Work-Energy Principle Based Characteristic Mode Theory With Solution Domain Compression for Metal-Material Composite Scattering Systems.

This article focuses on further improving the characteristic mode theory (CMT) for metal-material composite scattering objects. The improved CMT is alternatively established in a novel work-energy principle (WEP) framework. Under the WEP framework, a novel driving power operator (DPO) is introduced as the generating operator for characteristic modes (CMs). Then, a novel diagonalizing DPO method is proposed to construct the CMs. In addition, a novel solution domain compression (SDC) scheme is developed to suppress spurious modes. Compared with the conventional integral equation (IE) framework, the novel WEP framework more clearly reveals the core physical feature of CMs, and then easily derives the famous Parseval’s identity. Compared with the conventional impedance matrix operator (IMO), the novel DPO is more advantageous in the aspect of distinguishing independent variables from dependent variables, and has a smaller computational burden, and has a more acceptable numerical performance in the aspect of calculating CMs. Compared with the conventional dependent variable elimination (DVE) scheme, the novel SDC scheme is equally effective in the aspect of suppressing spurious mode, and reconfirms the same conclusion that the spurious modes result from ignoring the dependence relationships among the currents contained in DPO. [ABSTRACT FROM AUTHOR]