Journal of the Korean Institute of Telematics and Electronics A (전자공학회논문지A)

The Institute of Electronics and Information Engineers (대한전자공학회)
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The design of 85GHz-115Ghz band SIS mixer for the observing cosmic radio waves

85GHz-115Ghz 대 우주전파 관측용 초전도체 믹서 설계

  • 한석태 (천문대. 대덕전파전문대) ;
  • 김효령 (천문대. 대덕전파전문대) ;
  • 이창훈 (천문대. 대덕전파전문대) ;
  • 박종애 (이화여자대학교 물리학과) ;
  • 정현수 (천문대. 대덕전파전문대) ;
  • 김광동 (천문대. 대덕전파전문대) ;
  • 김태성 (천문대. 대덕전파전문대) ;
  • 박동철 (충남대학교 전파공학과)
  • Published : 1996.06.01
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Abstract

We have evaluated the theoretical conversion loss and noise temperature of mixer using the quantum mixer theory and the method to determine the embedding impedance of waveguide-type mixer mount. At fixed backshort position of the mixer, the calculated SSB mixer conversion loss and mixer noise temperature are 5 dB and 10K within frequency range form 85 GHz to 115 GHz, respectively. The SIS mixer has been developed by using through on the calculated rsutls to observe cosmic radio waves. SIS junction of mixer is Nb/Al-AlOx/Nb and it consists of four series array. Area of each of junction is about 2.5${\mu}m^{2}$. The average receiver noise temperature of manufactured receiver with this mixer is about 30 K(DSB). The receiver noise temperature is much lower than that of receiver with a mixer using mechanical tuning backshort.

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