TEM MODES IN PARALLEL-LINE TRANSMISSION STRUCTURES

A transmission structure of many parallel conductors is capable of pro pagating many distinct quasi-TEM modes, A field theory of such modes i s developed for a theoretically infinite number of very thin conductor s, These possess infinitely many distinct propagation modes, which are the eigenfunctions of a pair of integral operators with Green's funct ion kernels, The modes depend strongly on the structure cross-sectiona l shape and size, only slightly on the number and placement of individ ual conductors, The theory is illustrated by a structure comprising ma ny thin parallel wires on a dielectric substrate backed by a ground pl ane, whose modal functions and velocity distributions are used to solv e a simple crosstalk problem.