一种用于NRO 45-m Radio Telescope的新型100-GHz波导型双极化边带分离SIS接收机前端系统
A New 100-GHz Band Front-End System with a Waveguide-Type Dual-Polarization Sideband-Separating SIS Receiver for the NRO 45-m Radio Telescope
摘要：
我们开发了一个波导型双极化边带分离SIS接收系统的100 GHz频段的45米射电望远镜在野边山射电天文台，日本。该接收机由一个正交模换能器和两个边带分离的SIS混频器组成，它们都是基于波导技术的。接收机具有4.0- 8.0GHz四个中频频段。在80- 120 GHz的射频范围内，单边带接收机噪声温度为50- 100 K，镜像抑制比大于10 dB。我们为望远镜光束开发了新的匹配光学器件，并为四个IF信号开发了新的IF链。新的接收系统安装在望远镜上，我们成功地同时观测到了12 CO，13 CO和C18 O发射线朝向人马座B2区，以确认接收系统的性能。该系统的SSB噪声温度，包括大气，变成了以前的接收机系统的SSB噪声温度的大约一半。从来自W51巨分子云的12 CO和HCO+光谱计算了两个2SB混频器的镜像抑制比（IRR），导致对于一个偏振> 20 dB，对于另一个偏振> 12 dB。
英文摘要：
We developed a waveguide-type dual-polarization sideband-separating SIS receiver system of the 100-GHz band for the 45-m radio telescope at the Nobeyama Radio Observatory, Japan. This receiver is composed of an ortho-mode transducer and two sideband-separating SIS mixers, which are both based on the waveguide technique. The receiver has four intermediate frequency bands of 4.0--8.0 GHz. Over the radio frequency range of 80--120 GHz, the single-sideband receiver noise temperatures are 50--100 K and the image rejection ratios are greater than 10 dB. We developed new matching optics for the telescope beam as well as new IF chains for the four IF signals. The new receiver system was installed in the telescope, and we successfully observed the 12CO, 13CO and C18O emission lines simultaneously toward the Sagittarius B2 region to confirm the performance of the receiver system. The SSB noise temperature of the system, including the atmosphere, became approximately half of that of the previous receiver system. The Image Rejection Ratios (IRRs) of the two 2SB mixers were calculated from the 12CO and HCO+ spectra from the W51 giant molecular cloud, resulting in > 20 dB for one polarization and > 12 dB for the other polarization.
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