A novel surface integral equation (SIE)-based theory of characteristic modes (TCM) for arbitrarily shaped N lossy/lossless penetrable objects and N perfect electric conductors (PECs) is proposed in this letter. Compared to previous work, the novel SIE-based generalized eigenvalue equation (GEE) is valid for any number of objects and valid for objects that contact with each other by employing the contact-region modeling (CRM) technique. Moreover, a novel combined field integral equation (CFIE)-based TCM has been proposed in this letter to deal with the internal resonance and decrease the condition numbers.
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Ren et al. (2024) studied this question.
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