Research on the Coupling Characteristics of Electromagnetic Pulse of Electronic Equipment

Abstract

The problem of electromagnetic interference is becoming more and more prominent in complex environment, and the study of coupling effect between electronic devices is very important to guide the design of electromagnetic protection. In this paper, CST electromagnetic simulation software is used to study the strong electromagnetic pulse coupling effect of the device chassis and harmonious vibration cavity, to simulate the coupling characteristics of the cavity by square hole seam area and the length of the outer cable in the cavity, and then to study the coupling characteristics of the two coupling methods at the same time through simulation and analysis of the coupling electric field and electromagnetic pulse simulation test. The results show that the larger the hole area, the stronger the field strength of coupling into the cavity, and no effect on the resonant point position in the cavity; The longer the cable, the stronger the field force coupled in the center of the cavity, the resonant frequency in the cavity is basically unchanged; When the two coupling methods exist at the same time, the size of the hole seam is small compared to the wavelength, which makes it difficult for electromagnetic waves to enter the inside of the cavity, mainly as cable coupling, and the other is mainly in the form of hole coupling.