Wideband, high isolation two port antenna array for multiple input, multiple output handheld devices

摘要

A multiple input-multiple output antenna assembly with high isolation between the antennas is disclosed. The antenna assembly includes a substrate with a ground layer at its surface. Two antennas are disposed opposing each other on the substrate. An isolation element in a form of a patterned slot is interposed between the first and second antennas on the ground plane. A first signal port is provided for applying a first signal to excite the first antenna and a second signal port is provided for applying a second signal to excite the second antenna. The isolation element provides isolation that inhibits electromagnetic propagation between the two antennas.

主权项

1. An antenna assembly for a wireless communication device comprising:
a ground plane formed by a layer of electrically conductive material on a substrate of non-conductive material, the layer of electrically conductive material having a thickness; a first radiating element formed by a first radiation slot disposed in the ground plane conductive material; a second radiating element formed by a second radiation slot disposed in the ground plane conductive material and spaced apart from the first radiating element by at least one-tenth of a wavelength of a resonant frequency of the second radiating element, the first and second radiating elements configured for operation over a bandwidth;
a first signal port provided by contacts on the ground plane conductive material on opposing sides of the first radiation slot;a second signal port provided by other contacts on the ground plane conductive material on opposing sides of the second radiation slot, wherein mutual coupling occurs between the first radiating element and the second radiating element; an isolating element formed in the ground plane conductive material interposed between the first radiating element and the second radiating element; the isolating element comprising:
a meandering slot extending through the thickness of the ground plane to the underlying substrate, including an electrical length of a quarter wavelength of an operating frequency of the antenna, wherein the meandering slot has a first leg that extends orthogonally inward from an edge of the ground plane common to the first and second radiating elements, the first leg terminating at an inner end, and the meandering slot further comprises a second leg extending from the inner end parallel to the common edge and toward the first radiating element terminating at a first remote end, a third leg projecting from the first remote end and orthogonally away from the common edge until terminating at a second remote end, and a fourth leg extending from the second remote end parallel to the common edge and toward the second radiating element wherein a width and length of at least one leg is different to the others, to reduce said mutual coupling between the first radiating element and the second radiating element over the operating bandwidth of the slot antennas.