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

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 compensati...

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Bibliographic Details
Published inJournal of infrared, millimeter and terahertz waves Vol. 38; no. 12; pp. 1487 - 1501
Main Authors Han, Seog-Tae, Lee, Jung-Won, Lee, Bangwon, Chung, Moon-Hee, Lee, Sung-Mo, Je, Do-Heung, Wi, Seog-Oh, Goldsmith, Paul F.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.12.2017
Springer Nature B.V
Subjects
Apertures
Broadband
Circuit design
Classical Electrodynamics
Cryostats
Electrical Engineering
Electronics and Microelectronics
Engineering
Frequencies
Instrumentation
Millimeter waves
Variations
Very long base interferometry
Frequency-independent design
Quasi-optical circuit
Gaussian beam
Triple-band receiver
Antenna aperture efficiency
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Summary: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.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-017-0438-2