设计了D波段直接检波式辐射计前端，主要包括D波段检波器模块、D波段低噪声放大器模块和D波段标准增益喇叭天线.基于商用零偏二极管HSCH-9161研制出D波段检波器，测试结果显示在D波段内，最高灵敏度接近1 600 mV/mW，当频率小于140 GHz时，灵敏度大于400 mV/mW，在大于140 GHz频段内，灵敏度优于120 mV/mW.基于自研D波段低噪声放大器芯片研制出D波段低噪放模块，测试结果显示最大增益为10.8 dB@139 GHz，在137~144 GHz频率范围内，增益大于7.8 dB，输入端回波损耗优于5 dB，输出端回波损耗优于8.5 dB.最终搭建D波段直接检波式辐射计前端进行成像实验验证.

A D-band（110~170 GHz） direct detection radiometer front-end which consists of detector module， low noise amplifier module and standard gain horn antenna. The D-band detector is designed and fabricated based on zero-bias Schottky barrier diode HSCH-9161 and the measurement shows that the voltage sensitivity is larger than 400 mV/mW between 110~140 GHz， larger than 120 mV/mW in D-band and the maximal value reaches about 1 600 mV/mW@110 GHz. The D-band LNA module is packaged with self-designed MMIC and the module measurement shows the peak gain is 10.8 dB@139 GHz， the gain higher than 7.8 dB from 137 GHz to 144 GHz， the measured input return loss （S11） and output return loss （S22） are better than -5 dB and 8.5 dB in operating frequencies， respectively. Finally， the imaging experiments based on this front-end are carried out.