Analysis on the effect of metal penetrating depth into the anisotropic substrate in a shielded microstripline

This article describes the quasistatic analysis of a shielded microstriplin e with finite metallization thickness penetrating into the anisotropic subs trate. A vertical directional mode-matching method, which includes eigenfun ctions with inhomogeneous properties for analyzing this structure, has been used. This method not only provides a simple and fast approach to the quas istatic analysis of inhomogeneous structures, but also can be applied to an alyze the effect of metal penetration into the anisotropic substrate. The r esults show that the characteristic impedances of a shielded microstripline can be represented as a function of the ship width, the metal thickness, a nd the metal penetrating depth into the substrate. (C) 1999 John Wiley & So ns, Inc.