Research and Design of Broadband High Power Limiter

In this paper, a semi-active limiter in the 6~18GHz frequency band is designed. The limiter adopts a two-stage cascade design. The front-stage limiter uses a silicon-based diode to ensure the power capacity of the entire circuit. The final-stage limiter uses a GaAs diode to increase isolation and ensure fast response speed. The miniaturized broadband coupler is optimized by simulation, and the broadband coupling function is realized in a smaller size. Finally, the power tolerance capability of the limiter is analyzed, and the thermal distribution of the diode is simulated by software.