QuasiTEM analysis of microwave transmission lines by the finite element method
Abstract
This paper describes a finite element approach to quasiTEM analysis of several different types of isolated and coupled microwace transmission lines. Both the first and higherorder ordinary elements, as well as singular and infinite elements are used to solve for the potential and field distribution in the crosssection of the line. Next, the crosssectional field distribution is inserted in a variational expression to compute the capacitance per unit length of the line and the effective permittivity and characteristic impedance of the line are obtained from the capacitance value. A perturbationl approach is developed for estimating the losses due to conductor and dielectric dissipation and computing the attentuation constant. Lines treatable by this method may contain an arbitrary number of arbitrarily shaped conductors, including a system of conductors either placed above a single ground plane or between two parallel ground planes, and inhomogeneous dielectric regions that can be approximated locally by a number of homogeneous subregions.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 February 1986
 Bibcode:
 1986STIN...8626533P
 Keywords:

 Finite Element Method;
 Microwave Transmission;
 Millimeter Waves;
 Transmission Circuits;
 Transmission Lines;
 Transmission Loss;
 Capacitance;
 Dielectric Properties;
 Digital Systems;
 Electric Conductors;
 Impedance;
 Electronics and Electrical Engineering