An Absorbing Boundary Condition for Quasi-TEM Analysis of Microwave Transmission Lines via the Finite Element Method

Open microwave transmission line structures are analyzed in this paper in the quasi-TEM regime using the finite element method. An absorbing boundary condition (ABC) for an arbitrary outer boundary is introduced for the purpose of truncating the unbounded region surrounding the transmission line in an efficient manner. The application of the boundary condition is illustrated for three different microstrip line configurations, viz., a single line, two coupled lines, and a six-conductor line. Numerical results are compared with those published elsewhere and good agreement is found.

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