Patent ID: 8970444
Filing Date: 2015-03-03
Classification: H01Q

Abstract:
1. A dual polarized antenna structure, in a wireless communications system, with a first radiation pattern having a first polarization and a second radiation pattern having a second polarization, the antenna structure comprising: a plurality of main radiating antenna elements, each main radiating antenna element having a longitudinal extension in an extension plane, the main radiating antenna elements being arranged along the longitudinal extension and above a conductive frame serving as a ground plane, and a perpendicular projection of each of the main radiating antenna elements onto a surface of the conductive frame falling within an area of the frame surface; and a combination of conductive parasitic strips and chokes, realized with a notch spanning substantially an entire length of each of opposite longitudinal sides of the conductive frame, the conductive parasitic strips and notches being arranged in association with the main radiating antenna elements to control beam widths of the first radiation pattern and second radiation pattern in a plane perpendicular to the longitudinal extension of the main radiating antenna elements, wherein the conductive strips are arranged beside the plurality of main radiating antenna elements along the direction of the longitudinal extension, wherein the first and second polarizations are linear polarizations that are orthogonal to each other, and wherein an arrangement of the notches and an arrangement of the conductive parasitic strips, respectively and substantially independently, affect beam widths of the first radiation pattern and beam widths of the second radiation pattern.