D波段辐射计前端的设计与应用

The study and application of D-band radiometer front-end

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1600 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 1600 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.