低温接收机是深空探测地面应用系统的重要组成部分,深空测控距离遥远,需要挖掘一切潜力提高地面设备的接收能力。带圆极化网络制冷技术对改善深空系统接收品质因素G/T作用明显。提出了圆极化网络制冷的X/Ka双频低温接收前端设计的若干关键技术,并给出样品研制测试结果。测试结果表明,X频段低温接收前端噪声温度小于20K,Ka频段低温接收前端噪声温度小于30K。 Cryogenic receiver is an important part of deep space exploration ground application system. Deep space observation and control distance is far away, and all potential needs to be tapped to improve the receiving capability of ground equipment. With circular polarization network cooling technology to improve the reception quality of deep space system G / T obvious role. Some key technologies of X / Ka dual-frequency low-temperature receiver front-end design for circularly polarized network cooling are proposed, and the test results of sample development are given. The test results show that the front-end noise temperature of the low-temperature X-band receiver is less than 20K, and the low-temperature front-end noise temperature of the Ka-band receiver is less than 30K.