Antenna radiation in the presence of a chiral sphere

Nader Engheta, University of Pennsylvania
Marek W. Kowarz, University of Pennsylvania

Article comments

Reprinted from Journal of Applied Physics, Volume 67, Issue 2, January 1980, pages 639-647.
Publisher URL: http://dx.doi.org/10.1063/1.345766

NOTE: At the time of publication, author Marek W. Kowarz was affiliated with the Institute of Optics, University of Rochester, Rochester, NY 14627

Abstract

The radiation emitted by electromagnetic sources placed both inside and outside of a homogeneous sphere of chiral media is studied using an exact formulation. For both cases, dyadic Green’s functions are found in terms of spherical vector wave functions. The radiated fields and radiation resistance are examined for a dipole located at the center of the chiral sphere. For this case, it is shown that by choosing the sphere’s size and material parameters properly, purely circular polarization can be achieved in the far field. It is also demonstrated that the radiation resistance of the dipole can be increased.