Fig. 1. Q band SSPA: (a) function diagram, (b) 3-D model of Q band SSPA, (c) photograph of material object

Fig. 2. The prototype and corresponding gain and power distribution of Q band SSPA millimeter wave circuit: (a) prototype, (b) the gain and power distributions of every stage

Fig. 3. Q band broadband power divider/combiner (4 ways)

Fig. 4. Q band SSPA thermal simulation and infrared thermography: (a) shell temperature of the GaN MMICs, (b) heat flux at bottom

Fig. 5. Q band SSPA millimeter wave circuit structure: (a) integrated structure, (b) explosion figure

Fig. 6. DC/DC power supply for Q band SSPA (a) topology diagram, (b) output voltage serious simulation results, (c) efficiency vs. 20 V’s current (main power consumption part)

Fig. 7. Q band SSPA measurement results (a) output power and gain vs. frequency, (b) efficiency at rated input power vs. frequency, (c) gain and output power vs. input power, (d) efficiency vs. input power

Fig. 8. V band 1 to 8/8 to 1 divider/combiner simulation model and results (a) simulation model, transition and reflections simulation results, (b) transition coefficient, (c) reflection of divide ports, (d) isolation between divide ports

Fig. 9. End stage of V band SSPA (a) design structure (model and explosive), (b) fabricated V band end stage SSPA (Input side; GaN MMICs units and output side)

Fig. 10. V band SSPA product and measured results (a) photograph, (b) measurement results

Fig. 11. W band SSPA millimeter wave circuit (a) millimeter wave circuit schematic, (b) integration structure and explosion figure

Fig. 12. W band magic T model and simulation result (a) model and transmission coefficient, (b) reflection and isolation coefficient

Fig. 13. Power supplier circuit schematic and efficiency curve (a) schematic, (b) output voltage serious, (c) efficiency vs. 15 V’s current (main power consumption part)

Fig. 14. W band SSPA photograph and measurement results (a) photograph, (b) measurement results

Fig. 15. V band SSPA and W band SSPA of references (a) V band SSPA of Ref. [6], (b) W band SSPA of Ref. [19]