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A rigorous new solution, based on fringing capacitances and conformal mapping, is presented for the coupling problem in the parallel-coupled TEM transmission-line structure formed by two rectanguIar bars coupled through a rectangular slot, cut Iongitudinatly in a finite-thickness ground plane. The conformal mapping solution is summarized in Appendix I and is based on the procedure published by Getsinger . Graphs of the capacitances needed to calculate the coupling for a given physicat geometry, without solving the complicated equations associated with the theoretical solution, are also presented. A measurement procedure and experimental results are presented which verify the accuracy of the theoretical coupling data.
Microwave Theory and Techniques, IEEE Transactions on (Volume:32 , Issue: 1 )
Date of Publication: Jan 1984