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
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85142084727&origin=inward; http://dx.doi.org/10.1088/1674-4527/ac9577; https://iopscience.iop.org/article/10.1088/1674-4527/ac9577; https://dx.doi.org/10.1088/1674-4527/ac9577; https://validate.perfdrive.com/fb803c746e9148689b3984a31fccd902/?ssa=8d6868e6-418f-4a56-b157-658020036c03&ssb=27206205200&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1088%2F1674-4527%2Fac9577&ssi=ed571cb9-8427-4407-8faf-a142996c47bb&ssk=support@shieldsquare.com&ssm=8618077579785131241023347075057562&ssn=c44e005b83197b8b1ffef1609cd62086a2f353a20516-5a6c-4000-acf1a9&sso=29090bb8-6584f8c70db3edda38ee1c401433055b5b68a1fa34e19352&ssp=51328725031722623831172286463629003&ssq=46204151998875396038992734853276701992186&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJyZCI6ImlvcC5vcmciLCJ1em14IjoiN2Y5MDAwMjUwNTQzYzEtODVjOC00OWE3LTk2Y2QtMzFlMTdjMzA2ZTkzMy0xNzIyNjkyNzM0NDEwMTI3MjUzNjI5LTM0OTRmZTIwZTQ0MzcwMWY0MTAyIiwiX191em1mIjoiN2Y2MDAwZTJkY2UxYTMtNGQ0YS00MTBjLWI5NjYtM2ZiMTg0NzYzZmIyMTcyMjY5MjczNDQxMDEyNzI1MzYyOC01MjMxYzU4ZWViNGE0ZGI0NDEwMiJ9; http://sciencechina.cn/gw.jsp?action=cited_outline.jsp&type=1&id=7353978&internal_id=7353978&from=elsevier
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