A Novel Even & Odd-Mode Symmetric Circuit Decomposition Method

This paper presents a novel method using the principles of even-odd mode analysis to derive the scattering parameters of the even-mode and odd-mode circuit decompositions of a symmetric circuit solely from its known scattering parameters. This eliminates the need for the microwave designer to perform additional simulations to obtain the even-mode and odd-mode circuits once the full circuit S-parameters are known. The technique is especially attractive in the case of Monolithic Microwave Integrated Circuit (MMIC) design where the additional simulations typically require a EM (3D) simulator. The utility of the method is highlighted by analyzing the odd-mode circuit of a MMIC PA power combiner.