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A Millimeter-Wave Quasi-Optical Circuit for Compact Triple-Band Receiving System

  • Seog-Tae Han
  • Jung-Won Lee
  • Bangwon Lee
  • Moon-Hee Chung
  • Sung-Mo Lee
  • Do-Heung Je
  • Seog-Oh Wi
  • Paul F. Goldsmith
Article
  • 236 Downloads

Abstract

A novel receiver optical system designed for Korean VLBI Network (KVN) has been used for conducting simultaneous millimeter-wave very long baseline interferometry (VLBI) observations at frequencies of 22, 43, 86, and 129 GHz. This multi-frequency band receiver system has been effective in compensation of atmospheric phase fluctuation by unique phase referencing technique in mm-VLBI observations. However, because the original optics system incorporated individual cryogenic receivers in separate cryostats, a rather bulky optical bench of size about 2600 mm x 2300 mm x 60 mm was required. To circumvent difficulties in installation and beam alignment, an integrated quasi-optical circuit incorporating a more compact triple-band receiver in single cryostat is proposed in this paper. The recommended frequency bands of the improved triple-band receiver are K(18–26 GHz) band, Q(35–50 GHz) band, and W(85–115 GHz) band. A frequency-independent quasi-optical circuit for triple band is adopted to obtain constant aperture efficiency as a function of the observed frequencies. The simulation results show that total aperture efficiency of each recommended frequency band is maintained almost constant within 1%. We present the design details of the compact wideband quasi-optical circuit and the triple-band receiver optimized for simultaneous multi-frequency observations.

Keywords

Triple-band receiver Gaussian beam Quasi-optical circuit Frequency-independent design Antenna aperture efficiency 

Notes

Acknowledgements

This work was carried out in part at the Jet Propulsion Laboratory, which is operated for NASA by the California Institute of Technology.

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  • Seog-Tae Han
    • 1
  • Jung-Won Lee
    • 1
  • Bangwon Lee
    • 1
  • Moon-Hee Chung
    • 1
  • Sung-Mo Lee
    • 1
  • Do-Heung Je
    • 1
  • Seog-Oh Wi
    • 1
  • Paul F. Goldsmith
    • 2
  1. 1.Korea Astronomy and Space Science InstituteDaejeonSouth Korea
  2. 2.Jet Propulsion LaboratoryPasadenaUSA

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