ISSTT Proceedings

ISSTT Proceedings

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Fixed tuned waveguide mixers around 450 GHz, 670 GHz and 810 GHz for a dual channel receiver

Authors:
C.E. Honingh, S. Haas, D. Hottgenroth, K. Jacobs, J. Stutzki
Abstract:
We developed a series of three SIS waveguide mixers for the frequency bands 440-500 GHz, 630-690 GHz and 760-820 GHz. The mixers have noise temperatures of approximately 80 K in the 490 GHz band, 130 K around 660 GHz, and about 900 K fi-om 770 GHz to 820 GHz. The waveguide mixer blocks are fixed tuned, robust and easily and quickly to fabricate. The waveguide horns are commercially available. We use Nb-Al203-Nb SIS junctions with an area of approximately 0.8 µm², a current density of about 15 kA/cm² and an all niobium integrated tuning structure. The micro stripline tuning structure consists of a series resonant stub followed by an impedance transformer. The two lower frequency mixers cover the full bandwidth of the respective atmospheric windows. The operating band of the high frequency mixer is presently limited by the local oscillator. The 430-500 GHz, and the 760-820 GHz mixers have been used very recently in a two channel receiver for radio astronomic observations at the Submillimeter Telescope Observatory (SMTO).
Categories:
SIS Mixers
Year:
1996
Session:
1
Full-text:
Download a PDF of this paper.
Page Number(s):
63-75