A new 'circuit model' for the conversion between even and odd modes in coplanar waveguide asymmetric shunt impedances is presented. The model is based on the separation of modes into two input and two output ports. In contrast to previous work, it allows a quantitative analysis of the energy exchange between modes.
Miquel, R., Pradell, L. Circuit model for mode conversion in coplanar waveguide assymmetric shunt impedances. "Electronics Letters", Abril 1999, vol. 35, núm. 9, p. 713-715.