Experimental study of the cross polarization characteristics of rectangular patch antennas

Experimental results are presented on the cross-polarization characteristics of rectangular patch antennas. The rectangular patch was fabricated on cuflon substrate with relative permittivity epsilon r=2.1 and thickness t=10 mil (0.0254 cm) and 30 mil (0.0762 cm). It is found that the dependence of mod E/sub c//E/sub x/ mod /sup 2//sub max/ on the aspect ratio is different for E and H planes. A best value can be found to yield the largest mod E/sub c//E/sub x/ mod /sup 2//sub max/ for both planes, but this value depends on the thickness of the substrate. In addition, it has been found that mod E/sub c//E/sub x/ mod /sup 2//sub max/ decreases as the resonant frequency increases.<>