基于立方星辐射计直接检波系统,设计并实现了中心频率分别为89 GHz和150 GHz的两款毫米波零偏置肖特基检波器.检波器设计基于ACST的零偏置肖特基二极管.为了获得稳定、优越的性能以及较好的宽带特性,并易于与前级系统集成,更适于立方星辐射计小型化,在直流接地电路与输出电路处采用扇形线结构,并通过一段可调传输线对其端口阻抗进行优化.本文对肖特基二极管及检波器电路结构进行了分析、建模和优化.测试结果表明,W波段检波器在85～95 GHz范围内具有2500 V/W的典型灵敏度,在89 GHz测试的线性度为0.9994.D波段检波器在145～155 GHz范围内的典型灵敏度约为1600 V/W,在150 GHz测试的线性度为0.9992.这些结果验证了改进电路结构在检波器设计上的优越性和在直接检波系统中应用的可行性.“,”In this paper,two millimeter-wave zero-bias Schottky detectors for the direct detection system of the CubeSat radiometer,with center frequencies of 89 GHz and 150 GHz,respectively,were designed and imple?mented. These designs were based on zero-bias Schottky diodes of ACST. A radial stub structure was adopted at the DC ground and output port with a tuning line for optimum impedance matching to achieve stable and high per?formance and broadband characteristics;this structure also makes the circuit easier to integrate with pre-level sys?tems and more suitable for CubeSat radiometer miniaturization. Circuit structure and Schottky diode were ana?lyzed,modeled,and optimized to obtain better performance. The results showed that the W-band detector has a typical sensitivity of about 2500 V/W in the range of 85 GHz to 95 GHz and a linearity of 0. 9994 at 89 GHz. Moreover,the D-band detector has a typical sensitivity of about 1600 V/W in the range of 145 GHz to 155 GHz and a linearity of 0. 9992 at 150 GHz. These results verified the advantages of the improved circuit structure in the detector and the feasibility of the direct detection system.