Title :
Influence of residual air gaps on characteristics of circularly polarised aperture-coupled millimetre-wave microstrip antennas
Author :
Sauleau, R. ; Coquet, Ph
Author_Institution :
Inst. d´´Electronique et de Telecommun. de Rennes, Univ. de Rennes I, France
fDate :
6/12/2003 12:00:00 AM
Abstract :
The influence of residual air gaps located between the two substrates of aperture-coupled printed antennas is investigated theoretically and experimentally in the 60 GHz band. It is shown that the input impedance and the axial ratio of thin-film circular polarisation patches and arrays are strongly altered by small gaps a few micrometres thick. An alternative configuration, comprising two ground planes and compatible with photolithographic processes, is then proposed to overcome this drawback.
Keywords :
electromagnetic wave polarisation; microstrip antenna arrays; millimetre wave antenna arrays; EHF; MM-wave antennas; aperture-coupled microstrip antennas; arrays; axial ratio; circularly polarised microstrip antennas; ground planes; input impedance; millimetre-wave microstrip antennas; printed antennas; residual air gaps; thin-film circular polarisation patches;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20030591
