Four feed probes are capacitatively coupled to the
conductive patch to provide the antenna excitation. Each feed
probe has a diameter of 1.29 mm and extends completely
through a hole in the substrate of approximate diameter 1.30
mm, with conductive epoxy connecting the probe to the patch
surface and solder connecting the probe to the feed network.
Concentric to the feed probe protrusions, annular ring areas of
the conducting patch are removed with dimensions ri of 3.81
mm and ro of 4.06 mm. The four feed probes are equally
spaced from one another along the diagonals of the square
patch on a radius rf of 28.7 mm