Dual band antenna pair with high isolation

摘要

A dual band printed antenna pair operates simultaneously at both WLAN frequency bands (2.4 GHz/5 GHz). The antenna pair provides high isolation between both antennas while having an efficient over the air performance. The antenna pair achieve greater than 20 dB isolation at 2.4 GHz and 5 GHz band, while having antennas positioned in close proximity. The high isolation is accomplished using an orthogonal antenna configuration (exploiting orthogonal polarization) and a parasitic element to further enhance isolation at 2.4 GHz. The antenna pair and parasitic element are printed on a Printed Circuit Board (PCB) adding relatively little cost to the Radio Frequency (RF) interface. The PCB is then fixed on top of a metal chassis with the antenna keep out area overhanging a corner of the metal chassis to enhance performance.

主权项

1. An apparatus comprising:
a ground plane on a first side of a substrate; a first planar metallic antenna on a second side of the substrate; a second planar metallic antenna on the second side of the substrate, wherein the first planar metallic antenna and the second planar metallic antenna are configured to have orthogonal polarization; and a planar metallic parasitic element disposed between the first and second planar metallic antennas on the second side of the substrate and configured to provide electrical isolation between the first and second planar metallic antennas, wherein the planar metallic parasitic element is in the same plane as the first planar metallic antenna and the second planar metallic antenna, said same plane being parallel to the ground plane, the planar metallic parasitic element is electrically connected to the ground plane.