ALMA Memo #279

A submm SIS receiver with an integrated superconducting LO

V.P. Koshelets [1], S.V. Shitov [1]

November 4, 1999

Keywords: SIS, receiver, LO, submm

Fully Superconducting Integrated Receiver has been developed in tight collaboration between Space Research Organization of the Netherlands (SRON-Groningen) and Institute of Radio Engineering and Electronics (IREE-Moscow). This single-chip submm receiver contains a planar double-dipole antenna, SIS mixer and a superconducting Josephson-type local oscillator (flux-flow oscillator, FFO). The receiver has demonstrated a DSB noise temperature below 100 K around 500 GHz being pumped by its internal LO. The instantaneous bandwidth of 15 - 20 % has been estimated via heterodyne measurements, that meets the requirements of most practical applications. The far field antennas beam has been measured as ~f/10 with sidelobes below - 16 dB that makes Integrated Receiver suitable for coupling to a real telescope antenna. A 9-pixel imaging array receiver with each pixel containing an internally pumped receiver chip has been developed and tested. Line width of a phase locked FFO as low as 1 Hz has been measured relatively to reference oscillator in the frequency range 270 - 440 GHz.

[1] Institute of Radio Engineering and Electronics RAS-Moscow

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Last modified: 1999-dec-09