A Novel Method to Interpret the Mutual Coupling Based on Characteristic Mode Theory

摘要

This paper presents a novel method to evaluate the mutual coupling based on the theory of characteristic mode (TCM). The radiation energy and mutual coupling of each port in an antenna system is decomposed. The modal contribution on both radiation energy and mutual coupling are unified and represented by the same term, i.e., the modal energy occupied coefficients (MEOC). In addition to this, the linear transformation of feeding network in the multi-port antenna system has been adopted to complete the modal based method. A four-port rectangular antenna and a twin dipole system are used as examples to verify the method.