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

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.