Coil Antennas Vertical Stacking Narrow Width
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Solution Overview
Problem
The narrow width of the second surface in electronic devices makes it difficult to dispose coils without overlapping, leading to parasitic resonance and degraded radiation performance.
Innovation Solution
The electronic device incorporates a housing structure with a first coil and a second coil, where the first coil is disposed between a printed circuit board and the second surface, and the second coil is also between the printed circuit board and the second surface, with patterns wound around axes parallel to each other, and a portion of the first pattern is extended from the periphery of the second pattern across a space formed inside the second pattern to prevent overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the second surface width is reduced to achieve a compact device, then the device size is reduced, but the coils cannot be disposed without overlapping
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar coil arrangement to a three-dimensional stacked configuration. The first and second coils are disposed at different heights relative to the second surface, with the first coil having its pattern extended across the space formed by the second pattern. This vertical stacking approach allows both coils to coexist in a narrow width device without overlapping in the planar view, effectively resolving the contradiction between compact size and manufacturability.
2Reliability
If the coils are disposed without overlapping to maintain radiation performance, then the radiation performance is maintained, but the device width must be increased
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension to separate the coils. The first coil pattern is extended from the periphery of the second pattern across the space formed inside the second pattern, creating a stacked arrangement where coils are separated in the height direction rather than requiring increased planar width. This maintains non-overlapping configuration for optimal radiation performance while preserving compact device dimensions.
Solution Approach 2:
The patent employs a nesting-like arrangement where the first coil pattern is disposed to extend across the space formed by the second pattern. The patterns are arranged concentrically or interlaced in the vertical stacking, allowing one coil structure to be nested within or alongside the other in the height direction, thereby maintaining compact width while preventing overlap.
3Length of stationary object
If the coils are overlapped to fit in narrow width, then the device width is reduced, but parasitic resonance occurs and radiation performance degrades
Solution Approach 1:
The patent eliminates parasitic resonance by transitioning from planar overlap to vertical stacking. The first and second coils are disposed at different heights with their patterns extended across each other's spaces in the vertical direction. This spatial separation in the height dimension prevents the electromagnetic coupling that causes parasitic resonance while maintaining compact device width.
Solution Approach 2:
The patent extracts the harmful overlapping interaction by separating the coils in the vertical dimension. By disposing the first coil pattern to extend across the space formed by the second pattern in a stacked configuration, the design removes the direct planar overlap that causes parasitic resonance, effectively extracting the harmful electromagnetic coupling from the system.
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 minimizes parasitic resonance and maintains desired radiation performance by ensuring the coils do not overlap, even with a narrow second surface width.
Implementation Method 1
a first coil disposed between the printed circuit board and the second surface and electrically connected to the printed circuit board and including a first pattern wound one or more times about a first axis parallel to the second direction, and a second coil disposed between the printed circuit board and the second surface and electrically connected to the printed circuit board and including a second pattern wound one or more times about a second axis parallel to the second direction
Data Source
AI summary
An electronic device is provided. The electronic device includes a housing structure including a first surface facing in a first direction and a second surface facing in a second direction opposite to the first direction, a display unit disposed at the first surface, a printed circuit board disposed inside the housing structure, a first coil disposed between the printed circuit board and the second surface and electrically connected to the printed circuit board and including a first pattern wound one or more times about a first axis parallel to the second direction, and a second coil disposed between the printed circuit board and the second surface and electrically connected to the printed circuit board and including a second pattern wound one or more times about a second axis parallel to the second direction.