山梨大学大学院 総合研究部　工学学域電気電子情報工学系
關谷・作間研究室
Sekiya/Sakuma　Laboratory
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  1. N. Sekiya, K. Sakuma, T. Akahori, "HTS penta-band bandpass filter for radio astronomy broadband receiver in the UHF band," IEEE Trans. Appl. Supercond. vol. 34, 1500105, May. 2024.new

  2. N. Oshimoto, T. Fujita. K. Sakuma, N. Sekiya, "Temperature dependence of power transfer efficiency and power handling capability of wireless power transfer system using superconducting bulk coil," Appl. Phys. Express, vol. 17, 043001, Apr., 2024.new

  3. N. Sekiya, K. Sakuma, T. Akahori, "Design of superconducting hex-band bandpass filter using new external quality factor adjustment method," IEEE Trans. Appl. Supercond. vol. 33, 1501305, Aug. 2023.

  4. N. Sekiya, N. Oshimoto, K. Ebihara, T. Uchida, K. Sakuma, S. Ono, "Wireless power transfer system using high-quality factor superconducting transmitting coil for biomedical capsule endoscopy," IEEE Trans. Appl. Supercond. vol. 33, 1500905, Aug. 2023.

  5. N. Oshimoto, K. Sakuma, N. Sekiya, "Improvement in power transmission efficiency of wireless power transfer system using superconducting intermediate coil," IEEE Trans. Appl. Supercond. vol. 33, 1501004, Aug. 2023.

  6. K. Sakuma, K. Ito, J. Murakami, A. Saito, N. Sekiya, “Preparation of trifluoroacetate metal organic deposition derived REBa2Cu3Oy thin film with high-Jc and low-Rs for high-power high-temperature superconducting transmit filters,” IEEE Trans. Appl. Supercond. vol. 33, 1500404, Aug. 2023.

  7. K. Sakuma, S. Rachi, G. Mizoguchi, T. Nakajima, A. Mizuno, N. Sekiya, “A superconducting dual-band bandpass filter for IF signals of multi-frequency millimeter-wave atmospheric spectrometer,” IEEE Trans. Appl. Supercond. vol. 33, 2500104, Aug. 2023.

  8. N. Sekiya, M. Sawada, “Experimental results of ultra-high-efficiency wireless power transfer using extremely high quality factor superconducting coil with double-sided coated conductor tape,” IEEE Trans. Appl. Supercond. vol. 33, 6601206, Apr. 2023.

  9. Natsuka Oshimoto, Keita Sakuma, Satoshi Ono and Naoto Sekiya, “High power transmission efficiency of wireless power transfer system using high-quality factor superconducting bulk coil,” Appl. Phys. Express vol. 16, 023002, Feb. 2023.

  10. 小川純，清水琢朗，山口敦也，李雨桐，福井聡， 關谷尚人, “非接触給電用超電導共振器の電流分布が交流損失特性に及ぼす影響,” 低温工学58巻１号, pp. 27-33, 2023年1月.

  11. N. Sekiya, K. Sakuma,“High-Order Compact Superconducting Dual-Band Bandpass Filters for Radio Astronomy,” 2022 Asia-Pacific Microwave Conference Proceedings, Jan. 2023.

  12. S. Rachi, K. Sakuma, T. Akahori, N. Sekiya, “Development of highly selective compact high-temperature superconducting quad-band bandpass filter using interdigital feeding structure for radio astronomy,” Superconductor Science and Technology, vol.36, 025006, Dec. 2022.

  13. Masashi Miura, Go Tsuchiya, Takumu Harada, Keita Sakuma, Hodaka Kurokawa, Naoto Sekiya, Yasuyuki Kato, Ryuji Yoshida, Takeharu Kato, Koichi Nakaoka, Teruo Izumi, Fuyuki Nabeshima, Atsutaka Maeda, Tatsumori Okada, Satoshi Awaji, Leonardo Civale and Boris Maiorov, “Thermodynamic approach for enhancing superconducting critical current performance,” NPG Asia Materials volume 14, Article number: 85, Oct. 2022. 　2023年度応用物理学会超伝導分科会論文賞

  14. M. Okeda, K. Sakuma, N. Sekiya, “High efficiency wireless power transmission system that uses HTS transmitting and copper receiving coils with large difference in quality factor,” IEEE Trans. Appl. Supercond. vol. 32, 5400305, Jun. 2022.

  15. T. Ito, N. Sekiya, K. Makino, T. Yamaguchi, M. Nagao, S. Kotani, H. Watanabe,“Extraction of Non-Diagnosable Images Captured by a Capsule Endoscope and Polyp Detection Using YOLOv5,” 2022 IEEE/SICE International Symposium on System Integration (SII), Jan. 2022, DOI:10.1109/SII52469.2022.9708904, 国際会議プロシーディングス

  16. 林拓麿, 關谷尚人, 大野剛 “深宇宙探査用地上局向け超伝導フィルタの開発,” 電子情報通信学会和文論文誌C, vol. J104-C, no. 9, pp. 275-280, Sep. 2021　招待論文

  17. T. Fujita, N. Sekiya, “Design and performance of superconducting bulk coil for RF applications,” IEEE Trans. Appl. Supercond. vol. 31, 3064538, Aug. 2021.

  18. K. Makino, H. Watanabe, Tatsuya Yamaguchi, H. Terada, N. Sekiya, “Study on Fins Knit by Two Kinds of Biodegradable String for a Manipulatable Endoscope,” 2021 IEEE 3rd Global Conference on Life Sciences and Technologies (LifeTech 2021), Mar. 2021, DOI: 10.1109/LifeTech52111.2021.9391823 国際会議プロシーディングス

  19. N. Sekiya, N. Kitada, K. Kishida, T. Tsuruoka, “Compact narrowband high-order dual-band superconducting bandpass filters using stub-loaded double-folded resonators,” Superconductor Science and Technology, vol. 33, 095002, Jul. 2020.

  20. N. Sekiya, E. Yoshioka, H. Hoshi, A. Saito and S. Ohshima, “Design of NMR RF Probe Constructed with High Temperature Superconducting Elliptical Coupled Resonators,” IEEE Trans. Appl. Supercond. vol. 29, 2019-6.

  21. N. Sekiya, T. Tsuruoka, “Improvement of filter properties of independently tunable superconducting dual-band bandpass filter,” IEEE Trans. Appl. Supercond. vol. 29, 2019-6.

  22. N. Sekiya, S. Kobayashi, “Compact, low loss and high power handling HTS dual-mode double-strip resonator filter with new feeding structure,” IEEE Trans. Appl. Supercond. vol. 29, 1500105, 2019-6.

  23. S. Ohshima, H. Hoshi, N. Takanashi, H. Yamada, A. Saito, E. Yoshioka, N. Sekiya, S. Tsuji, H. Suematsu, “Examination on high-Q NMR Transmit/Receiver pickup coils made by YBa2Cu3O7-d thin films,” IEEE Trans. Appl. Supercond. vol. 29, 1500105, 2019-6.

  24. T. Unno, N. Sekiya, “HTS filter with dielectric rods for tuning the center frequency and trimming the passband ripple,” Journal of Physics Conference series vol. 1054, 012061, 2018-7.

  25. N. Sekiya, T. Unno, “Independently tunable HTS dual-band bandpass filter using dielectric rods,” IEEE Trans. Appl. Supercond. vol. 28, 1500105, 2018-6.

  26. T. Unno, N. Sekiya, “Compact high-pole HTS tri-band bandpass filters using new feeding structure,” IEEE Trans. Appl. Supercond. vol. 28, 1500305, 2018-6.

  27. N. Sekiya, Y. Monjugawa, “A novel REBCO wire structure that improves coil quality factor in MHz range and its effect on wireless power transfer systems,” IEEE Trans. Appl. Supercond. vol. 27, 6602005, 2017-6.

  28. N. Sekiya, “Design of compact and high-power HTS double-strip dual-mode patch resonator filter for transmit filter applications,” IEEE Trans. Appl. Supercond. vol. 27, 1501804, 2017-6.

  29. N. Sekiya, “Design of compact HTS dual-band bandpass filters using dual-function feeding structure with wide stop-band response,” IEEE Trans. Appl. Supercond. vol. 27, 1501104, 2017-1.

  30. N. Sekiya, K. Hujihara, “Temperature dependence of power handling capability of HTS filter with double-strip resonator,” Physica C, vol. 530, pp. 117-119, 2016.

  31. N. Sekiya, “Design of high-order HTS dual-band bandpass filters with receiver subsystem for future mobile communication systems,” Physica C, vol. 527, pp. 91-97, 2016.

  32. N. Sekiya, S. Sugiyama, “HTS dual-band bandpass filter using stub-loaded hair-pin resonators with independently controllable bandwidths,” Physics Procedia. vol. 65, pp. 201-204, 2015.

  33. N. Sekiya, “Comparison of power handling capability of double-strip resonator filters with stripline structure and conventional microstrip line filters,” Physics Procedia.vol. 65, pp. 205-208, 2015.

  34. N. Sekiya, “Design of HTS modified double-strip resonator filter structure for transmit filter applications,” IEEE Trans. Appl. Supercond. vol. 25, 1501004, 2015.

  35. N. Sekiya, S. Sugiyama, “Design of miniaturized HTS dual-band bandpass filters using stub-loaded meander line resonators and their applications to tri-band band-pass filters,” IEEE Trans. Appl. Supercond. vol. 25, 1500805, 2015.

  36. 杉山俊介,　齊藤敦, 大嶋重利, 關谷尚人, “スタブ装荷ヘアピン共振器を用いた超伝導デュアルバンド帯域通過フィルタの設計,” 低温工学, vol. 49, pp. 534-540, 2014.

  37. N. Sekiya, S. Sugiyama, “HTS dual-bandbandpass filters using stub-loaded hair-pin resonators for mobile communicationsystems,” Physica C, vol. 504, pp. 88-92, 2014.

  38. N. Sekiya, T. Horiuchi, A. Saito, S. Ohshima, “Power handling capability of transmit HTS stripline filter with shuttle-shape resonators, “ Physics Procedia, vol. 58, pp. 212-215, 2014

  39. N. Sekiya, H. Matsuura, S. Kakio, S. Ohshima, “Use of additional patch conductor to realize HTS dual-mode filter with double-strip-resonator,” Physics Procedia, vol. 45, pp.209-212, 2013.

  40. N. Sekiya, H. Matsuura, M. Akiya, Y. Tanaka, S. Ohshima, “Novel HTS double-strip resonator for high-power application,” IEEE Trans. Appl. Supercond. vol. 23, p1500904, June 2013.

  41. 關谷尚人，和田光司，大嶋重利,”入出力整合補償回路を有する中心周波数可変インターディジタル結合共振器バンドパスフィルタに関する基礎検討,”エレクトロニクス実装学会誌, vol. 16, no. 3, pp. 211-217, May 2013．


  42. N. Sekiya, H. Harada , S. Ohshima,　“Design and fabrication of center frequency and bandwidth tunable HTS filter,” Physica C, vol. 484, pp. 179-182, January 2013.

  43. T. Horiuchi, N. Sekiya, S. Kakio, S. Ohshima, “Improvement of power handling capability and out-of-band rejection for HTS stripline filter with shuttle-shape resonators,” Physics Procedia, vol. 27, pp. 324-327, 2012.

  44. N. Imai, N. Sekiya, S. Kakio, S. Ohshima, “Use of double-layer coupling circuit and additional patch conductors to improve power handling capability of HTS transmit filter,” Physics Procedia, vol. 27, pp. 332-335, 2012.

  45. N. Sekiya, M. Nagao, S. Kakio, A. Saito, S. Ohshima, “Effect of coupling state on power handling capability of HTS transmit filters with stripline structure,” Physics Procedia, vol. 27, pp. 328-331, 2012.


  46. N. Sekiya, K. Yamamoto, S. Kakio, A. Saito, S. Ohshima, “Power handling capability of transmit filters using stripline structure,” Physica C, vol. 471 no. 21-22, pp. 1217-1220, 2011.

  47. N. Sekiya, N. Imai S. Kakio, A. Saito, S. Ohshima, “Miniaturized transmit dual-mode HTS patch filter with stripline structure,” Physica C, vol. 471 no. 21-22, pp. 1221-1223, 2011.

  48. N. Sekiya, K. Yamamoto, S. Kakio, A. Saito, S. Ohshima, “Miniaturized sharp-cutoff transmit HTS filter with a stripline structure,” Physica C, vol. 471 no. 21-22, pp. 1214-1216, 2011.

  49. H. Harada, N. Sekiya, S. Kakio, S. Ohshima, “Center frequency and bandwidth tunable HTS filter,” Physica C , vol. 471 no. 21-22, pp. 1224-1227, 2011.

  50. S. Ohshima, M. Uno, Y. Endo, S. Takeuchi, S. Ono, A. Saito, N. Sekiya, “Comparison of power handling capabilities of sliced and conventional microstrip line filter,” J. Phys. : Conf. Ser. vol. 234 no. 4, p. 42025, 2010.

  51. N. Sekiya, Y. Nakagawa, S. Ohshima, ”Design of transmit superconducting filter using step impedance resonators,” Physica C, vol. 470 no. 20, pp. 1503-1506, 2010.

  52. N. Sekiya, H. Harada , Y. Nakagawa, S. Ohshima　“Design and fabrication of bandwidth tunable transmit HTS filters using π shaped waveguides,” Physica C, vol. 470 no. 20, pp. 1499-1502, 2010 .


  53. N. Sekiya, Y. Nakagawa, A. Saito, S. Ohshima, “Technique for tuning center frequency of HTS microstrip filters without significantly changing bandwidth,” Physica C, vol. 469, pp. 1653-1657, 2009.

  54. Y. Koike, N. Sekiya, Y. Nakagawa, S. Ohshima, “Design of bandwidth tunable HTS filter using H-shaped waveguides,” Physica C, vol. 469, pp. 1658-1661, 2009.


  55. N. Sekiya, Y. Nakagawa, A. Saito, S. Ohshima, “Novel trimming techniquefor tunable HTS microstrip filters,” Physica C, vol. 468, pp. 1958-1961,2008.


  56. A. Saito, H. Teshima, H. Obara, S. Ono, M. Kimura,N. Sekiya, H. Hirano, S. Hirano, and S. Ohshima, “Design and Performance of Transmit Filters using HTS Bulk Resonators for IMT-Advanced Applications,” IEEE Transactions on Applied Superconductivity, vol. 17, No. 2, pp. 886-889, 2007.

  57. S. Ono, H. Harada, A. Saito, H. M. Kimura, N. Sekiya, S. Hirano, S. Ohshima H. Iriuda, T. Takahashi, and M. Yoshizawa, “Design and Fablication of 5 GHz Miniaturized Bandpass Filters using Superconducting Microstrip Quasi-Spiral Resonators,” IEEE Transactions on Applied Superconductivity, vol. 17, No. 2, pp. 890-893, 2007.


  58. 關谷尚人,　小野哲,　木村雅芳,　相沢慶二,　齋藤敦,　平野悟,　大嶋重利, “超伝導アンテナとフィルタのレーザトリミングによる特性改善,” 低温工学 41巻2号　p81-86, 2006.

  59. N. Sekiya, A. Kubota, A. Kondo, S. Hirano, A. Saito, S. Ohshima, “Broad-Band superconducting microstrip antenna using additional gap-coupled resonators,” Physica C vol. 445-448, pp. 994-997 2006.

  60. A. Saito, N. Sekiya, H. Teshima, H. Obara, Y. Noguchi, H. Hirano, S. Hirano, S. Ohshima, “Surface resistance measurement of modified QMG superconducting bulks,” Physica C vol. 445-448, pp. 330-333, 2006.

  61. Y. Noguchi, N. Sekiya, A. Saito, H. Yamasaki, Y. Nakagawa, S. Hirano, S. Ohshima, “Dependence of the surface resistance and critical current density in HTS thin films on an angle of applied magnetic field,” Physica C vol. 445-448, pp. 858-861, 2006.

  62. S. Ohshima, K. Takeishi, A. Saito, N. Sekiya, S. Hirano, T. Suzuki, Y. Takano, T. Nakamura, M. Yoko, M. Yamada, T. Watanabe, “New contactless Jc-measurement system for HTS coated conductors,” Physica C. 445-448, pp. 682-685, 2006.

  63. S. Ohshima, K. Kitamura, Y. Noguchi, N. Sekiya, A. Saito, S. Hirano, D. Okai, ”Surface Resistance of YBCO Thin Films under High DC Magnetic Fields,” Jounal of Physics, vol. 43, pp. 551-555, 2006.


  64. N. Sekiya, M. Mukaida, A. Saito, S. Hirano, S. Oshima, ”Examination of the Microwave Sensing System Using Superconducting Devices,” Physica C. 426-431, pp. 1622-1627, 2005.

  65. M. Takezawa, N. Sekiya, F. Aita, K. Aizawa, A. Saito, S. Hirano, S. Oshima, “Design and evaluation of a high-Tc superconducting multiplexer,” Physica C. vol. 426-431, pp. 1628-1632, 2005.

  66. F. Aita, N. Sekiya, S. Ono, M. Kimura, K. Aizawa, A. Saito, S. Hirano, S. Ohshima, “Improvement of filter properties using sapphire and nickel rod trimmers,” IEICE Trans. Electron., Vol. E89-C, No. 2, pp. 119-124, 2005.


  1. 關谷尚人　“高周波用超伝導線材による高Q値コイルの開発とそれを用いた高効率ワイヤレス電力伝送”　月刊車載テクノロジー, Vol. 11, No. 6，pp. 40-44, 2024年3月号

  2. 關谷尚人 テーマ解説“超伝導共振器のMHz帯からマイクロ波帯の応用―超伝導ワイヤレス電力伝送から超伝導マイクロ波フィルタまで―”　低温工学, 第54巻　第3号，pp. 166-173, 2019年

  3. 關谷尚人 “高Q値コイル（共振器）を実現するための新概念～高周波用超伝導線材構造の開発とその応用の可能性～”　電気評論, pp. 73-77, 2018年8月号

  4. 關谷尚人 “特集：超伝導マイクロ波・テラヘルツデバイス” 担当：超伝導デュアルバンド帯域通過フィルタの最新動向
    公益財団法人国際超電導産業技術研究センター，超伝導Web21　2014年2月号

  5. 關谷尚人 “高温超伝導現象と用途開発最前線” 担当：次世代高速・大容量移動体通信のための超伝導マルチバンドパスフィルタの研究
    株式会社エヌ・ティ・エス，pp.393-399, 2013年3月22日発行


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  19. 關谷尚人 ,岸田和人，佐藤　庸夫，寺尾　勝廣，“チューナブルデュアルバンド帯域通過フィルタ”
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