用边界元法分析圆柱内导体屏蔽矩形板线的特性阻抗

Boundary Element Method on Characteristic Impedance of Shielded Rectangular Line with Cylindrical Inner Conductors

由多根圆柱内导体和矩形外导体所组成的屏蔽矩形板线是电磁工程中一类重要的传输线。文章提出用边界元法分析多圆柱内导体屏蔽矩形板线的特性阻抗问题 ,推导出用边界元法计算多圆柱内导体屏蔽矩形板线的自电容、耦合电容计算公式。通过对两类屏蔽矩形板线的实际计算结果表明 :边界元法具有较高的计算精度 ,是一种有效的多圆柱内导体屏蔽矩形板线分析方法 。

The shielded rectangular cross section slab line with cylindrical inner conductors is of great importance to microwave engineering and design.In this paper,boundary element method(BEM) is applied to calculating the characteristic impedance of the shielded rectangular line with multi cylindrical inner conductors.The computational formulations of the self capacitance and coupling capacitance is derived.The accuracy of the impedance data is confirmed by comparing the numerical results reported in the literature.It has been shown that the BEM is an effective method for the analysis of the shielded rectangular cross section slab line with the cylindrical inner conductors,it is reliable and may be used to calculate the slab line engineering problems.