ISSTT Proceedings

ISSTT Proceedings

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Design and Characterization of 225 — 370 GHz DSB and 250 — 360 GHz SSB Full Height Waveguide SIS Mixers

Authors:
A. Navarrini, B. Lazareff, D. Billon-Pierron, I. Peron
Abstract:
We describe the design, construction, and characterization of two SIS mixers: a DSB mixer for the band 275-370 GHz, intended for band 7 of the ALMA frontend, and a SSB mixer, backshort tuned, intended for IRAM's Plateau de Bure interferometer, and covering the band 260-360 GHz. These two mixers share various common design features, such as a wideband single ended probe transition from full height waveguide to microstrip, and they use the same mixer chip. A significant challenge, especially for the SSB mixer, has been to achieve not only low noise, but also stable operation over the design band. The receiver noise for the DS13 mixer is found to be below 50 K over 100 GHz of RF bandwidth, with a minimum as low as 27 K (uncorrected) at 336 GHz. The SSB receiver has a measured image rejection of order —14dB over the design band, and its noise remains below 80 K (effectively a SSB receiver noise value).
Categories:
SIS
Year:
2002
Session:
1
Full-text:
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Page Number(s):
33-40