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Title:
A Millimeter-Wave Quasi-Optical Circuit for Compact Triple-Band Receiving System
Authors:
Han, Seog-Tae; Lee, Jung-Won; Lee, Bangwon; Chung, Moon-Hee; Lee, Sung-Mo; Je, Do-Heung; Wi, Seog-Oh; Goldsmith, Paul F.
Affiliation:
AA(Korea Astronomy and Space Science Institute, Daejeon, Yusung-gu, South Korea), AB(Korea Astronomy and Space Science Institute, Daejeon, Yusung-gu, South Korea), AC(Korea Astronomy and Space Science Institute, Daejeon, Yusung-gu, South Korea), AD(Korea Astronomy and Space Science Institute, Daejeon, Yusung-gu, South Korea), AE(Korea Astronomy and Space Science Institute, Daejeon, Yusung-gu, South Korea), AF(Korea Astronomy and Space Science Institute, Daejeon, Yusung-gu, South Korea), AG(Korea Astronomy and Space Science Institute, Daejeon, Yusung-gu, South Korea), AH(Jet Propulsion Laboratory, Pasadena, CA, USA)
Publication:
Journal of Infrared, Millimeter, and Terahertz Waves, Volume 38, Issue 12, pp.1487-1501
Publication Date:
12/2017
Origin:
SPRINGER
Keywords:
Triple-band receiver, Gaussian beam, Quasi-optical circuit, Frequency-independent design, Antenna aperture efficiency
Abstract Copyright:
(c) 2017: Springer Science+Business Media, LLC
DOI:
10.1007/s10762-017-0438-2
Bibliographic Code:
2017JIMTW..38.1487H

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.
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