Stacked annular ring dielectric resonator antenna excited by axi-symmetric coaxial probe

Author

Shum, S.M. ; Luk, K.M.

Author_Institution

Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, Hong Kong

Volume

43

Issue

8

fYear

1995

fDate

8/1/1995 12:00:00 AM

Firstpage

889

Lastpage

892

Abstract

A stacked annular ring dielectric resonator (DR) antenna composed of commercially available dielectric resonators and exited by axi-symmetric coaxial probe is studied computationally using the finite-difference time-domain (FDTD) method. The numerical results are checked against experimental measurements, and good agreement is observed. It is demonstrated that the introduction of air-gaps between the two DR´s and also between the driven DR and the ground plane can improve the impedance bandwidth of the antenna significantly. The effects of the air-gaps thickness on the return loss and the bandwidth are discussed. The far-fields are also calculated by applying the electromagnetic field equivalence principle. The antenna produces an end-fire radiation field similar to that of an electric monopole

Keywords

air gaps; antenna radiation patterns; dielectric resonators; electric impedance; finite difference time-domain analysis; linear antenna arrays; loop antennas; air-gaps; axi-symmetric coaxial probe; electric monopole; electromagnetic field equivalence principle; end-fire radiation field; far-fields; finite-difference time-domain method; ground plane; impedance bandwidth; return loss; stacked annular ring dielectric resonator antenna; Air gaps; Antenna measurements; Bandwidth; Coaxial components; Dielectric measurements; Dielectric resonator antennas; Finite difference methods; Impedance; Probes; Time domain analysis;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.402212

Filename

402212