Abstract
The high-altitude nuclear explosion instantly produces a large number of X-rays, which induce air plasma in the metal cavity filter, thus changing the frequency selection characteristics of the filter and affecting the performance of electronic devices. To research these situations, a three-dimensional time-varying plasma model is displayed in a cylindrical metallic cavity under X-rays irradiation, and the electromagnetic wave propagation characteristics at different air pressures and various times are calculated utilizing the shifted operator time domain finite difference (SO-FDTD) method. Furthermore, the change of the frequency selection characteristics for the cavity filter is also analyzed.
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