Patent ID: 7952525

Claim:
An antenna device comprising: a substrate of insulation formed in a substantially rectangular shape; a ground pattern formed on a lower surface of the substrate; a conductive flat antenna main body, formed on an upper surface of the substrate having an octagonal shape and including an RF feeding point, the conductive flat antenna main body being configured to radiate an RF signal and being positioned on the substrate; a plurality of triangular semiconductive polarization control elements each positioned on diagonal transverse lines across the flat antenna main body over an insulation region of the substrate, each diagonal transverse line bisecting opposite corners of the substrate, the transverse lines intersecting in a center of the conductive flat antenna main body; and a plurality of control electrodes, each arranged on one of the triangular semiconductive polarization control elements to apply a biasing voltage thereto; and a plurality of control terminals each connected to one of the plurality of control electrodes, each of the control terminals receiving the biasing voltage to control conductivity of a respective triangular semiconductive polarization control element, wherein a subset of said plurality of triangular semiconductive polarization control elements are in a conductive state when a forward biasing voltage is applied by corresponding control electrodes to move anions from the substrate to the subset of the plurality of triangular semiconductive polarization control elements, and the subset of the plurality of triangular semiconductive polarization control elements are in a non-conductive state when a reverse biasing voltage is applied via the corresponding control electrodes to move anions from the substrate to the ground pattern, a state of the plurality of triangular semiconductive polarization control elements determining a polarization of the antenna device.