Continuous Metallic Ring Antenna for Wearable Devices
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Solution Overview
Problem
In portable electronic devices, such as wrist-worn communication devices, the presence of metallic structures like bezels or bands can significantly degrade antenna performance due to electromagnetic interference, making it challenging to design effective antennas while maintaining aesthetic and mechanical requirements.
Innovation Solution
A continuous metallic component is used as an antenna, electrically connected to a circuit card assembly through an interconnection and an antenna matching circuit, allowing the metallic component to resonate at desired frequencies without requiring a non-continuous design, thus overcoming the limitations of metallic structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a continuous metallic ring or loop shaped structure is used in the device, then aesthetic purposes and mechanical design requirements are satisfied, but antenna performance is significantly degraded due to electromagnetic interference
Solution Approach 1:
The patent divides the continuous metallic ring into multiple discrete metallic segments separated by non-conductive gaps. This segmentation allows the structure to maintain its aesthetic continuous appearance while electrically functioning as a non-continuous antenna element, thereby resolving the contradiction between maintaining the ring shape and achieving acceptable antenna performance.
2Reliability
If the metallic ring structure is made non-continuous to function as an antenna, then antenna performance is improved, but the ability to maintain arbitrary lengths and aesthetic continuity is lost
Solution Approach 1:
The patent applies local quality by making specific portions of the ring structure (the gaps between segments) non-conductive while keeping the metallic segments themselves continuous and aesthetically pleasing. This allows the antenna to have the necessary electrical discontinuity for proper function while maintaining the appearance of a continuous ring structure in most areas.
3Volume of moving object
If the antenna is placed close to the metallic structure, then device size is reduced, but antenna radiation and reception capability is inhibited
Solution Approach 1:
The patent converts the potentially harmful effect of the metallic ring structure into a beneficial antenna element. By treating the metallic ring segments as the antenna itself rather than as interference, the design eliminates the need to separate the antenna from the metallic structure, allowing close proximity while maintaining or improving antenna 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
This solution enables the use of continuous metallic components as effective antennas in portable devices, improving communication performance while maintaining the desired form factors and aesthetics, and allowing for arbitrary lengths that do not need to correspond to specific wavelengths.
Implementation Method 1
the antenna matching circuit and the interconnection causing the continuous metallic component to resonate at an at least one desired frequency
Data Source
AI summary
An antenna apparatus for a wireless device includes a continuous metallic component electrically connected to a circuit card assembly through an interconnection, an antenna matching circuit electrically connected to the continuous metallic component, a first electrical connection between the continuous metallic component and the interconnection, and at least one additional electrical connection between the interconnection and the circuit card assembly, the antenna matching circuit and the interconnection causing the continuous metallic component to resonate at an at least one desired frequency.