J. Phys. III France
Volume 7, Numéro 3, March 1997
Page(s) 619 - 630
DOI: 10.1051/jp3:1997146
J. Phys. III France 7 (1997) 619-630

Green Dyadics in Composite Chiral-Ferrite Medium by Cylindrical Vector Wave Functions

Dajun Cheng1 and Wei Ren2

1  Wave Scattering and Remote Sensing Center, Department of Electronic Engineering, Fudan University, Shangai 200433, People's Republic of China
2  Department of Computer Science and Communication Engineering, Kyushu University 36, Fukuoka 812, Japan

(Received 24 October 1996, accepted 5 December 1996)

Composite chiral-ferrite medium, which is a generalization of the well-studied chiral medium, has potential application in chirality management. In the present investigation, based on the concept of spectrl eigenwaves, eigenfunction expansion of the Green dyadics in an unbounded composite chiral-ferrite medium is developed in the forms of the cylindrical vector wave functions. The formulations are considerably simplified by analytically evaluating the integrals with respect to the spectral longitudinal and radial wevenumbers, respectively. The analysis indicates that the solutions of the source-incorporated Maxwell's equations for a homogeneous composite chiral-ferrite medium, which can be represented in sum-integral forms of the cylindrical vector wave functions, are composed of two (or four) eigenwaves travelling with different wavenumbers. Each of these eigenwaves is a superposition of two transverse waves and a longitudinal wave. The Green dyadics of planarly and cylindrically multilayered structures consisting of composite chiral-ferrite media can be straightforwardly obtained by applying the method of scattering superposition and appropriate boundary conditions, respectively. The present formulations, which can be theoretically verified by comparing their special forms with the already existed results, provide fundamental basis to analyze the physical phenomena of the composite chiral-ferrite media.

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