Title :
Microstrip antennas covered with dielectric materials
Author :
Luk, K.M. ; Tam, W.Y.
Author_Institution :
Dept. of Electron., Chinese Univ. of Hong Kong, Shatin, Hong Kong
Abstract :
A dielectric cover is usually added on top of a microstrip antenna to protect the antenna from environmental damage. The effects of a dielectric cover on the characteristics of circular and annular ring patch antennas are investigated. The theoretical results are derived from the conventional Hankel transform analysis. Some experimental data are also obtained to verify the theory. In general, it is found that when the thickness of the cover is increased, the resonant frequency decreases monotonically. It is also observed that the half-power bandwidth only changes slightly with the superstrate thickness.<>
Keywords :
dielectric-loaded antennas; loop antennas; microstrip antennas; annular ring patch antennas; circular patch antennas; conventional Hankel transform analysis; dielectric cover; environmental damage; half-power bandwidth; microstrip antennas; resonant frequency; superstrate thickness; Bandwidth; Dielectric constant; Dielectric materials; Distributed parameter circuits; Geometry; Microstrip antennas; Patch antennas; Protection; Resonant frequency; Shape;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1989. AP-S. Digest
Conference_Location :
San Jose, CA, USA
DOI :
10.1109/APS.1989.134762
