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Study on the Ultrawide-Band Ultrahighly Sensitive Radio Receiver Based on the Direct Digitization of Radio Signals

Research Project

Project/Area Number 13450155
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 情報通信工学
Research InstitutionNagoya University

Principal Investigator

FUJIMAKI Akira  Nagoya University, Department of Quantum Engineering, Associate Professor, 工学研究科, 助教授 (20183931)

Co-Investigator(Kenkyū-buntansha) INOUE Masumi  Nagoya University, Department of Quantum Engineering, Assistant Professor, 工学研究科, 講師 (00203258)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥14,800,000 (Direct Cost: ¥14,800,000)
Fiscal Year 2003: ¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 2002: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2001: ¥6,500,000 (Direct Cost: ¥6,500,000)
Keywordssoftware radio / high-Tc superconductor / tunable filter / Josephson junction / scattering / integration technology / single flux quantum circuit / AD converter / フィルタ / ランプエッジ型接合 / 超伝導コンタクト / ガス分圧 / 高温超伝導
Research Abstract

This research directed to develop the receiver frontend based superconducting technology and to prove broad-band capability and high sensitivity of that. Following results were obtained.
1. Development of Tunable Analog Bandpass Fitters : In order to develop tunable filters using superconducting films, we first designed and fabricated microstrip resonator as a basic element. Tuning was carried out mechanicaly by moving a dielectric plate placed near the filter using an actuator. Low loss and large shift of center frequency of 3-15% was observed in the experiment. For further flexible tuning, we designed lumped-element-type 3-pole bandpass filter, and confirmed that the center frequency and the bandwidth can be changed separately in wide ranges.
2. Design of AD Converter : AD converters that convert radio signals to digital data by direct sampling were analyzed and designed by numerical calculation. We devised a system that enables high performance without making high order structure by separating quantization and sampling. Applicability of high-Tc circuits to such AD converter system was investigated.
3. Development of Basic Technology for Digital Circuit Fabrication : We succeeded to suppress the leak currents dramatically by doping small amount of Pr and Ga during the process of the barrier formation. Nonuniformity of the barrier layer of ramp-edge junctions along the thickness direction was suggested as one of the origins of the scattering. Deposition conditions were amended by lowering the nonuniformity of the temperature and introducing gas partial pressure monitor, for reproducibility of superconducting films.
4. Investigation of Integration Technology for High-Tc Circuit : Multilayer structure of superconducting layers and insulating layers and superconducting contact, which are necessary for circuit integration, were investigated, and structures applicable to superconducting circuits were obtained.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Michitaka Maruyama, et al.: "Planarization of the YBa_2Cu_3U_<7-x> Base Electrodes in Trilayer Josephson Junctions"Jpn.J.Appl.Phys.Pt.2. 40. L932-L934 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Shigeki Hontsu, et al.: "Mechanically Tunable High-Temperature Superconducting Microwave Filter with Large Shift of Resonant Frequency"Jpn.J.Appl.Phys.Pt.2. 40. L1148-L1150 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yasuyuki Yoshinaga, et al.: "Improvement of interface-treated junctions using vicinal SrTiO_3 substrates"Supercond.Sci.Technol.. 14. 1001-1004 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takuma Ito, et al.: "The improvement of the characteristics of ramp-edge Junctions with interface modified barriers"Supercond.Sci.Technol.. 14. 1052-1055 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Shigenobu Mine, et al.: "Large Tunability of the Resonant Frequency of Superconducting Coplanar Waveguide Resonator by Mechanically Tunable Method"Sing.J.Phys.. 18. 133-137 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Masumi Inoue, et al.: "Simulation Study on the Mechanical Tuning of High-T_c Superconducting Microwave Filters"IEEE Trans.Appl.Supercond.. 13. 704-707 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Shigeki Hontsu, et al.: "Study of Mechanically Tunable Superconducting Microwave Filter Using Lumped Elements"IEEE Trans.Appl.Supercond.. 13. 720-723 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Maruyama, et al.: "Planarization of the YBa_2Cu_3O_<7-x> Base Electrodes in Trilayer Josephson Junctions"Jpn.J.Appl.Phys.Pt.2. 40(9A/B). L932-L934 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Hontsu, et al.: "Mechanically Tunable High-Temperature Superconducting Microwave Filter with Large Shift of Resonant Frequency"Jpn.J.Appl.Phys.Pt.2. 40(11A). L1148-L1150 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Yoshinaga, et al.: "Improvement of interface-treated junctions using vicinal SrTiO_3 substrates"Supercond.Sci.Technol.. 14(12). 1001-1004 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Ito, et al.: "The improvement of the characteristics of ramp-edge junctions with interface modified barriers"Supercond.Sci.Technol.. 14(12). 1052-1055 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Mine, et al.: "Large Tunability of the Resonant Frequency of Superconducting Coplanar Waveguide Resonator by Mechanically Tunable Method"Sing.J.Phys.. 18(1). 133-137 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Inoue, et al.: "Simulation Study on the Mechanical Tuning of High-Ta Superconducting Microwave Filters"IEEE Trans.Appl.Supercond.. 13(2). 704-707 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Hontsu, et al.: "Study of Mechanically Tunable Superconducting Microwave Filter Using Lumped Elements"IEEE Trans.Appl.Supercond.. 13(2). 720-723 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Masumi Inoue: "Simulation Study on the Mechanical Tuning of High-T_c Superconducting Microwave Filters"IEEE Trans.Appl.Supercond.. 13(2). 704-707 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Shigeki Hontsu: "Study of Mechanically Tunable Superconducting Microwave Filter Using Lumped Elememnts"IEEE Trans.Appl.Supercond.. 13(2). 720-723 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Shigenobu Mine: "Large Tunability of the Resonant Frequency of Superconducting Coplanar Waveguide Resonator by Mechanically Tunable Method"Sing. J. Phys.. 18(1). 133-137 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] A.Fujimaki, K.Nakazono 他7名: "Broad Band Software-Defined Radio Receivers Based on Superconductive Devices"IEEE Trans. Appl. Supercond.. 11(1). 318-321 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Maruyama, A.Fujimaki 他7名: "Study on Fabrication Conditions of the Interface-Treated Trilayer Junctions"IEEE Trans. Appl. Supercond.. 11(1). 788-790 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Maruyama, A.Fujimaki 他7名: "Planarization of the YBa2Cu3O7-x Base Electrodes in Trilayer Josephson Junctions"Jpn. J. Appl. Phys. Pt.2. 40(9A/B). 932-934 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Hontsu, A.Fujimaki 他4名: "Mechanically Tunable High-Temperature Superconducting Microwave Filter with Large Shift of Resonant Frequency"Jpn. J. Appl. Phys. Pt.2. 40(11A). 1148-1150 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Yoshinaga, A.Fujimaki 他6名: "Improvement of interface-treated junctions using vicinal SrTiO3 substrates"Supercond. Sci. Technol.. 14(12). 1001-1004 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Ito, A.Fujimaki 他3名: "The improvement of the characteristics of ramp-edge junctions with interface modified barriers"Supercond. Sci. Technol.. 14(12). 1052-1055 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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