ABSTRACT
Multiconductor transmission lines (MTL), or multiconductor buses as they are also often called, are found in almost every electrical packaging technology and on every technology level from digital chips, over MMICs (monolithic microwave integrated circuits) to MCMs (multichip modules), boards, and backplanes. Multiconductor transmission lines are electrical conducting structures with a constant crosssection (the
x
,
y
-plane) which propagates signals in the direction perpendicular to that cross-section (the
z
-axis) (see also Fig. 42.1). Being restricted to a constant cross-section we are in fact dealing with the socalled uniform MTL. The more general case using a nonuniform cross-section is much more difficult to handle and constitutes a fully three-dimensional problem.
