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The Korean Astronomical Society (한국천문학회)
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129 GHz SIS MIXER RECEIVER FOR KOREAN VLBI NETWORK

한국우주전파관측망 129 GHz 초전도 믹서 수신기

  • 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)
  • Received : 2012.03.26
  • Accepted : 2012.06.18
  • Published : 2012.07.31
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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.

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References

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