In complex electromagnetic countermeasure environments,it is necessary to take electromagnetic protection measures for the radio frequency front-end of electronic information equipment to resist strong electromagnetic interference and even damage.In response to the problem that existing protective devices reflect strong interference signals exceeding the threshold during operation,which can easily cause secondary electromagnetic threats,we propose a design for a broadband absorptive electromagnetic pulse protection device.By introducing a microstrip line matching stub in the main protection path,the electromagnetic pulse signal is isolated from the output port and transmitted to the matching load for broadband absorption.Within the frequency range of 0.5 GHz to 1.5 GHz(relative bandwidth＞90％),the device achieves good performance with insertion loss less than 1 dB for low-power signals,electromagnetic pulse signal protection isolation greater than 10 dB,and input port return loss greater than 10 dB.
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