Development of an SIS(Superconductor-Insulator-Superconductor) Junction Mixer over 120∼180 GHz Band

120∼180 GHz 대역 SIS (Superconductor-Insulator-Superconductor) 접합 믹서의 개발

  • Chung, Moon-Hee (Taeduk Radio Astronomy Observatory) ;
  • Lee, Changhoon (Taeduk Radio Astronomy Observatory) ;
  • Kim, Kwang-Dong (Taeduk Radio Astronomy Observatory) ;
  • Kim, Hyo-Ryoung (Taeduk Radio Astronomy Observatory)
  • Published : 2004.08.01

Abstract

A fixed-tuned SIS(Superconductor-Insulator-Superconductor) mixer across 120∼180 GHz band has been developed. This mixer employs an SIS chip fabricated by Nobeyama radio observatory which consists of a series array of 6 Nb/Al-Al$_2$O$_3$/Nb junctions in a microstrip line on a fused quartz substrate. The SIS chip is placed at the center of the half-height waveguide mixer mount to have a good incoming signal coupling over the whole frequency band. No mechanical tuner was used in the SIS mixer and the RF signal and local oscillator power are injected to the mixer via a cooled cross-guide coupler. In order to prevent the IF signal loss, the If output impedance of the SIS mixer was matched to the 50 $\Omega$ input impedance of the IF chain. Measured double sideband noise temperatures of a receiver using the SIS mixer are 32∼131 K over 120∼180 GHz band. The developed SIS mixer is now in use for radio astronomical observations on the TRAO 14 m radio telescope.

Keywords

SIS Junction;Millimeter-Wave Mixer;Heterodyne Receiver;Radio Astronomy

References

  1. IEEE J. Quantum Electron. v.15 Quantum limited detection in tunnel junction mixers J. R. Tucker https://doi.org/10.1109/JQE.1979.1069931
  2. Proceedings of the IEEE v.80 no.11 Submillimeter receivers for radio astronomy R. Blundell;C. E. Tong https://doi.org/10.1109/5.175250
  3. private communication T. Noguchi
  4. IEEE Trans. Microwave Theory Tech. v.42 Two-junction tuning circuits for submillimeter SIS mixers J. Zmuidzinas;H. G. LeDuc;J. A. Stern;S. R. Cypher https://doi.org/10.1109/22.285084
  5. IEEE Trans. Microwave Theory Tech. v.43 A wide band fixed-tuned SIS receiver for 200 GHz operation R. Blundell;C. E. Tong;D. C. Papa;R. L. Leombruno;X. Zhang;S. Paine;J. A. Stern;H. G. LeDuc https://doi.org/10.1109/22.375257
  6. IEEE MTT-S Int. Microwave Symp. Dig. Understanding the waveguide diode mount R. L. Eisenhart
  7. IEEE Trans. Microwave Theory Tech. v.23 Low-noise room-temperature and cryogenic mixers for 80-120 GHz A. R. Kerr https://doi.org/10.1109/TMTT.1975.1128683
  8. IEEE Trans. Microwave Theory Tech. v.40 A low noise 230 GHz heterodyne receiver employing .25 ${\mu}m^2$ area Nb/$ALO_x$/Nb tunnel junctions J. W. Kooi;M. Chan;T. G. Phillips;B. Bumble;H. G. LeDuc https://doi.org/10.1109/22.137383
  9. Int. J. Infrared and Millimeter Waves v.11 no.1 A scale mixer model for SIS waveguide receivers T. H. Buttgenbach;T. D. Groesbeck;B. Ellison
  10. IEEE Trans. Microwave Theory Tech. v.42 A technique for noise measurement of SIS receivers Q. Ke;M. J. Feldman https://doi.org/10.1109/22.285091
  11. IEEE Trans. Microwave Theory Tech. v.33 85~115 GHz receivers for radio astronomy D. P. Woody;R. E. Miller;M. J. Wengler https://doi.org/10.1109/TMTT.1985.1132955