Nested Coil Structure for Wireless Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In electronic devices with multiple coils for supporting various wireless communication technologies, such as NFC, MST, and wireless charging, interference between coils leads to performance degradation, affecting communication efficiency and recognition regions.
Innovation Solution
The electronic device incorporates a flexible printed circuit board with a first coil having three portions, where the second coil surrounds the first coil, and the third coil surrounds the second coil, with a part of the third coil positioned between the second and first coils, and a control circuit to manage signal transmission using each coil, reducing interference and enhancing communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple coils are arranged together in a small electronic device to support multiple wireless communication technologies, then the device can provide various wireless services (NFC, MST, wireless charging), but the performance deteriorates due to interference between the coils
Solution Approach 1:
The patent implements a nested coil structure where the first coil is positioned inside the second coil, and the third coil is positioned inside the second coil but outside the first coil. This nested arrangement allows multiple coils to coexist in a compact space while maintaining distinct electromagnetic fields for different communication functions, thereby supporting multiple wireless services without significant performance degradation
Solution Approach 2:
The patent assigns different functional characteristics to different regions of the coil structure. The first coil is optimized for NFC communication, the second coil for wireless charging, and the third coil for MST communication. By localizing specific communication functions to specific coil regions and optimizing each region's electromagnetic properties, the system achieves multi-functionality while minimizing interference between different communication modes
2Volume of moving object
If multiple coils are placed close together to reduce device size, then the device becomes more compact, but interference between coils increases and performance degradation occurs
Solution Approach 1:
The nested coil configuration allows three separate coils to occupy overlapping spatial regions rather than requiring separate physical spaces. The first coil is nested within the second coil, and the third coil is nested within the second coil but external to the first coil. This arrangement dramatically reduces the overall volume occupied by the coil assembly while maintaining sufficient electromagnetic field separation to minimize interference
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement to resolve coil interference. By positioning coils at different depths and orientations within the device housing, and by using the nested configuration, the system effectively adds spatial dimensionality to the coil layout. This dimensional approach allows compact packaging while maintaining electromagnetic field isolation between different communication functions
3Reliability
If coils are arranged in a nested configuration to reduce interference, then communication performance improves, but the device complexity increases
Solution Approach 1:
While the nested configuration does increase structural complexity compared to simple linear arrangements, it actually simplifies the overall device architecture by eliminating the need for complex shielding structures, isolation barriers, or active interference cancellation systems. The nested geometry inherently provides electromagnetic field separation, reducing the need for additional complexity-mitigating components
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 reduces interference between coils, enlarges the recognition region, and improves communication performance by shielding and optimizing the electromagnetic field distribution, thereby enhancing the overall performance of multiple communication methods.
Implementation Method 1
a first coil, comprising at least a first portion, a second portion and a third portion... a second coil... and a third coil... the control circuit is configured to: transmit a signal outward by a first transmission method using the first coil; transmit a signal outward by a second transmission method using the second coil; and transmit a signal outward by a third transmission method using the third coil
Implementation Method 2
the second coil surrounds the first portion of the first coil, the second portion of the first coil surrounds the second coil, the third portion of the first coil surrounds the second portion of the first coil... This configuration reduces interference between coils... by shielding and optimizing the electromagnetic field distribution
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed are various embodiments related to an electronic device including a coil. The electronic device may include: a housing including a first face facing a first direction and a second face facing a second direction different from the first direction; and a flexible printed circuit board and a control circuit disposed between the first and second faces. The flexible printed circuit board may include a first coil including at least one turn, a second coil including at least one turn, and a third coil including at least one turn. At least a part of the second coil may surround a first portion of the first coil, a second portion of the first coil may surround at least a part of the second coil, a third portion of the first coil may surround the second portion of the first coil, and at least a part of the third coil may be disposed between at least a part of the second portion of the first coil and at least a part of the third portion of the first coil. The control circuit may be configured to: transmit a signal outward by a first transmission method using the first coil; transmit a signal outward by a second transmission method using the second coil; and transmit a signal outward by a third transmission method using the third coil.