Patent ID: 9112262
Filing Date: 2015-08-18
Classification: H01L,H01P,H01Q,Y10T

Abstract:
1. An apparatus for wireless communications, the apparatus comprising: a planar patch antenna element disposed on a surface of a substrate, the planar patch antenna having a rectangular shape with a first side having a first length and a second side having a second length different than the first length, the second side being orthogonal to the first side, the planar patch antenna element comprising: an electrically conductive material, the substrate comprising a dielectric material, a receive feed point of the planar patch antenna element tuned to a first frequency corresponding to the first length, and a transmit feed point of the planar patch antenna element tuned to a second frequency corresponding to the second length and different than the first frequency, wherein the planar patch antenna element transmits and receives at different frequencies; a receive feed line disposed on the surface of the substrate, the receive feed line in communication with the planar patch antenna element; a transmit feed line disposed on the surface of the substrate, the transmit feed line in communication with the planar patch antenna element; a closed slot in the electrically conductive material of the planar patch antenna element, the closed slot circumscribing the planar patch antenna element, the receive feed line, and the transmit feed line, the closed slot exposing the dielectric material of the substrate; a ground plane disposed on the surface of the substrate, the ground plane comprising an electrically conductive material, the closed slot disposed between the ground plane and the planar patch antenna element; a quadrature hybrid element that creates circular polarization in the planar patch antenna element; and a capacitive coupling between the planar patch antenna element and at least one of the receive feed line and the transmit feed line, the capacitive coupling providing electrical isolation between the receive feed point and the transmit feed point, wherein the capacitive coupling comprises an elongate conductor disposed parallel to a side of the planar patch antenna element; wherein dimensions of the planar patch antenna element and the closed slot are selected such that the planar antenna element and the closed slot have a radiation efficiency of at least ninety percent.