用多极理论分析圆柱内导体屏蔽矩形板线的阻抗问题

Multipole Theory Analysis on Characteristic Impedance of Shielded Rectangular Cross-Section Slab-Line with Cylindric lnner Conductors

本文给出用多极理论计算具有圆柱形内导体的各种电（磁）壁屏蔽矩形板线的特性阻抗．通过数学分析，给出其相应的计算公式。通过对多种屏蔽矩形板线的实际计算结果表明：多极理论具有极高的计算精度，是一种非常有效的屏蔽矩形线计算方法，可以很方便地用于屏蔽矩形板线工程问题的设计与计算。

A new method for calculating 2D electrostatic field boundany-value problem-Multipole Theory (MT) method is described. A set of characteristic impedance formulae for rectangular cross-section, magnetic and electric wall type slab- line with cylindric inner conductors is presented by the MT method. By calculating the characteristic impedances of various shielded rectangular cross-section slab-lines with cylindric inner conductors,it is shown that the MT is a more effective approach for the analysis of the shielded rectangular cross-section slab-lines with cylindric inner conductors,it is reliable and may be used to calculate the slab-line engineering problems.