{"id":4567,"date":"2019-09-08T16:18:05","date_gmt":"2019-09-08T14:18:05","guid":{"rendered":"https:\/\/www.oa-cagliari.inaf.it\/seminari\/un-ricevitore-criogenico-in-banda-q-per-il-tmrt-e-il-laboratorio-di-tecnologia-a-microonde-dello-shao\/"},"modified":"2025-09-22T23:04:46","modified_gmt":"2025-09-22T21:04:46","slug":"un-ricevitore-criogenico-in-banda-q-per-il-tmrt-e-il-laboratorio-di-tecnologia-a-microonde-dello-shao","status":"publish","type":"seminari","link":"https:\/\/www.oa-cagliari.inaf.it\/en\/seminars\/un-ricevitore-criogenico-in-banda-q-per-il-tmrt-e-il-laboratorio-di-tecnologia-a-microonde-dello-shao\/","title":{"rendered":"A Q-band cryogenic receiver for the TMRT and microwave technology lab of SHAO"},"content":{"rendered":"

\"\"<\/p>\n

A Q-band two-beam cryogenic receiver for the Tianma radio telescope (TMRT) has been developed, and it uses the independently-developed key microwave and millimeter-wave components operating from 35 to 50 GHz with a fractional bandwidth of 35%. The Q-band receiver consists of three parts: optics, cold unit assembly, and warm unit assembly, and it can receive simultaneously the left-hand and right-hand circularly polarized waves. The cold unit assembly of each beam is composed of a feed horn, a noise injection coupler, a differential phase shifter, an orthomode transducer, and two low-noise amplifiers, and it works at a 20 K temperature zone to greatly improve the detection sensitivity of the receiving system. The warm unit assembly includes four radio-frequency amplifiers, four radio-frequency high-pass filters, four waveguide biased mixers, four 4-12 GHz intermediate-frequency amplifiers and one 31-38 GHz frequency synthesizer. The measured Q-band four-channel receiver noise temperatures are roughly 30-40 K. In addition, the single-dish spectral line and international very long baseline interferometry (VLBI) observations between the TMRT and East Asia VLBI Network at Q-band have been successfully carried out, demonstrating the advantages of the TMRT equipped with the state-of-the-art Q-band receiver. In addition, the facility of our microwave technology lab will be briefly introduced.<\/p>\n","protected":false},"template":"","class_list":["post-4567","seminari","type-seminari","status-publish","hentry","categorie_seminari-colloquium"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/seminari\/4567","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/seminari"}],"about":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/types\/seminari"}],"wp:attachment":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/media?parent=4567"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}