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A 650-GHz Band SIS Receiver for Balloon-Borne Limb-Emission Sounder

  • Yoshihisa Irimajiri
  • Takashi Noguchi
  • Sheng-Cai Shi
  • Takeshi Manabe
  • Satoshi Ochiai
  • Harunobu Masuko
Article

Abstract

A superconducting low-noise receiver has been developed for atmospheric observations in the 650-GHz band. A waveguide-type tunerless mixer mount was designed based on one for the 200-GHz band. Two niobium SIS (superconductor-insulator-superconductor) junctions were connected by a tuning inductance to cancel the junction capacitance. We designed the ωRnCj product to be 8 and the current density to be 5.5 kA/cm2. The measured receiver noise temperature in DSB was 126-259 K in the frequency range of 618-660 GHz at an IF of 5.2 GHz, and that in the IF band (5-7 GHz) was 126-167 K at 621 GHz. Direct detection measurements using a Fourier transform spectrometer (FTS) showed the frequency response of the SIS mixer to be in the range of about 500-700 GHz. The fractional bandwidth was about 14%. The SIS receiver will be installed in a balloon-borne limb-emission sounder that will be launched from Sanriku Balloon Center in Japan.

SIS submillimeter-waves superconductor low-noise receiver atmospheric observations 

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References

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Copyright information

© Plenum Publishing Corporation 2000

Authors and Affiliations

  • Yoshihisa Irimajiri
    • 1
  • Takashi Noguchi
    • 2
  • Sheng-Cai Shi
    • 3
  • Takeshi Manabe
    • 1
  • Satoshi Ochiai
    • 1
  • Harunobu Masuko
    • 1
  1. 1.Communications Research LaboratoryMinistry of Posts and TelecommunicationsTokyoJapan
  2. 2.Nobeyama Radio ObservatoryNational Astronomical Observatory of JapanNaganoJapan
  3. 3.Purple Mountain ObservatoryNanjing, JiangsuChina

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