Environment analysis of high-altitude electromagnetic pulse coupling field in cavity with aperture shielding

The electronic system is located in the shielded chamber, but the pulse field environment in the chamber is complicated, and the test environment is difficult to simulate accurately. Therefore, in order to study the high-altitude electromagnetic pulse coupling field environment inside the screened cavity with holes, the pulse field inside the screened cavity with holes is calculated based on the CST electromagnetic simulation software, and the waveforms in the time domain and frequency domain the internal monitoring points are analyzed. The results show that there is main pulse in the pulse field near the hole, and the high frequency component of the high-altitude electromagnetic pulse can basically coupled into the cavity, and the pulse field environment of the coupled cavity is affected by the aperture size, the incidence Angle and the number of holes, etc. The pulse field environment of the coupled into the shielded cavity is different under different backgrounds.