Capacitive discontinuities: rigorous multimode equivalent network representation

Rigorous multimode equivalent network representations for a variety of zero-thickness capacitive windows and obstacles in a parallel-plate waveguide are presented. A key feature of these representations is that the coupling between all of the modes excited is described by a matrix whose elements do not depend on frequency. The value of the results presented is that the networks developed can be used to analyze rigorously a large variety of single and coupled planar transmission line structures, including radiation effects.<>