Synthesis Method for Obtaining Characteristic Modes of Multistructure Systems via Independent Structure T-Matrix

This article presents a novel and efficient method for characteristic mode decomposition in multistructure systems. By leveraging the translation and rotation matrices of vector spherical wavefunctions, our approach enables the synthesis of a composite system’s characteristic modes using independently computed simulations of its constituent structures. The computationally intensive translation process is simplified by decomposing it into three streamlined subtasks: rotation, z-axis translation, and inverse rotation, collectively achieving significant improvements in computational efficiency. Furthermore, this method facilitates the exploration of structural orientation effects without incurring additional computational overhead. A series of illustrative numerical examples are provided to validate the accuracy of the proposed method and underscore its substantial advantages in both computational efficiency and practical applicability.