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An improved method for tracking of Characteristic Modes

The Theory of Characteristic Modes (CM) provides a powerful tool of analyzing the radiators, which exhibits the orthogonality of basis radiation patterns. The properties of CM can be exploited by eigenvalues and eigenvectors solved by the general eigenvalue equation formulated from the Method of Moments impedance matrix. So the CM is parameterized by frequency, the tracking of which can reveal the bandwidth of the structure. The existing approach of tracking modes is mainly based on correlation of quantities such as eigenvectors and far fields and that is susceptible to the fine level of mesh discretization and the length of frequency increment step. The improved method proposed in this paper increases the accuracy of tracking approach; the results show that faults are corrected by the improved method.