Research on MEMS dual-channel microwave power sensor with fixed beam structure

To improve the sensitivity and dynamic range of microwave power sensors, a micro-electromechanical system (MEMS) dual-channel microwave power sensor is proposed in this study. The sensor is designed and manufactured using the GaAs monolithic microwave integrated circuit` (MMIC) process and MEMS technology. The microwave performance, overload power and sensitivity are theoretically studied. At 8-12 GHz, the return loss of the sensors with three different fixed beam sizes are approximately -10 dB, which is good microwave performance. The sensitivities for capacitive detection channel of the two sensors with larger sizes are 2.4 fF W-1 @10 GHz and 14.5 fF W-1 @10 GHz, respectively, and the sensitivities of the thermoelectric detection channel of the three sensors is 25.7 mV W-1, 24.9 mV W-1 and 24.2 mV W-1, respectively. Compared with traditional microwave power sensors, the sensor proposed takes into account the advantages of microwave power sensors in both thermoelectric and capacitive structures. This work helps lay the foundation for the design of microwave power sensors with a fixed beam structure and thermoelectric microwave power sensors.