Fig. 1. Schematic diagram of the detection circuit.

Fig. 2. Simplified diode equivalent model.

Fig. 3. Simulated circuit diagram of the designed detection unit circuit for 26.5 GHz–40.0 GHz.

Fig. 4. Simulated results: (a) SWR and (b) output voltage.

Fig. 5. Output voltage curve as a function of temperature.

Fig. 6. Schematic diagram of the designed temperature compensation circuit.

Fig. 7. Pictures of the designed module: (a) internal layout diagram and (b) outline drawing.

Fig. 8. Results of the three-temperature test.