Corner-Mounted Antenna Layout for MIMO Isolation and Roundness
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Solution Overview
Problem
Existing omnidirectional antennas in mobile communications devices face challenges in miniaturization, achieving broadbandization, maintaining antenna isolation, and ensuring power balance, which affects MIMO performance due to asymmetry and sensitivity to carrier shape changes, leading to poor roundness and pattern distortion.
Innovation Solution
The antenna element is positioned at a specific corner on a metal carrier with a feedpoint designed to enhance roundness and signal coverage, utilizing a radiation structure with active and passive patches connected by capacitance or inductance, and a dielectric or plastic support to improve radiation symmetry and isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antenna elements are miniaturized to reduce device size, then device compactness is improved, but isolation between antennas deteriorates
Solution Approach 1:
The patent positions antenna elements at corner positions of the PCB board rather than distributing them across the central area. This spatial reconfiguration in three-dimensional space increases the effective distance between antenna elements, thereby improving isolation while maintaining the miniaturized form factor of the device.
Solution Approach 2:
The patent employs asymmetric placement of antenna elements at specific corner positions of the PCB board, breaking the traditional symmetric distribution pattern. This asymmetric configuration optimizes the electromagnetic field distribution and reduces mutual coupling between antennas, achieving better isolation in a compact design.
2Shape
If symmetrical structure is used for omnidirectional antenna, then pattern symmetry is improved, but bandwidth is limited
Solution Approach 1:
The patent intentionally introduces asymmetric structures into the omnidirectional antenna design, such as non-uniform ground plane configurations or asymmetric feeding networks. These asymmetric elements broaden the impedance bandwidth while the overall corner position placement maintains sufficient pattern symmetry for omnidirectional performance.
Solution Approach 2:
The patent modifies structural parameters of the antenna elements and ground plane to achieve broadband performance. By adjusting dimensions, shapes, and positions of antenna elements and ground plane features, the antenna achieves wide bandwidth coverage while maintaining acceptable pattern symmetry.
3Adaptability or versatility
If antenna is integrated on thick module, then module functionality is improved, but pattern roundness deteriorates
Solution Approach 1:
The patent optimizes the local electromagnetic environment around the antenna elements by designing specific ground plane structures and shielding configurations at the corner positions. This local optimization compensates for the detrimental effects of module thickness, maintaining pattern roundness despite the three-dimensional integration environment.
Data Source
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AI summary
The present invention relates to the field of communications technologies and discloses a communications device. The communications device includes a metal carrier having a mounting plane, where at least one mounting area is defined on the mounting plane, and further includes an antenna element disposed in each mounting area. The mounting area is an area in which the mounting plane intersects a circle centered at a feedpoint of the antenna element in the area and whose radius does not exceed a specified radius. When a boundary line of the mounting area includes a boundary line of the mounting plane, a distance from the feedpoint in the mounting area to the boundary line of the mounting area is less than or equal to a specified distance; and/or when a boundary line of the mounting area includes a vertex of the mounting plane, a distance from the feedpoint in the mounting area to the vertex is less than or equal to a specified distance. The metal carrier is considered as a part of an antenna body for joint design. The antenna element is arranged in a corner position on the metal carrier. A feed position on the antenna element is designed to obtain relatively good antenna roundness performance and enhance an antenna signal coverage effect.