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An Ultra-wide Bandwidth Low-frequency Radio Astronomical Cryogenic Receiver for FAST Telescope

Authors :
Hong-Fei Liu
Peng Jiang
Chuan He
Fan Yang
Hong-Ju Liu
Sheng-Wang Wang
Yang Wu
Yan Zhu
Yang Cao
Jin-You Song
Xiang-Wei Shi
Ming-Lei Guo
Hang Zhang
Wen-Hao Liu
Source :
Research in Astronomy and Astrophysics. 22:115016
Publication Year :
2022
Publisher :
IOP Publishing, 2022.

Abstract

This paper presents an ultra-wide bandwidth (UWB) low-frequency radio astronomical cryogenic receiver for the Five-hundred-meter Aperture Spherical radio Telescope (FAST). It covers 6.6:1 bandwidth from 0.5 to 3.3 GHz. The receiver consists of a Quad-Ridged Flared Horn (QRFH), a cryogenic microwave unit, an optical transceiver and a warm microwave and frequency mixing unit. A QRFH with a concentric-loaded dielectric spear is developed: the average return losses are larger than 20 dB; the average ports polarization isolation is 43.87 dB; the average dish efficiency is higher than 65%. Many UWB cryogenic low loss components are developed for the fabrication of a cryogenic microwave unit. The average noise temperature lower than 14.2 K and 22.5 K are achieved as referred to the input ports of cryogenic Dewar and the output of horn, respectively. Compared to other similar advanced UWB receivers, such as Parkes 0.7–4.2 GHz (6:1 bandwidth) receiver and FAST 0.27–1.62 GHz (6:1 bandwidth) receiver, wider relative bandwidth of the proposed receiver is achieved and it is a new attempt to expand the bandwidth of UWB low-frequency receiver.

Details

ISSN :
16744527
Volume :
22
Database :
OpenAIRE
Journal :
Research in Astronomy and Astrophysics
Accession number :
edsair.doi...........1b85f29884eac2f2836120c7e32d42cf
Full Text :
https://doi.org/10.1088/1674-4527/ac9577