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A sideband separating mixer for 85-115 GHz

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6 Author(s)
Vassilev, V. ; Dept. of Radio & Space Sci., Chalmers Univ. of Tech nology, Gothenburg, Sweden ; Belitsky, V. ; Risacher, C. ; Lapkin, I.
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This paper presents the results of development and tests of a sideband separating heterodyne receiver for the 85-115 GHz band with superconducting tunnel junctions (SIS) as frequency down converters. Sideband separation is achieved by using a quadrature scheme where two identical mixer junctions are pumped by a local oscillator (LO) with 90° phase difference. We used an innovative mixer layout where the quadrature scheme is implemented using waveguide-based and integrated on-chip components. We employed an additional pair of SIS junctions as terminations for LO-injection directional couplers.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:14 ,  Issue: 6 )