With the increasing threat of extremely difficult environment of communication system

the electromagnetic pulse protection module which has the characteristics of high power capacity

high isolation

low insertion loss and fast response time is becoming increasingly important.In this paper

the principle of radio frequency limiting of PIN is studied

and the structure of passive multistage PIN diode is adopted.Through the establishment of its field simulation model

the corresponding S parameters are extracted

and the optimal matching network is optimized.The electromagnetic pulse protection module which works at 0~200MHz has insertion loss of less than 0.15dB

the voltage standing wave ratio (VSWR) of less than 1.4

response time of less than 1ns is designed.Combined with self-built PIN diode model

ADS simulation software is used to simulate the limiting performance of electromagnetic pulse protection module.The result shows that all the indexes meet the requirements.