金属舱近场孔缝耦合特性数值分析

为分析和解决车载天线对舱内电子设备电磁干扰的问题,建立了全尺寸金属舱模型,运用基于时域有限积分法的商业软件CST,重点分析了孔口形状、开孔与辐射源的间距及相对位置对孔缝近场耦合特性的影响,并对比了典型孔缝结构所造成的近场电磁泄漏,系统建立了孔口形状、开孔与辐射源的间距、相对位置以及孔缝结构类型等4个因素与孔缝近场耦合强度之间的数值关系。所得结论有利于指导车载天线及舱内设备的布局。

Numerical analysis of near-field coupling characteristics of metallic cavity with apertures

In order to analyze and solve the EMI(Electromagnetic Interference) from the vehicle-borne antennas to the electronic equipment in the module, a full-scale model of metal cabin is constructed. The CST, a commercial software based on the FITD(Finite-integration Time-Domain) method, is employed to analyze the influences on the characteristics of near-field, which is produced by the shape of aperture, the distance and relative location between the radiator and aperture. The near-field electromagnetic leakage caused by different kinds of typical apertures is also simulated. Numerical relationships between the strength of aperture coupling and four elements(the shape and structure of aperture, the distance and relative location between the radiator and aperture) are built. The conclusions are helpful to provide guidance for the arrangements of vehicle-borhe antennas and electronic equipment in metal cabin.