Development of SIS Mixers for SMA 400-520 GHz Band

Details Development of SIS Mixers for SMA 400-520 GHz Band Development of SIS Mixers for SMA 400-520 GHz Band

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009stt..conf...24l&link_type=abstract

Proceedings of the 20th International Symposium on Space Terahertz Technology, held April 20-22, 2009, in Charlottesville, VA, U

Astronomy and Astrophysics

Astronomy

Scientific paper

SIS junction mixers were developed for SMA between the horn section and the back piece of the block in a 400-520 GHz band. The results show receiver noise temperature around 100 K across the band, with noise contribution from RF loss and IF estimated to be around 50 K and 20K, respectively. Two schemes were used to tune out junction's parasitic capacitance. When a parallel inductor is employed, the input impedance is close to Rn, which facilitates impedance matching between the junction and the waveguide probe. Waveguide probes were designed to achieve a low feed-point impedance to match to the junction resistance. Optimum embedding impedances for lower receiver noise temperature were investigated. Performances of two schemes and composition of receiver noise were also discussed.

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