L-Shaped Parasitic Elements for MIMO Antenna ECC Reduction
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Solution Overview
Problem
MIMO antenna designs in mobile devices often result in high Envelope Correlation Coefficient (ECC) due to similar radiation patterns and close proximity of antenna elements, degrading communication quality.
Innovation Solution
Incorporating L-shaped metal elements adjacent to the feeding points of monopole antennas on a dielectric substrate, which resonate at the operation frequency to alter radiation patterns and reduce ECC between antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO antenna design is used to improve wireless communication coverage and data rate, then communication performance is improved, but the Envelope Correlation Coefficient (ECC) between antenna elements increases due to similar radiation patterns and close proximity
Solution Approach 1:
A parasitic element is introduced as an intermediary component between the first and second antenna elements. This parasitic element acts as a mediator to decouple the electromagnetic fields between the two antennas, thereby reducing the ECC while maintaining the MIMO communication performance. The parasitic element is positioned adjacent to one of the antenna elements and interacts with both antennas to achieve field decoupling.
Solution Approach 2:
The radiation patterns of the antenna elements are modified by changing the electromagnetic environment through the introduction of the parasitic element. This changes the current distribution and radiation characteristics of the antenna elements, making their radiation patterns more different from each other, which directly reduces the ECC between them while maintaining communication performance.
2Volume of moving object
If antenna elements are disposed close to each other to reduce device size, then device compactness is improved, but ECC between antenna elements increases
Solution Approach 1:
The parasitic element serves as a space-efficient intermediary that fits within the compact device structure. By placing this element adjacent to one antenna element, it creates electromagnetic decoupling without requiring additional space, thus maintaining device compactness while reducing ECC between closely-spaced antennas.
3Device complexity
If antenna elements have similar radiation patterns to simplify design, then design complexity is reduced, but ECC between antenna elements increases
Solution Approach 1:
Rather than designing completely different antenna structures, a simple parasitic element is added as an intermediary to one of the existing antenna elements. This approach maintains design simplicity while effectively modifying the radiation patterns through the parasitic element's interaction with both antennas, thereby reducing ECC without significantly increasing design complexity.
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
Significantly decreases ECC from 0.9 to 0.5, enhancing communication diversity and meeting MIMO antenna technology requirements while maintaining wideband coverage and simplicity.
Implementation Method 1
The first metal element and the second metal element are configured to change radiation patterns of the first antenna and the second antenna, thereby reducing an ECC (Envelope Correlation Coefficient) between the first antenna and the second antenna
Data Source
AI summary
A mobile device includes a ground plane, a first antenna, a second antenna, a first metal element, and a second metal element. The first antenna has a first feeding point coupled to a first signal source. The second antenna has a second feeding point coupled to a second signal source. The first metal element has a connection end and an open end. The connection end of the first metal element is coupled to the ground plane, and is adjacent to the first feeding point. The second metal element has a connection end and an open end. The connection end of the second metal element is coupled to the ground plane, and is adjacent to the second feeding point.