Multi-Antenna System Resonant Edge Design
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Solution Overview
Problem
Existing multi-antenna systems for lower frequency bands face challenges with large antenna sizes and complex feeding networks, making them impractical for compact communication devices.
Innovation Solution
A communication device with a miniaturized multi-antenna system design that uses resonant portions on adjacent edges of a ground conductor to generate strong surface current distributions, allowing for switchable antenna patterns and reduced overall size through control circuits that adjust electrical coupling states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If lower frequency band is chosen for communication operations, then communication coverage range is improved, but the required overall physical size of antenna elements becomes too large for practical applications
Solution Approach 1:
The antenna system is divided into multiple antenna elements that can be independently controlled. Each antenna element is designed with specific resonant structures (loop resonant structure or open-slot resonant structure) that can be selectively activated. This segmentation allows the system to achieve large coverage range through coordinated operation of multiple smaller elements rather than requiring a single large antenna element.
Solution Approach 2:
The patent implements dynamic control of antenna elements through control circuits that can switch different antenna elements on and off based on communication requirements. The feeding network dynamically adjusts the excitation state of each antenna element, enabling the system to adapt its effective aperture and radiation pattern. This dynamic operation allows compact physical size while maintaining large coverage range through selective element activation.
2Adaptability or versatility
If active antenna array techniques are used, then antenna pattern reconfigurability is improved, but the complexity and cost of feeding networks increases
Solution Approach 1:
The patent combines multiple antenna elements with shared feeding network resources. The feeding network uses common power dividers and phase shifters that can serve multiple antenna elements simultaneously. By merging the feeding paths and control signals, the system achieves antenna pattern reconfigurability without requiring completely separate feeding networks for each element, thereby reducing overall complexity and cost.
Solution Approach 2:
The feeding network is designed with universal components that can serve multiple functions. Power dividers and phase shifters are configured to simultaneously support multiple antenna elements and multiple operating modes. The same feeding network infrastructure enables both single-element operation and multi-element array operation, providing pattern reconfigurability without proportionally increasing complexity.
3Device complexity
If prior pattern reconfigurable multi-antenna techniques are applied, then feeding network complexity is reduced, but the antenna elements still occupy large areas when applied in lower frequency bands
Solution Approach 1:
Each antenna element is designed with specific local resonant structures (loop resonant structure or open-slot resonant structure) that are optimized for compact size. These local resonant structures enable each element to achieve its resonant frequency with minimal physical dimensions. The control circuits selectively activate specific local resonant structures based on the desired radiation pattern, allowing compact element area while maintaining effective lower frequency operation.
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 compact, switchable antenna patterns and reduced size, addressing the impracticality of existing systems by minimizing antenna size and complexity while maintaining effective radiation performance across various frequency bands.
Implementation Method 1
the first resonant portion has a loop resonant structure or an open-slot resonant structure... exciting the first radiating edge to form a strong surface current distribution, and generating a first effective radiating energy
Data Source
AI summary
The disclosure provides a communication device. The communication device includes a ground conductor portion and a multi-antenna system. The multi-antenna system includes at least a first and a second resonant portion, each of which is disposed on the corresponding radiating edge of the ground conductor portion. Each of the resonant portions may have a loop resonant structure or may have an open-slot resonant structure, and has a resonant path. The electrically coupling portion makes the length of the resonant path less than or equal to 0.18 times the wavelength of the lowest operating frequency of the multi-antenna system, and thereby excites the corresponding radiating edge and forms a strong surface current distribution, and generates an effective radiating energy and at least one resonant mode, in which the effective radiating energy has a corresponding strongest radiation direction.