Internal Natural Resonances Prediction Through the Theory of Characteristic Modes

Abstract

Some aspects in the interpretation of the resonances provided by the theory of characteristic modes for dielectric bodies are analyzed. The analysis has been performed analytically based on the Poggio‐Miller‐Chang‐Harrington‐Wu‐Tsai formulation on a canonical problem, the infinite dielectric circular cylinder. First, natural resonances and characteristic mode resonances are presented and compared. It has been observed that characteristic mode resonances are in general near to internal natural resonances but not to external ones. It is also demonstrated that characteristic resonances become closer to internal natural ones as the relative permittivity of the dielectric cylinder is increased.