复电容率周期介质中空间谐波的相互作用

t ultra-high and ultra-low frequency periodic medium is mostly periodic medium with complex permittivity (PMCP). Based on Maxwell equations and Floquet theorem, governing equation for electromagnetic wave in PMCP has been derived; then the impacts of space harmonic interaction on dispersion curve and space-harmonic amplitude ratio of such medium can be analyzed and calculated. The results show that the properties of PMCP are rather different from those of ordinary periodic medium with real permittivity: it has no obvious band-gap, high-order space harmonic amplitude varies smoothly, with possible maximum less than that of 0-order space harmonic. The results obtained are fundamental for analyzing the structure with PMCP.