ISSTT Proceedings

ISSTT Proceedings

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SIS Receivers with Large Instantaneous Bandwidth for Radio Astronomy

Authors:
K. Jacobs, U. Müller, U. Schwenk, D. Diehl, C.E. Honingh, S. Haas
Abstract:
The fast progress in developing low noise SIS receivers up to the 700GHz range is mainly due to the application of the niobium technology which enables the use of various types of low loss tuning structures to tune out the large geometrical capacitance of SIS junctions. This paper describes receivers in the 230GHz, 345GHz, and 490GHz bands that all use the "three step transformer" circuit presented. This wide band tuning structure is an excellent choice to develop fixed tuned mixers, which are convenient for the facility-type operation of the receivers intended at the KOSMA Gornergrat telescope. The mixers are used in polarization-split dual frequency receivers, one with channels at 230GHz and 345GHz for the summer months and 490GHz and 345GHz for the months with highest atmospheric transmission. The second dual channel receiver will operate at 490GHz and 690GHz, with a possible exchange of one mixer for a 809GHz system. The waveguide mixer blocks, the Nb-Al203-Nb SIS junctions and the cooled IT amplifiers are fabricated at the University of Cologne. The local oscillator-sources are commercial components.
Categories:
SIS Receivers
Year:
1994
Session:
1
Full-text:
Download a PDF of this paper.
Page Number(s):
60-72