Wrist Device Ring Antenna Layout to Prevent Electric Field Loss
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Solution Overview
Problem
Existing wristwatch devices capable of receiving satellite radio waves face challenges in achieving desired antenna characteristics due to the materials and structures of the body case, leading to issues with antenna gain and sensitivity, as the electric field passing through the body case causes loss, especially when composite materials with carbon fillers are used.
Innovation Solution
Incorporating a ring-shaped antenna element, a conductive part with the same potential as GND, and a dielectric member interposed between the antenna element and the conductive part, which are disposed on top of each other, to prevent electric field loss and maintain antenna sensitivity, while allowing for various materials to be used for the body case without compromising antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the body case is made of composite materials with carbon fillers, then design flexibility and appearance variations are improved, but antenna gain and sensitivity deteriorate due to electric field loss
Solution Approach 1:
A dielectric member is introduced as an intermediary between the antenna element and the body case. This dielectric member prevents the electric field from penetrating into the carbon-containing composite material of the body case, thereby eliminating the harmful interaction between the antenna and the carbon fillers while still allowing the body case to be made of flexible composite materials for design purposes
2Ease of manufacture
If the body case material allows electric field passage, then manufacturing simplicity is improved, but antenna gain deteriorates due to electric field loss
Solution Approach 1:
The dielectric member serves as a barrier that blocks the electric field from entering the body case material. This prevents energy loss through the body case while maintaining manufacturing simplicity, as the dielectric member can be easily integrated into the existing body case structure
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 configuration enhances antenna gain and sensitivity by preventing electric field loss through the body case, regardless of the material used, and allows for design flexibility and water-tightness, enabling rich variations in the timepiece's appearance and functionality.
Implementation Method 1
a dielectric interposed between the antenna element and the conductor
Data Source
AI summary
An electronic device includes a ring-shaped antenna element, a conductor and a dielectric. The conductor has the same potential as GND. The dielectric is interposed between the antenna element and the conductor. The antenna element, the dielectric and the conductor are disposed so as to lie on top of one another in plan view.