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18 November 1989 205 GHZ SIS Receiver Development For Remote Sensing Applications
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Proceedings Volume 1039, 13th Intl Conf on Infrared and Millimeter Waves; (1989) https://doi.org/10.1117/12.978351
Event: 13th International Conference on Infrared and Millimeter Waves, 1987, Honolulu, HI, United States
Abstract
There are many applications of remote sensing in the frequency range near 200 GHz. The determination of the role of man-made chlorine compounds in the destruction of the ozone layer observed through the emission from C/O near 200 GHz is one example. Another example is the observation of CO at 230 GHz as a tracer of matter in the interstellar medium. Heterodyne receivers are the instrument of choice to perform these observations due to their high sensitivity and spectral resolving power. The nonlinear tunneling currents in a superconductor-insulator-superconductor (SIS) tunnel junction have been shown both theoretically and experimentally[1] to provide the lowest noise mixing element at millimeter wavelengths in these receivers. When properly optimized, an SIS mixer displays the important properties of conversion efficiency greater than unity and noise temperature approaching the quantum limit.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
W. R. McGrath, C. N. Byrom, B. N. Ellison, M A. Frerking, and R. E. Miller "205 GHZ SIS Receiver Development For Remote Sensing Applications", Proc. SPIE 1039, 13th Intl Conf on Infrared and Millimeter Waves, (18 November 1989); https://doi.org/10.1117/12.978351
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