Rectangular Coil Antenna Layout for Stable IC Card Communication
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Solution Overview
Problem
Existing antenna devices for IC cards experience unstable communication due to the circular shape of the antenna coil, which affects performance based on the coil's position within the card.
Innovation Solution
An antenna device with a first coil pattern having specific turns with varying opening widths and a second coil pattern for wireless power transmission, where the first coil pattern acts as a booster antenna and the second as a main antenna, optimized to maintain communication stability regardless of the coil's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular antenna coil is used, then the antenna structure is simple and easy to manufacture, but communication stability deteriorates depending on the position of the antenna coil in the IC card
Solution Approach 1:
The patent applies asymmetry by changing the antenna coil from a circular shape to a rectangular shape with specific aspect ratio (width larger than length). This asymmetric rectangular configuration creates more stable magnetic flux distribution that is less sensitive to the position of the IC card, thereby improving communication stability while maintaining manufacturing simplicity through standard PCB trace routing patterns.
Solution Approach 2:
The patent applies local quality by optimizing specific geometric parameters of the rectangular antenna coil, including the aspect ratio of width to length, trace width, and spacing between turns. These localized parameter optimizations ensure stable communication characteristics across different IC card positions without requiring complex overall structural changes.
2Reliability
If multiple coil patterns are added to improve communication characteristics, then communication stability improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the antenna system into two functional parts: a first rectangular coil pattern optimized for NFC communication and a second coil pattern for wireless power transmission. This segmentation allows each coil to be independently optimized for its specific function while maintaining overall system simplicity through modular design and clear functional separation.
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
The solution ensures satisfactory communication characteristics and reduces coupling between coils, enhancing stability and efficiency in NFC-based communication and wireless power transmission.
Implementation Method 1
an antenna device including a first coil pattern having first to third turns... a second coil pattern... the first coil pattern acts as a booster antenna and the second as a main antenna
Data Source
AI summary
Disclosed herein is an antenna device that includes a first coil pattern having at least first, second, and third turns. As viewed in a coil axis direction, each of the first, second, and third turns has an opening with a width larger in a first direction than in a second direction orthogonal to the first direction. The width of the opening of the second turn in the second direction is larger than a width of the opening of the first turn in the second direction. The width of the opening of the third turn in the second direction is larger than the width of the opening of the second turn in the second direction and smaller than a width of the opening of the first turn in the first direction.