Multiple mixer, cryogenic receiver for 200–350 GHz

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Multiple mixer, cryogenic receiver for 200–350 GHz

机译：多混频器，低温接收器，适用于200–350 GHz

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This paper describes a new 200–350‐GHz dual polarization heterodyne radiometer receiver for radio astronomy applications. The receiver incorporates four pairs of cryogenically cooled Schottky‐barrier diode single‐ended mixers, each pair covering a 30–40‐GHz subband of the full operating band. Each mixer, with its IF amplifier, is mounted in an individual cryogenic subdewar comprising a separate vcuum chamber and a cold stage, which may be readily thermally connected to or disconnected from the main refrigerator by a novel mechanical heat switch. A dual polarization LO diplexer is mounted on a rotary table above the subdewars. For band selection, the two diplexer rf output ports may be positioned over any of the four pairs of subdewars. The SSB receiver noise temperatues achieved are less than 500 K between 200 and 240 GHz, less than 800 K between 245 and 275 GHz and 1500 K at 345 GHz.

机译：本文介绍了一种用于射电天文应用的新型200-350-GHz双极化外差辐射计接收机。接收器包含四对低温冷却的肖特基势垒二极管单端混频器，每对覆盖整个工作频带的30–40 GHz子频带。每个带有其IF放大器的混频器都安装在一个单独的低温子杜瓦瓶中，该子杜瓦瓶包括一个单独的真空腔和一个冷台，可以通过新颖的机械热开关轻松地将其与主制冷机热连接或断开连接。双极化LO双工器安装在子杜瓦瓶上方的转盘上。对于频带选择，两个双工器rf输出端口可以位于四对子杜瓦瓶中的任何一个上。在200和240 GHz之间，SSB接收机的噪声温度小于500 K，在245和275 GHz之间以及在345 GHz时，小于1500K。

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《Review of Scientific Instruments》 |1983年第10期|P.1371-1376|共6页
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Multiple mixer, cryogenic receiver for 200–350 GHz

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