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A Rigorous Field Treatment for Multiport Waveguide Discontinuities

A rigorous field treatment for multiport waveguide discontinuities is presented in this article. This approach is a combination of the mode expansion method and finite element method, which is based on the weak form of the Helmholtz equation. Mode expansion is used other than PML (perfectly matched layers) to truncate the computing space of finite element. Multiport waveguide structures such as E-plane tee, E-H tee, and H-plane tee with a partial-height conducting post are studied as examples. Calculated results of these structures are shown and compared, respectively, to those in references. Good agreement has been observed.