Wireless Tag Coupling Using a Slit Conductive Ring
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Solution Overview
Problem
Conventional wireless communication systems with coil antennas face challenges in achieving sufficient coupling between the coil antenna and the wireless communication tag, particularly due to the positional arrangement of components, which limits the size reduction and functionality of communication terminals.
Innovation Solution
A wireless communication system is designed with a coil antenna in a first unit and a wireless communication tag in a second unit, where a conductive ring with a slit is used to enhance coupling by positioning the conductive ring closer to the wireless communication tag than the coil antenna, allowing magnetic flux to take a longer path and increase interlinkage, thereby improving coupling regardless of the tag's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil antenna and wireless communication tag are positioned with coincident winding axes, then coupling is achieved, but the device size cannot be reduced and functional flexibility is limited
Solution Approach 1:
The patent applies asymmetry by positioning the conductive ring at an offset from the coil antenna's center axis. Specifically, the conductive ring is located at a position where the distance to the wireless communication tag is shorter than the distance from the coil antenna to the tag, creating an asymmetric magnetic flux path that enhances coupling without requiring coaxial alignment. This asymmetric positioning enables reduced device size while maintaining reliable communication.
2Adaptability or versatility
If the coil antenna and wireless communication tag are positioned far apart, then device functionality is flexible, but coupling between them becomes insufficient
Solution Approach 1:
The patent introduces a conductive ring as an intermediary element between the coil antenna and the wireless communication tag. This conductive ring acts as a magnetic flux guide that extends and concentrates the magnetic field from the coil antenna toward the tag. By positioning the conductive ring closer to the tag than the coil antenna, it creates an extended magnetic flux path that maintains strong coupling even when the tag is positioned at greater distances or with flexible positional arrangements.
3Adaptability or versatility
If the wireless communication tag is positioned at various circumferential positions, then design flexibility is improved, but sufficient coupling is not achieved
Solution Approach 1:
The patent applies local quality by creating a concentrated magnetic flux path through the conductive ring at a specific location offset from the coil antenna center. The conductive ring is positioned to create locally enhanced magnetic field density in the region where the wireless communication tag is located. This localized magnetic flux concentration ensures strong coupling regardless of the tag's circumferential position, enabling design flexibility while maintaining reliable communication.
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 coupling between the coil antenna and the wireless communication tag, allowing for improved communication performance and flexibility in device design, regardless of the tag's position, and facilitates efficient magnetic flux induction.
Implementation Method 1
information is sent and received by a coupling between the coil antenna and the wireless communication tag
Implementation Method 2
allowing magnetic flux to take a longer path and increase interlinkage, thereby improving coupling
Data Source
AI summary
A wireless communication system is provided that includes a first unit, a coil antenna, a conductive ring, a second unit, and a wireless communication tag. A first coil conductor of the coil antenna is disposed along a first side surface of the first unit. The conductive ring is disposed along the first side surface of the first unit and has a slit. The second unit has a second side surface and is fixed to the first unit so as to be removable from the first unit in a first direction. The wireless communication tag includes a second coil conductor and is disposed along the second side surface of the second unit. In the first direction, a first shortest distance between the conductive ring and the second coil conductor is shorter than a second shortest distance between the first coil conductor and the second coil conductor.