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

Research in Astronomy and Astrophysics, ISSN: 1674-4527, Vol: 22, Issue: 11
2022
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Article Description

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.

Bibliographic Details

Hong Fei Liu; Peng Jiang; Yan Zhu; Yang Cao; Jin You Song; Xiang Wei Shi; Ming Lei Guo; Hang Zhang; Wen Hao Liu; Chuan He; Sheng Wang Wang; Fan Yang; Yang Wu; Hong Ju Liu

IOP Publishing

Physics and Astronomy; Earth and Planetary Sciences

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