Fig. 1. (a) The split-block module with MMIC, (b) the photo of the LNA module

Fig. 2. LNA packaged measured S-parameters, on-chip S21

Fig. 3. Schematic diagram of D-band detector

Fig. 4. Small signal linear model of HSCH-9161

Fig. 5. (a) Simulation model of input waveguide to microstrip, and (b) the simulated result

Fig. 6. (a)Simulation model of low pass filter, and (b) the simulated result

Fig. 7. Photo of the detector

Fig. 8. Diagram of sensitivity measurement setup for detector

Fig. 9. The measured sensitivity of the detector

Fig. 10. Principle of imaging experimental

Fig. 11. Photo of the measurement setup

Fig. 12. Imaging result of the radiometer front-end without LNA

Fig. 13. Imaging result of the radiometer front-end with LNA