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A dual-polarized quasi-optical SIS mixer at 550 GHz

Chattopadhyay, Goutam and Miller, David and LeDuc, Henry G. and Zmuidzinas, Jonas (2000) A dual-polarized quasi-optical SIS mixer at 550 GHz. IEEE Transactions on Microwave Theory and Techniques, 48 (10). pp. 1680-1686. ISSN 0018-9480. doi:10.1109/22.873895.

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In this paper, we describe the design, fabrication, and the performance of a low-noise dual-polarized quasi-optical superconductor-insulator-superconductor (SIS) mixer at 550 GHz. The mixer utilizes a novel cross-slot antenna on a hyperhemispherical substrate lens, two junction tuning circuits, niobium trilayer junctions, and an IF circuit containing a lumped element 180° hybrid. The antenna consists of an orthogonal pair of twin-slot antennas, and has four feed points, two for each polarization. Each feed point is coupled to a two-junction SIS mixer. The 180° IF hybrid is implemented using a lumped element/microstrip circuit located inside the mixer block. Fourier transform spectrometer measurements of the mixer frequency response show good agreement with computer simulations. The measured co-polarized and cross-polarized patterns for both polarizations also agree with the theoretical predictions. The noise performance of the dual-polarized mixer is excellent giving uncorrected receiver noise temperature of better than 115 K (double sideband) at 528 GHz for both the polarizations.

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Chattopadhyay, Goutam0000-0001-7942-5025
Additional Information:© 2000 IEEE. Reprinted with permission. Manuscript received May 19, 1999. This work was supported in part by the National Aeronautics and Space Administration/Jet Propulsion Laboratory and its Center for Space Microelectronics Technology, in part by the National Aeronautics and Space Administration Grant NAG5-4890, Grant NAGW-107, and Grant NAG2-1068, in part by the National Aeronautics and Space Administration/Universities Space Research Association Stratospheric Observatory for Infrared Astronomy Instrument Development Program, and in part by the California Institute of Technology Submillimeter Observatory under National Science Foundation Grant AST-9615025. The authors would want to thank J. W. Kooi, California Institute of Technology (Caltech), Pasadena, J. Ward, Caltech, Pasadena, F. Rice, Caltech, Pasadena, and J. Kawamura, Caltech, Pasadena, for their suggestions and helpful discussions.
Subject Keywords:Dual polarization, low noise, mixer, quasi-optical, superconductor–insulator–superconductor
Issue or Number:10
Record Number:CaltechAUTHORS:CHAieeetmtt00
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1812
Deposited By: Archive Administrator
Deposited On:19 Feb 2006
Last Modified:08 Nov 2021 19:42

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