Floating Radiation Element for Mobile Device Antenna Efficiency
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Solution Overview
Problem
Antenna elements in mobile devices are often interfered with by nearby metal components, leading to poor communication quality due to interference, which affects the radiation efficiency and coverage of wireless communication frequencies.
Innovation Solution
A mobile device with an antenna structure that includes a floating radiation element adjacent to the antenna elements, enhancing radiation efficiency by utilizing a nonconductive frame and conductive housing with specific geometric configurations and coupling gaps to improve radiation patterns across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antenna elements are placed near metal components in mobile devices, then the device structure is compact, but the metal components interfere with the antenna element and result in poor communication quality
Solution Approach 1:
The patent introduces a nonconductive frame as an intermediary component between the antenna element and metal components. This frame acts as a mediator that prevents direct electromagnetic interference from metal components to the antenna element, thereby maintaining communication quality while allowing compact device design. The nonconductive material blocks the harmful electromagnetic coupling between metal parts and the antenna.
Solution Approach 2:
The patent applies different material properties to different regions: the frame is made of nonconductive material specifically at the antenna region to provide electromagnetic isolation, while other parts of the device can use conductive materials for structural integrity and shielding. This localized application of material properties solves the interference problem without compromising overall device performance.
2Reliability
If a nonconductive frame is used to isolate antenna from metal components, then communication quality improves, but the antenna radiation efficiency decreases
Solution Approach 1:
The patent introduces a floating radiation element that extends in the vertical dimension (z-axis) above the antenna element. This third-dimensional structure provides additional radiation paths and enhances the overall radiation efficiency without interfering with the horizontal electromagnetic isolation provided by the nonconductive frame. The floating element creates a multi-dimensional antenna system that overcomes the energy loss caused by the nonconductive frame.
3Length of moving object
If antenna element length is reduced to fit compact device, then device size decreases, but antenna radiation efficiency and coverage are reduced
Solution Approach 1:
The patent employs a nested structure where the floating radiation element is positioned above and coupled to the compact antenna element. The shorter antenna element serves as the base, and the floating element is nested in the vertical space above it. This nested arrangement allows the system to achieve enhanced radiation efficiency equivalent to a longer antenna while maintaining the compact horizontal footprint required for small device form factors.
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 addition of a floating radiation element improves radiation efficiency by 0.5 dB to 1 dB in the first frequency band and more than 1 dB in the second frequency band, effectively addressing interference issues and enhancing communication quality across wideband operations.
Implementation Method 1
The floating radiation element is adjacent to the first radiation element and the second radiation element, and is configured to enhance the radiation efficiency of the antenna structure
Data Source
AI summary
A mobile device includes a body, an antenna structure, and a floating radiation element. The body includes a frame and a housing. The frame is positioned on a first plane. The housing includes a parallel region and a cutting retraction region. The parallel region is positioned on a second plane which is parallel to the first plane. The floating radiation element is adjacent to the antenna structure, and is configured to enhance the radiation efficiency of the antenna structure. The antenna structure has a first vertical projection on the housing, and the first vertical projection is inside the parallel region. The floating radiation element has a second vertical projection on the housing, and the second vertical projection is inside the cutting retraction region. The frame is at least partially made of a nonconductive material. The housing is at least partially made of a conductive material.