ISSTT Proceedings

ISSTT Proceedings

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Broadband Array SIS Mixers For 780

Authors:
Sybille Haas, StephanWulff, Dirk Hottgenroth, Netty Honingh, Karl Jacobs
Abstract:
As a building block for an 8-pixel 800 Gliz array receiver at KOSMA we developed a low noise SIS mixer. The mixerblock is tunerless and similar to the "stamped waveguide cavity" mixers we have used from 345 GHz to 800 GHz before. We embedded the SIS junction into a standard broadband tuning circuit, commonly used at lower frequencies. The circuit consists of a short end-loaded stub in series with two impedance transforming sections. For the 780-880 GHz band, we fabricated the electrodes of the tuning circuit as a combination of niobium and aluminum layers in different sequences. First heterodyne tests were performed on devices with a tuning microstrip circuit ground plane consisting of 40nm Nb with 200nm of Al on top and a top conductor consisting of a 70 nm thick Nb layer with a 280 nm thick Al layer on top.
Categories:
SIS
Year:
2000
Session:
2
Full-text:
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Page Number(s):
95-104