A 345 GHZ heterodyne receiver for the James Clerk Maxwell Telescope

  • C. T. Cunningham
  • R. H. Hayward
  • J. D. Wade
  • S. R. Davies
  • D. N. Matheson


In this paper we describe the design and performance of a low-noise 345 GHz heterodyne receiver. The mixer uses a lead alloy SIS tunnel junction mounted in reduced height rectangular waveguide and is tuned with a single backshort. Local oscillator power is provided by a broad-band Gunn oscillator which drives a frequency quadrupler. The heterodyne performance has been verified in the laboratory using a gas absorption cell. In November 1991 this receiver was successfully commissioned and by direct comparison with a Schottky diode receiver we confirm a best receiver noise temperature of 150K (DSB) at 355 GHz and a tuning range of 300 to 380 GHz. The receiver is now available as a JCMT facility instrument.

key words

SIS-mixer quasiparticle mixer millimetre waves 


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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • C. T. Cunningham
    • 1
  • R. H. Hayward
    • 1
  • J. D. Wade
    • 1
  • S. R. Davies
    • 2
  • D. N. Matheson
    • 3
  1. 1.Herzberg Institute of AstrophysicsNational Research Council of CanadaOttawa
  2. 2.Electronic Enginnering LaboratoriesUniversity of Kent at CanterburyKentCanterburyUK
  3. 3.Rutherford Appleton LaboratoryDidcotUK

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