NFC Coil Layout Around Metal Members for Reliable Card Reading
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Solution Overview
Problem
The performance of NFC antennas in portable and wearable electronic devices is degraded due to the presence of large-area metal members, which interfere with the transmission and reception of radio frequency signals, leading to difficulties in reading cards.
Innovation Solution
The NFC antenna design includes a first part and a second part arranged along the circumferential direction of the NFC coil, with the second part passing through the orthographic projection of the metal member, and optionally using a magnetic shielding sheet to enhance magnetic field distribution and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-area metal member is present on the NFC coil side to transmit and receive radio frequency signals, then the structural integrity and aesthetic appearance are maintained, but the performance of the NFC antenna is seriously degraded
Solution Approach 1:
The NFC coil is divided into a first coil and a second coil that are spatially separated and arranged in different regions. The first coil is positioned away from the metal member while the second coil is positioned closer to it, allowing each coil to operate in its optimal electromagnetic environment and collectively maintain NFC functionality despite the metal member's presence
Solution Approach 2:
The patent transitions from a single-plane coil configuration to a three-dimensional spatial arrangement where coils are distributed across different regions and depths. This dimensional expansion allows the NFC system to bypass the harmful electromagnetic interference from the metal member by utilizing multiple spatial zones
2Volume of moving object
If the NFC coil is placed close to the metal member to save space, then the device miniaturization is achieved, but the magnetic field distribution uniformity deteriorates
Solution Approach 1:
The NFC coil is segmented into multiple coils positioned at different distances from the metal member. This segmentation allows the system to maintain compact overall dimensions while creating a distributed coil structure that collectively generates a more uniform magnetic field across the NFC operating area
Solution Approach 2:
Different regions of the NFC coil structure are assigned different spatial positions relative to the metal member. The first coil is positioned in a region with less interference while the second coil operates in a region closer to the metal member, with each region optimized for its specific electromagnetic characteristics to achieve overall field uniformity
3Reliability
If a conventional single-coil NFC antenna is used, then the device structure is simple, but the card reading success rate is low due to metal member interference
Solution Approach 1:
The single NFC coil is segmented into multiple coils arranged in different spatial configurations. This segmentation improves card reading success rate by distributing the electromagnetic field generation across multiple coils that can collectively overcome the blocking effect of the metal member, despite increasing structural complexity
Solution Approach 2:
Multiple coils are merged into a unified NFC antenna system that functions as an integrated whole. The first coil and second coil work together in combination, with their electromagnetic fields superimposing to create a robust NFC signal that maintains high card reading success rate despite the presence of the metal member
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 design improves the uniformity of magnetic field distribution and enhances the performance of the NFC antenna by minimizing the impact of the metal member, thereby increasing the success rate of card reading.
Implementation Method 1
A near field communication (near field communication, NFC) technology has a wide application prospect in many fields because it supports contactless data transmission between wireless electronic devices
Implementation Method 2
A large-area metal member is generally present on a side that is of the NFC coil and that is used to transmit and receive radio frequency signals... performance of the NFC antenna is seriously degraded due to the metal member
Data Source
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AI summary
This application provides an electronic device and relates to the technical field of electronic devices, to reduce impact of a large-area metal member on an NFC antenna and ensure performance of the NFC antenna, so as to improve a success rate of reading a card. The electronic device includes an NFC antenna and a metal member. The NFC antenna includes an NFC coil, the NFC coil includes a first side, and the first side is one side of a plane in which the NFC coil is located. The metal member is located on the first side, the NFC coil includes a first part and a second part that are arranged along a circumferential direction of the NFC coil, the first part is located outside an orthographic projection that is of the metal member and that is on the plane in which the NFC coil is located, and is provided around the orthographic projection that is of the metal member and that is on the plane in which the NFC coil is located, and the second part passes through the orthographic projection that is of the metal member and that is on the plane in which the NFC coil is located. The electronic device provided in embodiments of this application is configured to implement near field communication.