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http://dx.doi.org/10.5303/PKAS.2012.27.3.071

129 GHz SIS MIXER RECEIVER FOR KOREAN VLBI NETWORK  

Lee, Jung-Won (Korea Astronomy and Space Science Institute)
Wang, Ming-Jye (Institute of Astronomy and Astrophysics, Academia Sinica)
Li, Chao-Te (Institute of Astronomy and Astrophysics, Academia Sinica)
Chen, Tse-Jun (Institute of Astronomy and Astrophysics, Academia Sinica)
Kim, Soo-Yeon (Korea Astronomy and Space Science Institute)
Lu, Wei-Chun (Institute of Astronomy and Astrophysics, Academia Sinica)
Kang, Yong-Woo (Korea Astronomy and Space Science Institute)
Shi, Sheng-Cai (Purple Mountain Observatory, Chinese Academy of Science)
Han, Seog-Tae (Korea Astronomy and Space Science Institute)
Publication Information
Publications of The Korean Astronomical Society / v.27, no.3, 2012 , pp. 71-80 More about this Journal
Abstract
We have developed superconducting mixer receivers for 129 GHz VLBI observation in Korean VLBI Network (KVN). The developed mixer has a radial waveguide probe with simple transmission line L-C transformer as a tuning circuit to its 5 series-connected junctions, which can have 125 - 165 GHz as the operation radio frequency (RF). For intermediate frequency (IF) signal path a high impedance quarter-wavelength line connects the probe to one end of symmetric RF chokes. The double side band (DSB) receiver noise of the mixer was about 40 K over 4 - 6 GHz IF band, whereas we achieved the uncorrected single side band (SSB) noise temperature of about 70 K and better than 10 dB image rejection ratio in 2SB configuration with 8 - 10 GHz IF band. Insert-type receiver cartridges employing the mixers have been under commission for KVN stations.
Keywords
detectors; SIS mixer receiver; instrumentation; Korean VLBI Network;
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