研究了金属腔内电磁场与单导线耦合对线两端部件产生干扰的敏感性问题。利用并矢格林函数计算腔内场分布,利用Agrawal模型计算获得导线两端负载的干扰响应,从腔体尺寸、内部干扰源位置及导线位置三个方面分析了建模的微小变化对导线负载干扰的影响。结果表明,腔体尺寸的微小变化会带来负载干扰响应的很大变化,在谐振点处该影响尤其明显; 腔内干扰源位置的微小变化可能会带来负载干扰响应的巨大变化; 干扰响应对导线距离金属腔壁高度的微小变化不敏感,但单导线位置的微小变化可能带来负载干扰的较大变化。

The susceptibility of field coupling to transmission line inside a rectangular metallic enclosure is investigated. Dyadic Green function is used to calculate the electromagnetic field distribution inside the enclosure, and Agrawal-model is used to obtain the current induced on a single wire due to field coupling. Then, influences on the induced current resulted from the perturbations of the enclosure dimensions, the position of the electromagnetic interference source and the position of the single wire are discussed. The results show that the slight variation of both enclosure dimension size and interference source position may greatly influence the disturbance on terminal loads. Moreover, the disturbance on the load is susceptible to the change of the endpoints position of the wire, while it is insensitive to the slight variation of height above the metallic wall.