ISSTT Proceedings

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A Low Noise 565-735 GHz SIS Waveguide Receiver

Authors:
J.W. Kooi, C.K. Walker, H.G. LeDuc, P.L. Schaffer, T.G. Phillips
Abstract:
We report recent results on a 565-735 GHz SIS heterodyne receiver employing a 0.36µm² Nb/A10x/Nb SIS tunnel junction with high quality circular non-contacting backshort and E-plane tuners in a full height waveguide mount. No resonant tuning structures have been incorporated in the junction design at this time, even though such structures are expected to help the performance of the receiver. The receiver operates to 735 GHz, well above the gap frequency of niobium, [approx.] 680 GHz. Typical receiver noise temperatures from 565-690 GHz range from 160K to 230K with a best value of 185K DSB at 648 GHz. At 730 GHz the receiver noise temperature has gradually increased from 230K to 300K. The monotonic rise in noise temperature above 680 GHz is attributed to a combined effect of absorption loss in the niobium RF choke and antenna transmission lines and inability to tune out the large parasitic junction susceptance. With the mixer cooled from 4.3K to 2K the measured receiver noise temperatures decreased by approximately 15%, giving roughly 180K DSB from 660 to 680 GHz. The receiver has a full 1 GHz IF passband and has been successfully installed at the Caltech Submillimeter Observatory in Hawaii.
Categories:
SIS Receivers
Year:
1994
Session:
1
Full-text:
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Page Number(s):
126-141