Patent ID: 8049676

Claim:
A planer antenna structure comprises: a first planer helical antenna having a first axial orientation, wherein the first planer helical antenna has a conductive antenna pattern on a first surface of a supporting substrate; a second planer helical antenna having a second axial orientation, wherein the second planer helical antenna has a conductive antenna pattern on the first surface of the supporting substrate and wherein the second axial orientation is different from the first axial orientation, but in which the first and second axial orientations are planar with each other for operation of the antennas; a ground pattern on a second surface of the supporting substrate to provide a ground connection for the first and second planer helical antennas, wherein the ground pattern includes a first geometric shape of a conductive material approximately centered at an intersection of the first and second axial orientations, in which the first and second planer helical antennas are off-center of the intersection of the first and second axial orientations; and a conductive radial wall electrically coupled to the ground pattern and extending at least a length of the conductive antenna patterns along an axis that is between the first and second axial orientations to provide electrical isolation between the first planar helical antenna and the second planer helical antenna.