Quasi-optical 0.5 THz SIS receiver with twin junction tuning circuit

S. W. Jacobsson

doi:10.1117/12.2298570

30 August 1993 Quasi-optical 0.5 THz SIS receiver with twin junction tuning circuit

S. W. Jacobsson

Proceedings Volume 2104, 18th International Conference on Infrared and Millimeter Waves; 21043U (1993) https://doi.org/10.1117/12.2298570
Event: 18th International Conference on Infrared and Millimeter Waves, 1993, Colchester, United Kingdom

Abstract

A quasi optical SIS mixer for the frequency band 400-550 GHz has been designed and successfully testedin a laboratory receiver setup. The intrinsic SIS junction capacitance was tuned out by a novel pair (twin) SISjunction compensation circuit. The 4Ã‚Âµm2 area Nb-A10x-Nb junctions, with (oRnC product as high as 7.4 at500 GHz, were patterned by optical lithography and integrated with a equiangular spiral antenna to give broad- band SIS mixer operation. The receiver demonstrated flat response within the tuning range of the available LOsource (440 - 520 GHz) with DSB noise temperatures below 300 K over the entire band and with the best re- ceiver noise temperature below 250 K DSB at 453 GHz (measured at 3.5 K physical temperature). No mechani- cal tuning was employed in the SIS mixer. These noise temperatures include all losses and was measured atan IF center frequency of 1.5 GHz.

Citation Download Citation

S. W. Jacobsson "Quasi-optical 0.5 THz SIS receiver with twin junction tuning circuit", Proc. SPIE 2104, 18th International Conference on Infrared and Millimeter Waves, 21043U (30 August 1993); https://doi.org/10.1117/12.2298570

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