A 350GHz Radial-Probe SIS Mixer for Astronomical Imaging Arrays |
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| Authors: | S Withington J Leech G Yassin K G Isaak B D Jackson J R Gao and T M Klapwijk |
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| Institution: | (1) Cavendish Laboratory, University of Cambridge, Cambridge, UK;(2) Space Research Organisation Netherlands, Groningen, The Netherlands;(3) Department of Applied Physics, Delft University of Technology, Delft, The Netherlands |
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| Abstract: | We have developed a 330-370GHz SIS mixer for small-format, heterodyne, astronomical imaging arrays. Fixed-tuned broadband operation is achieved by means of a superconducting radial waveguide probe. A horn-reflector antenna provides high-efficiency optical coupling. Using a variable-temperature cryogenic noise source, we measured a DSB system noise temperature of 32±1K. The mixer contributes 3±3K, supporting the theoretically-predicted result that the noise temperature of a DSB mixer can be less than h /2 (8.6K) |
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