9 Issue: 4 Pages: 111-116
  • DOI: 10.1587/comex.2019XBL0158
  • NAID: 130007825927
  • ISSN: 2187-0136
  • Peer Reviewed / Open Access
• [Journal Article] High-order Spherical Modes Analysis for Small Spherical Helix Antennas (2018)
  • Author(s): Keisuke Fujita
  • Journal Title: Proc. of Progress In Electromagnetics Research Symposium (PIERS 2018) Volume: -
  • Peer Reviewed
• [Journal Article] Elliptically Polarized Compact Cylinder-Spiral Antenna (2018)
  • Author(s): Keisuke Fujita
  • Journal Title: Proc. of 2018 IEEE Conference on Antenna Measurements & Applications (CAMA) Volume: - Pages: 1-3
  • DOI: 10.1109/cama.2018.8530491
  • Peer Reviewed
• [Presentation] 小形球ヘリカルアンテナの放射効率に関する解析表現 (2021)
  • Author(s): 藤田 佳祐
  • Organizer: 2021年電子情報通信学会 総合大会
• [Presentation] 円筒ヘリカルアンテナの折り畳みシステムに関する研究 (2021)
  • Author(s): 上瀬 亮，藤田 佳祐
  • Organizer: 電気学会東京支部栃木・群馬支所
• [Presentation] 小形球ヘリカルアンテナの放射抵抗 (2020)
  • Author(s): 藤田 佳祐
  • Organizer: 2021年電子情報通信学会 ソサイエティ大会
• [Presentation] 球面波展開を用いた最適小型アンテナの解明と実現 (2020)
  • Author(s): 藤田佳祐
  • Organizer: 電子情報通信学会アンテナ伝搬研究会
  • Invited
• [Presentation] 折りたたみ円筒スパイラルアンテナの放射効率解析 (2019)
  • Author(s): 藤田佳祐
  • Organizer: 電子情報通信学会ソサイエティ大会
  • Invited
• [Presentation] Excitation of Eigenmode Current for Multiple Resonance Antenna (2019)
  • Author(s): Keisuke Fujita
  • Organizer: 2019 URSI International Symposium on Electromagnetic Theory
  • Int'l Joint Research / Invited
• [Presentation] 複数の周波数で共振する球面アンテナに関する基礎検討 (2019)
  • Author(s): 藤田佳祐
  • Organizer: 電子情報通信学会 総合大会
• [Presentation] 機械学習を用いたアンテナ設計支援システムの開発に関する基礎検討 (2019)
  • Author(s): Muhammad Syafiq bin Shahidan, 藤田 佳祐
  • Organizer: 情報処理学会 全国大会
• [Presentation] 円柱ヘリカルアンテナの放射効率に関する基礎検討 (2019)
  • Author(s): 藤田佳祐
  • Organizer: 電子情報通信学会 ソサイエティ大会
• [Presentation] High-order Spherical Modes Analysis for Small Spherical Helix Antennas (2018)
  • Author(s): Keisuke Fujita
  • Organizer: Progress In Electromagnetics Research Symposium (PIERS 2018)
  • Int'l Joint Research / Invited
• [Presentation] Elliptically Polarized Compact Cylinder-Spiral Antenna (2018)
  • Author(s): Keisuke Fujita
  • Organizer: 2018 IEEE Conference on Antenna Measurements & Applications (2018 IEEE CAMA)
  • Int'l Joint Research / Invited
• [Presentation] Recent Development of Electrically Small Spherical Helix Antennas (2018)
  • Author(s): Keisuke Fujita
  • Organizer: 12th Asia-Pacific Engineering Research Forum on Microwaves and Electromagnetic Theory (APMET 2018)
  • Int'l Joint Research / Invited
• [Presentation] 小型アンテナにおける放射効率限界の近似表現 (2018)
  • Author(s): 藤田佳祐
  • Organizer: 電気関係学会四国支部連合大会