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2003 Fiscal Year Final Research Report Summary

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
Keywordssoftware radio / high-Tc superconductor / tunable filter / Josephson junction / scattering / integration technology / single flux quantum circuit / AD converter
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.

  • Research Products

    (14 results)

All Other

All Publications (14 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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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

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Published: 2005-04-19  

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