MIMO Antenna Array With Coupled Radiating Elements For Compact Mobile Terminals
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Solution Overview
Problem
Current MIMO antenna designs for metallic mobile terminals require significant space due to high spacing between antenna units, which is a challenge for compact device development, especially with the trend towards higher screen-to-body ratios and wider frequency bands.
Innovation Solution
The design includes a plurality of antenna units arranged in an array, where feeders are connected to either the first or second radiating elements, with specific slot and stub configurations to enhance isolation and reduce space occupancy, utilizing bent radiating elements and slots, and insulation layers to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling antenna is added to form a MIMO antenna unit, then antenna bandwidth is increased and isolation between MIMO units is improved, but space occupied by the antenna and spacing between MIMO antenna units increases
Solution Approach 1:
The patent combines the coupling antenna function with the radiating element itself. The first radiating element serves dual purposes: as the primary radiating structure and as the coupling antenna for adjacent units. This integration eliminates the need for separate coupling antennas, reducing overall space occupation while maintaining isolation performance between MIMO units
Solution Approach 2:
The first radiating element performs multiple functions simultaneously: it radiates electromagnetic signals as a conventional antenna element and also acts as a coupling antenna for adjacent antenna units. This multi-functionality reduces the total number of components needed and minimizes the space required for the antenna system
2Shape
If high screen-to-body ratio is achieved using full-display technique, then device compactness is improved, but space for communication antenna is reduced
Solution Approach 1:
The patent transitions antenna layout from a planar two-dimensional arrangement to a three-dimensional stacked configuration. Multiple radiating elements are arranged in different layers along the thickness direction, allowing antennas to coexist in limited space without interfering with the full-display design, thus enabling high screen-to-body ratio while accommodating necessary antenna space
3Reliability
If multiple MIMO antenna units are disposed in parallel, then MIMO system performance is improved, but entire system occupies comparatively large space
Solution Approach 1:
The patent arranges multiple MIMO antenna units in a stacked three-dimensional configuration rather than parallel two-dimensional placement. By utilizing the thickness direction for spatial separation, the system achieves the required isolation between antenna units for MIMO performance while minimizing the planar footprint and overall volume occupied by the antenna system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration increases isolation between adjacent antenna units, reduces the overall space occupied by the antenna, and improves bandwidth and performance by allowing for a more compact and efficient antenna arrangement.
Implementation Method 1
the first radiating element is coupled to the at least one radiating stub... the second radiating element includes at least one radiating stub... the first slot is coupled to the at least one radiating stub
Data Source
AI summary
An antenna and a mobile terminal are provided. The antenna includes a plurality of antenna units arranged in an array, and each antenna unit includes a first radiating element and a second radiating element, where the first radiating element includes a first slot disposed on a metal layer, the second radiating element includes at least one radiating stub, and the first radiating element is coupled to the at least one radiating stub. In any two adjacent antenna units, a feeder of one antenna unit is connected to a first radiating element of the antenna unit, and a feeder of the other antenna unit is connected to a second radiating element of the antenna unit. In the technical solution, feeders of adjacent antenna units are directly connected to different first radiating elements and second radiating elements.