Li. Basilio et al., The dependence of the input impedance on feed position of probe and microstrip line-fed patch antennas, IEEE ANTENN, 49(1), 2001, pp. 45-47
The impedance of a rectangular patch antenna fed by an inset microstrip tra
nsmission line was measured for various feed positions. The dependence foun
d was then compared to theoretical predictions both for this geometry and f
or the similar case of an inset coaxial probe feed.