Patent ID: 8704719

Claim:
An antenna comprising: a coplanar wave guide (CPW) transmission line; and a radiating portion coupled to the CPW transmission line, the radiating portion configured to produce a linear polarization at a first frequency and a circular polarization at a second frequency; wherein: the radiating portion comprises a conductive material extending from the CPW transmission line and forming a plurality of openings in the radiating portion, the plurality of openings being asymmetric with respect to a first region of the radiating portion that is disposed on a first side of the CPW transmission line and a second region of the radiating portion that is disposed on a second side of the CPW transmission line; and the conductive material defines: a first strip of the radiating portion in contact with and perpendicular to the CPW transmission line; a second strip of the radiating portion in contact with and perpendicular to the first strip; a third strip of the radiating portion in contact with the first strip and parallel to the second strip; a fourth strip of the radiating portion in contact with the second strip and the third strip and parallel to the first strip; and a first rectangular conductive region connected to the first strip and the second strip in the first region, but not in the second region.