Development of very small isolators for multiband operation

• Project/Area Number: 25420333
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Electron device/Electronic equipment
• Research Institution: Yamaguchi University
• Principal Investigator: YAMAMOTO Setsuo 山口大学, 理工学研究科, 教授 (30182629)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: アイソレータ / 小型化 / 低背化 / 非可逆回路素子 / 非相反回路素子 / サーキュレータ

Outline of Final Research Achievements

The feasibility of multiband operation of a nonreciprocal transmission device for electromagnetic wave (isolator) was investigated. The isolator can be drastically miniaturized due to large wavelength shortening effect and large permeability difference for clockwise and counterclockwise circularly polarized electromagnetic wave, which are realized by setting the operation point of the isolator in the vicinity of ferromagnetic resonance of ferrite.
Optimal design flow of the isolator was established, and the magnetic bias field variable mechanism for multiband operation of the isolator was proposed, and the effectiveness was proved. In the isolator with a ferrite magnetic disk on a coplanar wave guide transmission line, practically utilizable nonreciprocal transmission characteristics was achieved in 4 GHz,2 GHz and 800 MHz bands in IMT-Advanced system.

Research Products

• [Journal Article] 高周波マイクロ磁気応用技術の最新動向 (2014)
  • Author(s): 山本節夫
  • Journal Title: 電気学会技術報告 Volume: 第1313号 Pages: 31-34
• [Presentation] 小型・低背型のトップマウント型アイソレータ (2015)
  • Author(s): 米原正道、若松孝志、藤井重男、栗巣普揮、山本節夫
  • Organizer: 第39回日本磁気学会学術講演会
  • Place of Presentation: 名古屋大学（愛知県名古屋市）
  • Year and Date: 2015-09-08
• [Presentation] 広帯域CPWトップマウント型アイソレータ (2015)
  • Author(s): 米原正道、若松孝志、藤井重男、栗巣普揮、山本節夫
  • Organizer: 第39回日本磁気学会学術講演会
  • Place of Presentation: 名古屋大学（愛知県名古屋市）
  • Year and Date: 2015-09-08
• [Presentation] Small isolator operating in 800 MHz, 2 GHz and 4 GHz bands (2014)
  • Author(s): Kaihei Nishijima, Takashi Wakamatsu, Hiroshi Sato, Shigeo Fujii, Hiroki Kurisu and Setsuo Yamamoto:
  • Organizer: The 15th IUMRS-International Conference in Asia (IUMRS-ICA 2014)
  • Place of Presentation: Fukuoka University(福岡市)
  • Year and Date: 2014-08-24 – 2014-08-30
• [Presentation] Small isolator operating in 800 MHz, 2 GHz and 4 GHz bands (2014)
  • Author(s): Kaihei Nishijima, Takashi Wakamatsu, Hiroshi Sato, Shigeo Fujii, Hiroki Kurisu and Setsuo Yamamoto
  • Organizer: The 15th IUMRS-International Conference in Asia (IUMRS-ICA 2014)
  • Place of Presentation: Fukuoka University, Fukuoｋa, Japan
• [Presentation] Extremely Small Isolator for 2 GHz and 4 GHz band (2013)
  • Author(s): Nishijima, K.; Kurisu, H.; Fujii, S, Yamamoto, S.
  • Organizer: THE 11TH INTERNATIONAL CONFERENCE ON FERRITES (ICF 11), ICF 11 Abstract booklet of THE 11TH INTERNATIONAL CONFERENCE ON FERRITES
  • Place of Presentation: Okinawa Convention Center, Ginowan, Japan
• [Presentation] Design of Small Isolator operating in 2 GHz and 4 GHz band (2013)
  • Author(s): K. Nishijima, H. Kurisu, S. Fujii, S, Yamamoto
  • Organizer: 23rd Annual Meeting of MRS-J (2013)
  • Place of Presentation: Yokohama Information & Culture Center, Yokohama, Japan