Compact Wideband Antenna Element for Mobile Devices
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Solution Overview
Problem
Conventional wideband antenna elements require additional space due to the need for a predetermined distance from the ground plane, limiting their application in portable mobile communication devices like smartphones and tablets, where stable communication quality is crucial.
Innovation Solution
A low-profile wideband antenna element with a simple structure, comprising a first metal portion with multiple bends and a second metal portion, which are parallel to the edge of the ground element, allowing for high radiation efficiency and compact size, covering multiple frequency bands with a combination of resonant modes and an internal matching circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional wideband antenna element is used to maintain stable communication quality, then communication quality is improved, but the antenna height above the ground plane increases due to the required predetermined distance
Solution Approach 1:
The patent transitions from a conventional three-dimensional antenna structure requiring vertical clearance to a planar two-dimensional structure that operates effectively in close proximity to the ground plane. The antenna element is designed as a flat configuration with specific geometric features (radiating elements, ground elements, feeding structures) that enable wideband operation without vertical height, effectively moving the solution from 3D space to 2D plane.
Solution Approach 2:
The patent modifies the electrical parameters of the antenna structure by introducing specific geometric configurations including radiating elements with particular length-to-width ratios, ground elements with defined dimensions, and feeding structures with optimized impedance characteristics. These parameter changes enable the antenna to achieve wideband performance and high radiation efficiency while maintaining a low-profile configuration close to the ground plane.
2Loss of energy
If a conventional wideband antenna element is used to ensure high radiation efficiency, then radiation efficiency is improved, but the additional space required limits the application in portable devices
Solution Approach 1:
The patent employs a planar antenna design that concentrates the radiating function into a two-dimensional structure with minimal vertical profile. The antenna element, ground elements, and feeding structures are all configured in a flat arrangement that can be integrated into the thin profile of portable devices, eliminating the need for vertical space while maintaining radiation efficiency through optimized in-plane geometry.
Solution Approach 2:
The patent optimizes the dimensional parameters of the antenna components including the length, width, and spacing of radiating elements, ground elements, and feeding structures. These parameter optimizations enable the antenna to achieve high radiation efficiency by controlling current distribution and impedance matching, while the overall compact footprint minimizes the volume occupied within portable device constraints.
3Length of moving object
If the antenna element is placed close to the ground plane to reduce device thickness, then device thickness is reduced, but mutual coupling between the antenna and ground plane increases
Solution Approach 1:
The patent applies different structural characteristics to different parts of the antenna system: the radiating elements have specific geometric features optimized for radiation, the ground elements have defined configurations to control coupling, and the feeding structures have particular impedance characteristics. This local differentiation of structural quality allows the antenna to operate effectively close to the ground plane by managing mutual coupling through localized design features rather than requiring uniform spacing throughout the entire structure.
Solution Approach 2:
The patent controls mutual coupling by optimizing the electrical parameters of the antenna-ground interface, including the spacing between antenna elements and ground plane, the dimensions of ground elements, and the impedance characteristics of feeding structures. These parameter optimizations enable the system to achieve acceptable coupling levels at reduced heights by balancing the electrical interactions between components rather than relying solely on increased physical separation.
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 enables a compact, high-efficiency wideband antenna that can be integrated into thin mobile devices, providing stable communication across multiple bands with improved radiation efficiency and reduced height, meeting the demands of modern mobile communication systems.
Implementation Method 1
the second metal portion is close to the second segment of the first metal portion to excite the first metal portion
Implementation Method 2
the first metal portion generates a resonant mode in the first band, and further generates a first higher-order resonant mode and a second higher-order resonant mode in the second band
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A communication device includes a ground element and an antenna element. The antenna element is close to an edge of the ground element, and includes a first metal portion and a second metal portion. The first metal portion has a plurality of bends, and includes a first segment and a second segment. The first segment and the second segment are close to each other, and are substantially parallel to the edge of the ground element. The first segment is disposed at the outmost periphery of the antenna element from the edge of the ground element. The second segment is disposed between the first segment and the edge of the ground element, and has a shorted point coupled to the ground element. The second metal portion is disposed between the second segment and the edge of the ground element, and has a feeding point coupled to a signal source.