Multi-band Antenna Array With Segmented Ground Plane
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Solution Overview
Problem
Designing a compact multi-band multi-antenna array for handheld communication devices that achieves high data throughput and radiation efficiency across different frequency bands while minimizing energy coupling and size constraints is challenging due to increased envelop correlation coefficients and design complexity.
Innovation Solution
A dual antenna array design with a ground conductor plane and resonant loops that generate distinct resonant modes for different frequency bands, using capacitive and inductive coupling to stagger the resonant loops and reduce energy coupling, allowing for compact integration without overlapping, thus achieving multi-band operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple antennas are integrated in a space-limited handheld device, then antenna integration density increases, but envelop correlation coefficients increase resulting in reduced radiation efficiency
Solution Approach 1:
The patent divides the single ground plane into multiple segmented ground planes with different ground lengths for different antenna elements. Each antenna is associated with a specific ground plane segment, which isolates the antennas from each other and reduces mutual coupling. This segmentation allows multiple antennas to coexist in a compact space while maintaining low correlation coefficients and good radiation efficiency.
Solution Approach 2:
The patent applies different ground plane configurations to different antenna elements based on their specific requirements. Each antenna has a customized ground plane with specific length and positioning optimized for its operating frequency and radiation pattern. This local optimization ensures that each antenna maintains high radiation efficiency despite the presence of other antennas in close proximity.
2Volume of moving object
If antenna array size is reduced for compact integration, then device size decreases, but design complexity increases due to multi-band decoupling requirements
Solution Approach 1:
The patent designs a universal ground plane structure that serves multiple functions simultaneously: it provides impedance matching, reduces mutual coupling, supports multiple frequency bands, and simplifies the overall antenna array design. The segmented ground plane configuration is applied uniformly across all antenna elements, making the design process more systematic and less complex despite the multi-band requirements.
Solution Approach 2:
The patent optimizes specific parameters of the ground planes (such as ground length, width, and positioning) to achieve decoupling between antennas across multiple frequency bands. By carefully adjusting these parameters, the design achieves low correlation coefficients without requiring complex decoupling structures, thereby reducing overall design complexity while maintaining compact size.
3Loss of energy
If protruding or notched structures are added to ground planes for energy isolation, then energy isolation between antennas increases, but additional coupling current is excited increasing correlation coefficient
Solution Approach 1:
The patent converts the potential harmful effect of ground plane discontinuities into a beneficial decoupling mechanism. Instead of adding protruding or notched structures that excite coupling currents, the patent uses smooth segmented ground plane boundaries that naturally reduce mutual coupling without creating additional current paths. The ground plane segments are positioned and dimensioned to create electromagnetic isolation between antennas while avoiding the excitation of parasitic coupling currents.
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 solution effectively reduces the size of the antenna array while maintaining high radiation efficiency and isolation between antennas, enabling efficient data transmission across multiple frequency bands with reduced energy coupling and correlation coefficients.
Implementation Method 1
The first resonant loop is configured to excite the first antenna generating a first resonant mode, and the first radiating conductor line is configured to excite the first antenna generating a second resonant mode. The frequencies of the first resonant mode are lower than those of the second resonant mode.
Implementation Method 2
The first resonant loop is formed by connecting a first signal source, a first feeding conductor line, a first capacitive coupling portion, a first resonant conductor line, a first inductive grounding conductor portion, and the first edge in series.
Implementation Method 3
The first resonant loop is formed by connecting a first signal source, a first feeding conductor line, a first capacitive coupling portion, a first resonant conductor line, a first inductive grounding conductor portion, and the first edge in series.
Data Source
AI summary
A multi-band multi-antenna array includes a ground conductor plane and a dual antenna array. The ground conductor plane includes a first edge and separates a first side space and a second side space. The dual antenna array has a maximum array length extending along the first edge and includes a first antenna and a second antenna. The first antenna includes a first resonant loop and a first radiating conductor line exciting the first antenna generating a first resonant mode and a second resonant mode, respectively, wherein frequencies of the first resonant mode are lower than frequencies of the second resonant mode. The second antenna includes a second resonant loop and a second radiating conductor line exciting the first antenna generating a third resonant mode and a fourth resonant mode, respectively, wherein frequencies of the third resonant mode are lower than frequencies of the fourth resonant mode.