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Electromagnetic (EM) scattering systems widely exist in EM engineeringdomain. For a certain objective scattering system, all of its working modesconstitute a linear space, i.e. modal space. Characteristic mode theory (CMT)can effectively construct a basis of the space, i.e. characteristic modes(CMs), and the CMs only depend on the inherent physical properties of theobjective system, such as the topological structure and the material parameterof the objective system. Thus, CMT is very valuable for analyzing and designingthe inherent EM scattering characters of the objective system. This work findsout that integral equation (IE) is not the best framework for carrying CMT.This dissertation proposes a completely new framework for carrying CMT, i.e.work-energy principle (WEP) framework, and at the same time proposes acompletely new method for constructing CMs, i.e. orthogonalizing driving poweroperator (DPO) method. In new WEP framework and based on new orthogonalizingDPO method, this work resolves 5 pairs of important unsolved problems existingin CMT domain.

Research on the Work-Energy Principle Based Characteristic Mode Theory for Scattering Systems