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介绍一种新型开放式毫米波馈电系统——超导准光系统 ,该系统已成功地应用于我国的 1 3.7m口径毫米波望远镜上 ,它工作于 2 .6mm波段 ,已成功进行天文实测和天文研究工作。该系统应用了一个新型 4K低温致冷系统 ,可工作于二个频段。文中详细介绍了该系统的设计理论及研制结果。实测结果表明 ,整个系统的插损在 2 .6mm波段仅 0 .1 d B,这种损耗比起波导系统而言 ,是极其微小的。接收机的系统噪声温度在 85GHz~ 1 1 2 GHz宽带内 ,优于 87.6K。该系统至今已在青海高原使用一年时间 ,目前仍在正常工作。
Introduced a new type of open millimeter-wave feeding system - superconducting quasi-optical system, the system has been successfully applied to China’s 1 3.7m millimeter-wave telescope, which operates in the 2.6mm band, has been successfully astronomical measured And astronomy research work. The system employs a new 4K cryogenic refrigeration system that operates in two frequency bands. The paper introduces the design theory and the result of the system in detail. The measured results show that the insertion loss of the whole system is only 0.1 dB in the 2.6mm band, which is extremely small compared with the waveguide system. The system noise temperature of the receiver is within 85GHz ~ 1 1 2GHz broadband, better than 87.6K. The system has been used for one year in the Qinghai Plateau and is still working normally.