Dual-Coil Antenna Layout for NFC and Wireless Charging
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Solution Overview
Problem
Existing antenna devices experience strong unnecessary coupling between coils for non-contact charging and NFC antennas, leading to deteriorated performance and interference issues, particularly when users attempt to perform NFC communication while holding the device.
Innovation Solution
The design includes a rectangular housing with strategically positioned coils where the first coil overlaps with the second coil opening, and the center of gravity of the housing is within the first coil's formation region, allowing for adjustable directivity and reduced unnecessary coupling by optimizing the overlap and non-overlap areas of the coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil for non-contact charging and the coil for NFC antenna are coupled at four sides, then the structure is compact, but unnecessary coupling becomes strong and performance deteriorates
Solution Approach 1:
The patent applies local quality by making the coupling strength non-uniform around the coil periphery. Specifically, the coupling is made strong at two opposite sides and weak at the other two opposite sides, rather than uniform coupling at all four sides. This selective local variation in coupling strength allows compact arrangement while preventing excessive unnecessary coupling that would degrade non-contact charging performance.
Solution Approach 2:
The patent employs asymmetry by creating an asymmetric coupling pattern where adjacent coils have different coupling strengths at different positions. The first and second coils are arranged such that their coupling is strong at specific sides and weak at others, breaking the symmetric coupling pattern. This asymmetric arrangement reduces unnecessary coupling while maintaining compact module structure.
2Device complexity
If the NFC antenna is located at the center of the electronic apparatus, then the structure is simplified, but user's hand or finger interferes with the reader/writer and communication fails
Solution Approach 1:
The patent extracts the NFC antenna from the central position and relocates it to an edge position of the electronic apparatus. By taking out the NFC antenna from the center and placing it at the edge, the design eliminates interference from user's hand or finger that would occur at the center position, while maintaining a simplified single-antenna structure.
Solution Approach 2:
The patent changes the positional dimension of the NFC antenna from central (two-dimensional center) to edge (peripheral position). This dimensional relocation moves the antenna away from the interference zone created by user's hand or finger, improving communication availability without increasing structural complexity.
3Reliability
If the non-contact charging coil is arranged in the central portion, then the charging alignment is optimized, but the NFC antenna cannot be positioned for optimal communication sensitivity
Solution Approach 1:
The patent segments the functional zones by separating the non-contact charging coil (centered for optimal charging alignment) from the NFC antenna (positioned at edge for optimal communication sensitivity). This spatial segmentation allows each antenna to be optimally positioned for its specific function without compromising the other.
Solution Approach 2:
The patent resolves the positioning conflict by moving the NFC antenna to a different spatial dimension (edge position) relative to the centrally positioned charging coil. This dimensional separation enables both antennas to achieve optimal positioning for their respective functions simultaneously.
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 unnecessary coupling, enhances NFC communication availability, and allows for effective power transmission without interference from user interference or device orientation.
Implementation Method 1
a first coil (10) including a first coil conductor (11) defining a first coil opening (CO1) and a second coil (20) including a second coil conductor (21) defining a second coil opening (CO2)
Data Source
AI summary
An electronic apparatus includes a rectangular or substantially rectangular plate-shaped housing including a first side and a second side which are long sides and a third side and a fourth side which are short sides, and an antenna device. The antenna device includes a first coil including a first coil conductor and a second coil including a second coil conductor. A portion of the first coil overlaps with the second coil opening, a portion of the second coil overlaps with the first coil opening, a straight line connecting a center of gravity of the first coil opening and a center of gravity of the second coil opening intersects with the third side and the fourth side, and the center of gravity of the second coil opening is closer to the third side than the center of gravity of the first coil opening.