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辐射计是一种用于测量物体热辐射的高灵敏度接收机,是被动微波遥感的主要工具。辐射计前端作为辐射计系统的重要组成部分,其性能直接影响系统的指标。本文介绍一种380GHz辐射计前端关键技术的设计,包括380GHz分谐波混频器及作为本振驱动的190GHz三倍频器。其中380GHz分谐波混频器在2.5~3.5GHz中频输出频率范围内实测变频损耗低于10d B,均值为9d B;等效噪声温度达到1300K,均值约为2000K。190GHz三倍频器已完成仿真设计,在190GHz频率点倍频效率大于25%,输出功率约18m W,在183~193GHz的频带范围内,输出功率大于5m W。
Radiometer is a kind of high sensitivity receiver used to measure the thermal radiation of objects, which is the main tool of passive microwave remote sensing. Radiometer front-end as a radiometer system, an important part of its performance directly affects the system’s indicators. This article describes the design of a 380GHz radiometer front-end key technologies, including the 380GHz sub-harmonic mixer and 190GHz TFR drive as a local oscillator. Among them 380Hz subharmonic mixer in 2.5 ~ 3.5GHz intermediate frequency output frequency range of the measured frequency loss less than 10d B, the average value of 9d B; equivalent noise temperature reached 1300K, the average value of about 2000K. The 190GHz triplexer has been emulated and designed with a frequency doubling efficiency of more than 25% at 190GHz and an output power of approximately 18mW, with an output power of more than 5mW in the 183 to 193GHz frequency band.