Title :
Theory and experiment of a coaxial probe fed hemispherical dielectric resonator antenna
Author :
Leung, K.W. ; Luk, K.M. ; Lai, K.Y.A. ; Lin, D.
Author_Institution :
Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, Hong Kong
fDate :
10/1/1993 12:00:00 AM
Abstract :
A hemispherical dielectric resonator antenna fed by a coaxial probe is studied both theoretically and experimentally. The Green´s function for the evaluation of the input impedance is derived rigorously and expressed in a form convenient for numerical computations. The method of moments is used to obtain the probe current from which the input impedance of the DR antenna is calculated. Both delta gap and magnetic frill source models are considered. Moreover, the results using a reduced kernel as well as the exact kernel are presented. Both entire basis (EB) and piecewise sinusoidal (PWS) expansion modes are used and the results are compared. The effects of the probe length, feed position, and dielectric constant on the input impedance are discussed. Finally, the theoretical radiation patterns for the first three resonant modes (TE111, TM101, and TE221) of the DR antenna are presented
Keywords :
Green´s function methods; antenna feeders; antenna radiation patterns; dielectric resonators; electric current; electric impedance; permittivity; probes; Green´s function; coaxial probe feeder; delta gap source models; dielectric constant; entire basis expansion modes; feed position; hemispherical dielectric resonator antenna; input impedance; magnetic frill source models; method of moments; piecewise sinusoidal expansion modes; probe current; probe length; radiation patterns; resonant modes; Antenna theory; Coaxial components; Dielectric resonator antennas; Feeds; Green´s function methods; Impedance; Kernel; Moment methods; Probes; Tellurium;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
