Quasi-optical SIS mixers with normal metal tuning structures
Abstract
We recently reported (1996) a quasi-optical SIS mixer which used Nb/Al-oxide/Nb tunnel junctions and a normal-metal (Al) tuning circuit to achieve an uncorrected receiver noise temperature of 840 K (DSB) at 1042 GHz. Here we present results on several different device designs, which together cover the 300-1200 GHz frequency range. The mixers utilize an antireflection-coated silicon hyper-hemispherical lens, a twin-slot antenna, and a two-junction tuning circuit. The broad-band frequency response was measured using Fourier transform spectrometry (FTS), and is in good agreement with model calculations. Heterodyne tests were carried out from 400 GHz up to 1040 GHz, and these measurements agree well with the FTS results and with calculations based on Tucker's theory (1985).
Additional Information
© Copyright 1997 IEEE. Reprinted with permission. This work was supported in part by grants from NASA (NAGW-107 and NAG2-744), NASA/JPL, and a NSF PYI grant to J.Z. The junction fabrication was performed at the Center for Space Microelectronics Technology, Jet Propulsion Laboratory, California Institute of Technology, and was sponsored by NASA, Office of Space Access Technology. We are very grateful to P. Zimmerman for the loan of his 1 THz multiplier chain, and thank G. Blake and P. Stockman for their help with the FIR laser measurements.Files
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- Eprint ID
- 3226
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- CaltechAUTHORS:BINieeetas97
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2006-05-23Created from EPrint's datestamp field
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2021-11-08Created from EPrint's last_modified field