DYADIC GREEN-FUNCTION OF CYLINDRICAL MULTILAYERED CHIRAL MEDIA AND ITS APPLICATIONS

In this paper, a formulation for the dyadic Green's function of cylind rical multilayered chiral media is presented at first using the method s of eigenfunction expansion and scattering superposition. The specifi c expressions of the dyadic Green's function are also found in terms o f normalized cylindrical vector wave functions, when the electric curr ent sources axe placed both inside and outside of a chiral circular cy linder and a cylindrical chirodome. The radiation characteristics of a point dipole antenna on the axis of chiral circular cylinder and cyli ndrical chirodome are analysed. For both cases, the results show that by changing the size of chiral circular cylinder, the thickness of cyl indrical chirodome and the parameters of chiral media, purely circular and linear polarization can be obtained in the far field. Also, the e xpressions of dyadic Green's function given in this paper can be direc tly used to analyse the radiation characteristics of cylindrical chiro strip antennas.