ISSTT Proceedings

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An Integrated Sideband Separating SIS Mixer for 200-280 GHz

Authors:
A. R. Kerr, S.-K. Pan, H. G. LeDuc
Abstract:
Separate waveguides for the signal and LO are connected via suspended striplines to a 2 × 1 mm quartz substrate which contains all the RE components of the sideband separating mixer: quadrature hybrid, LO power splitter, two LO couplers, and two SIS mixers. These components are realized in capacitively-loaded coplanar waveguide, which minimizes stray coupling between adjacent components and coupling to undesired modes in the thick quartz substrate. Over the 200-280 GHz band, the mixer noise temperature was 50-150 K and the overall receiver noise temperature was 60-200 K (both measured outside the vacuum window). The sideband separation was greater than or equal to 9 dB, which we hope to improve by reducing leakage of LO power under the substrate into the signal port, and by improving the match of the cold termination of the fourth port of the input quadrature hybrid.
Categories:
Receivers, SIS Mixers
Year:
1998
Session:
5
Full-text:
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Page Number(s):
215-221