Full-Wave Investigation on The Coupling Between Odd and Even Modes in CPW Two-poles Resonators.

This paper presents a full-wave investigation on the coupling between odd and even modes in CPW two-poles resonators from an integral wave-based formulation. Electric field and current density sources are considered and confronted for the excitation of the CPW odd and even modes. The efficiency of a coupling notch introduced to control the coupling ratio between the even and odd modes is rigorously determined. A simple and efficient electromagnetic modelling of Air-bridges, easy to include in a CAD environment, is proposed. The influence of the Air-bridges height, the effect of the position and nature of the exciting sources on the resonant frequencies and on the S-parameters are examined.