Edge feeding of circular patch microstrip antennas

Edge feeding of a circular patch antenna by a microstrip line has been achi eved by utilizing the circumferential variation of the field which is fixed by loading the patch. However, loading splits the degenerate modes and giv es rise to cross-polarization. Three different techniques are presented to analyze the loaded circular patch antenna. Comparison with the measured res ults for input impedance and radiation patterns shows good agreement. The c oncept used here is very general and can be applied to the edge feeding of any ring antenna. (C) 2001 John Wiley & Sons. Inc.