ISSTT Proceedings

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Development of a 600 - 700 GHz SIS Receiver

Authors:
W.R. McGrath, K. Jacobs, J. Stern, H.G. LeDuc, R.E. Miller, M.A. Frerking
Abstract:
We report here on the development of a 600 - 700 GHz SIS receiver employing a waveguide mount designed to tune a large junction capacitance. A large scale model was used to optimize the bandwidth and tuning range of the mount. A new design of noncontacting backshort has been developed for use at 600 GHz. It performs as well as competing conventional designs at 100 GHz but is easily fabricated for use at submillimeter wave frequencies. NbN tunnel junctions are being developed for this receiver. We have made a systematic study of the mixer gain and noise of these junctions shunted with microstrip lines as rf tuning elements. This has given values of junction capacitance of 85fF/µ² and magnetic penetration depth of 3800Å. Mixer noise temperature as low as 134K has been achieved which is the best reported to date for an NbN junction.
Categories:
Receivers, Systems
Year:
1990
Session:
4
Full-text:
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Page Number(s):
409-433