Electromagnetic radiation of antennas in the presence of an arbitrarily shaped dielectric object: Green dyadics and their applications

Citation
Lw. Li et al., Electromagnetic radiation of antennas in the presence of an arbitrarily shaped dielectric object: Green dyadics and their applications, IEEE ANTENN, 49(1), 2001, pp. 84-90
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Information Tecnology & Communication Systems
Journal title
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
ISSN journal
0018-926X → ACNP
Volume
49
Issue
1
Year of publication
2001
Pages
84 - 90
Database
ISI
SICI code
0018-926X(200101)49:1<84:EROAIT>2.0.ZU;2-F
Abstract
Although numerical solutions to the electromagnetic scattering by an arbitr arily shaped object have been obtained using Waterman's T-matrix method (TM M), the general electromagnetic radiation due to an antenna of a three-dime nsional (3-D) current distribution in the presence of an arbitrarily shaped object has not been well considered. In this paper, the technique of surfa ce integral equations has been employed; and as a result, a terse and analy tical representation of the dyadic Green's functions (DGFs) in the presence of an arbitrarily shaped dielectric object is obtained for the antenna rad iation. In a form similar to that associated with the electromagnetic radia tion in the presence of a dielectric sphere, the DGFs inside and outside of the object of arbitrary shape are expanded in terms of spherical vector wa ve functions. However, their coefficients are no longer decoupled due to th e arbitrary surface of a 3-D object. The coupled coefficients are then dete rmined using the surface integral equation approach, in a fashion similar t o that in the T-matrix method. To confirm the applicability and correctness of the approach in this paper, a dielectric sphere, as a special case, is utilized as an illustration. It is found that exactly the same expressions as in the rigorous analysis for the inner and outer spherical regions of th e object are obtained using the different approaches. As applications of th e approach in this paper, radiation problems of an electric dipole in the p resence of superspheroids and rotational parabolic bodies are solved.