Planar Antenna Orientation in Metal Bezel Wrist Devices
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Solution Overview
Problem
Antenna-built-in portable devices face a trade-off between material feel and reception performance, as metal bezels can deteriorate antenna reception when used in designs that improve the material's luxurious feel, leading to reduced sensitivity and accuracy in satellite signal reception.
Innovation Solution
A portable device design featuring a planar antenna with its maximum radiation direction directed towards the outer side of a metal bezel, positioned to avoid overlap, and strategically sized gap dimensions to minimize interference, ensuring improved reception sensitivity and accuracy while maintaining a luxurious metallic design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a metal bezel is arranged around the glass to improve the luxurious feel and material design, then the aesthetic quality and material feel are improved, but the reception performance of the antenna section is deteriorated due to signal blockage
Solution Approach 1:
The patent resolves the contradiction by transitioning from a two-dimensional planar antenna layout to a three-dimensional spatial arrangement. The antenna is positioned at a specific height above the glass surface and angled relative to the bezel, creating vertical and angular separation. This dimensional change allows the antenna radiation pattern to extend beyond the bezel's horizontal blockage zone, enabling signal reception from satellite directions not obstructed by the metal structure.
Solution Approach 2:
The patent applies local quality by creating a localized non-metallic zone directly above the antenna position. The antenna is strategically positioned in a region where metal structures (bezel, glass edges) are minimized or absent, establishing a local area with favorable electromagnetic properties. This localized optimization ensures the antenna operates in a space with reduced metal interference while the rest of the device maintains its luxurious metal bezel design.
2Reliability
If the antenna section is made the same size as the liquid-crystal panel section to prevent eaves projection, then the reception performance is maintained, but the luxurious metal bezel design cannot be implemented
Solution Approach 1:
The patent moves the antenna design from a constrained two-dimensional plane (matching the display panel dimensions) to a three-dimensional configuration. By positioning the antenna at a specific height and orientation angle above the glass surface, the effective radiation area extends vertically and angularly beyond the horizontal footprint constraints. This allows a smaller horizontal antenna area to achieve equivalent or superior reception performance while enabling the implementation of a luxurious metal bezel around the glass.
3Reliability
If the antenna is positioned to avoid overlap with the bezel in the maximum radiation direction, then signal blockage is prevented and reception sensitivity is improved, but the design flexibility is reduced
Solution Approach 1:
The patent applies dynamics by making the antenna system adaptable through adjustable positioning and orientation parameters. Rather than fixing the antenna in a single rigid position, the design allows optimization of height above glass, angular orientation relative to the bezel, and horizontal placement. This dynamic configuration approach enables the antenna to be positioned to avoid bezel blockage in the maximum radiation direction while maintaining design flexibility to accommodate different device sizes, bezel configurations, and aesthetic requirements.
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 satellite signal reception sensitivity and accuracy by preventing signal blockage from the metal bezel while allowing direct satellite signal reception and reducing multipath interference, while also providing a luxurious design and improved material feel.
Implementation Method 1
The antenna is a planar antenna, a maximum radiation direction of which is arranged to be directed toward the outer side of the bezel crossing the thickness direction of the armor case
Implementation Method 2
At least a part of the antenna overlaps at least a part of the bezel in the thickness direction of the armor case... a radio wave made incident on the antenna from the thickness direction can be cut off by the metal bezel
Data Source
AI summary
A wrist device, which is an antenna built-in portable device, includes an armor case including an opening at least on the front surface side, glass that closes the opening, a metal bezel attached to the front surface of the armor case and arranged around the glass, and an antenna arranged in a space on the inner side of the armor case. The antenna is a planar antenna, a maximum radiation direction of which is arranged to be directed toward the outer side of the bezel crossing the thickness direction of the armor case. The antenna is arranged in a position not overlapping the bezel in the maximum radiation direction of the antenna. At least a part of the antenna overlaps at least a part of the bezel in the thickness direction of the armor case.