High Efficiency Excitation of Dielectric Rods Using a Magnetic Ring Current

Author

Hanham, Stephen M. ; Bird, Trevor S.

Author_Institution

Dept. of Electr. & Inf. Eng., Univ. of Sydney, Sydney, NSW

Volume

56

Issue

6

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

1805

Lastpage

1808

Abstract

We describe a theoretical analysis of the excitation of the fundamental surface wave mode on an infinite dielectric rod by a magnetic ring current that is interior to the rod. Earlier work has provided results for an external ring source. Results obtained by us show that for an interior source excitation efficiencies close to 100% are possible for high permittivity dielectrics and launching efficiencies greater than 90% can be achieved over bandwidths greater than 20%. This is a higher efficiency than is possible with an exterior source. Simulation results verifying the theoretical analysis are presented for the practical case of a coaxial waveguide exciting the dielectric rod.

Keywords

antennas; coaxial waveguides; dielectric materials; permittivity; coaxial waveguide; dielectric rod antenna; magnetic ring current; permittivity dielectrics; Birds; Dielectric losses; Dipole antennas; Frequency; Integral equations; Magnetic analysis; Magnetic materials; Maxwell equations; Permittivity; Surface waves; Dielectric rod; excitation efficiency; magnetic ring current;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2008.923335

Filename

4538146