A hybrid MoM-SPICE technique for field coupling analysis of transmission lines in presence of complex structures

A computationally efficient method for field coupling on multiconductor transmission lines near complex structures is proposed. Key to the method is the decomposition of the current on each transmission line into push-push and push-pull mode currents. The former accounts for the interactions between the transmission line bundle and the surrounding structure, whereas the latter corresponds current perturbation to account for interactions among the transmission lines within the bundle. The push-pull mode current is computed via the traditional transmission line approach by taking one of the wires in the bundle as the return/reference conductor. On the other hand, the push-push mode current is found by solving a test wire located along the reference transmission line in the presence of the surrounding structure. For this analysis, the surrounding structure is modeled via the method of moments and SPICE-like simulator is used to simulate an equivalent coupling circuit model of the transmission lines extracted via the partial element equivalent circuit (PEEC) method