MIMO Antenna Ground Loop Layout for Stable SWR in Narrow Bands
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Solution Overview
Problem
Existing MIMO antennas with narrow structures face challenges in maintaining good standing wave ratio characteristics while achieving wideband performance, particularly in low-frequency bands.
Innovation Solution
A MIMO antenna design that includes a substrate with first and second feed lines, radiators, ground patterns, and connection lines forming an electrical loop, which improves current flow and stabilizes radiation patterns and standing wave ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If narrow antenna structures are used, then the antenna size is reduced, but the standing wave ratio characteristics are degraded
Solution Approach 1:
The patent introduces connection lines that extend in the longitudinal direction to connect ground patterns, effectively adding a dimensional element to the antenna structure. This longitudinal extension improves current flow paths without increasing the transverse footprint, thereby maintaining compact size while improving standing wave ratio characteristics through enhanced three-dimensional current distribution.
Solution Approach 2:
The antenna structure is divided into multiple ground patterns (first ground pattern, second ground pattern) connected by connection lines. This segmentation allows each ground pattern to be optimized independently while the connection lines provide additional current paths, resolving the contradiction between compact size and standing wave ratio by creating multiple current flow channels within the narrow structure.
2Volume of moving object
If narrow antenna structures are used, then the antenna size is reduced, but the radiation performance in low frequency band is degraded
Solution Approach 1:
The connection lines extending in the longitudinal direction create additional current paths that enhance radiation efficiency in the low frequency band. By utilizing the longitudinal dimension rather than increasing transverse size, the antenna achieves improved low-frequency radiation performance while maintaining a compact narrow structure.
Solution Approach 2:
The connection lines act as intermediary elements that facilitate current flow between ground patterns, improving current distribution and radiation performance in the low frequency band without requiring a larger antenna structure. These intermediaries enable effective current paths in a compact configuration.
3Adaptability or versatility
If wideband characteristics are achieved, then the frequency range is expanded, but the standing wave ratio characteristics are degraded
Solution Approach 1:
Multiple ground patterns connected by connection lines create segmented current paths that improve standing wave ratio across wide frequency ranges. Each ground pattern and connection line combination provides specific current flow characteristics that collectively enhance wideband performance while maintaining good standing wave ratio characteristics.
Solution Approach 2:
The connection lines serve multiple functions: they connect ground patterns, provide additional current paths for wideband operation, and improve standing wave ratio characteristics simultaneously. This multi-functionality allows the antenna to achieve wideband characteristics without sacrificing standing wave ratio performance.
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
The design achieves stable radiation patterns and improved standing wave ratio characteristics, enabling wideband performance even in narrow-sized antennas, thereby enhancing radiation efficiency.
Implementation Method 1
a first connection line connecting the first ground pattern and the second ground pattern... a second connection line connecting the first ground pattern and the second ground pattern... An electrical loop is formed by the first connection line and the second connection line
Data Source
AI summary
A MIMO antenna comprises: a substrate; a first feed line and a second feed line formed on the front side of the substrate and spaced apart from each other; a first radiator receiving a feed signal from the first feed line; a second radiator spaced apart from the first radiator by a predetermined distance and receiving a feed signal from the second feed line; a first ground pattern surrounding the first feed line, electrically connected to the ground, and extending in the longitudinal direction of the substrate; a second ground pattern spaced apart from the first ground pattern by a predetermined distance, surrounding the second feed line, electrically connected to the ground, and extending in the longitudinal direction of the substrate; a first connection line connecting the first ground pattern and the second ground pattern in an area adjacent to the first longitudinal ends of the first ground pattern and the second ground pattern.