Title :
Surface wave efficiency of microstrip antennas
Author :
Herscovici, N. ; Aberle, J.T.
Author_Institution :
D&M Chu Technology, Littleton, MA, USA
fDate :
June 28 1993-July 2 1993
Abstract :
A theoretical comparison between the surface wave (SW) efficiency of probe-fed and aperture-coupled rectangular patch antennas is presented. In both cases the analysis is based on a full-wave formulation. The SW efficiencies of the two patches were found to be almost the same. The SW efficiency is a function of the substrate thickness and dielectric constant as well as the current distribution of the antenna. Since the current distributions for both geometries are very similar, the SW efficiencies are almost identical. As long as the resonant frequency of the slot is above that of the patch (to avoid losses due the slot radiation), it should be safe to assume that the overall efficiencies of the two geometries are very similar. The efficiency of the aperture-coupled patch is only slightly smaller due to SW excitation by the microstrip feed line.<>
Keywords :
Galerkin method; Green´s function methods; antenna feeds; aperture antennas; current distribution; microstrip antennas; permittivity; substrates; surface electromagnetic waves; aperture-coupled patch; current distributions; dielectric constant; microstrip antennas; microstrip feed line; probe-fed patch; rectangular patch antennas; resonant frequency; slot radiation; substrate thickness; surface wave efficiency; Aperture antennas; Aperture coupled antennas; Bandwidth; Dielectric materials; Geometry; Microstrip antennas; Permittivity; Probes; Surface impedance; Surface waves;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1993. AP-S. Digest
Conference_Location :
Ann Arbor, MI, USA
Print_ISBN :
0-7803-1246-5
DOI :
10.1109/APS.1993.385265
