NFC Tag Shielding Layer for Multi-Layer Product Signal Isolation
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Solution Overview
Problem
NFC tags in multi-layered products, such as books and cards, can inadvertently communicate with each other due to the lack of electromagnetic shielding, leading to unintended data transfer when an NFC reader is used, as signals can pass through the tags without proper shielding.
Innovation Solution
Incorporating an RF shielding layer between operably aligned NFC tags, made of materials like aluminum or copper, to prevent signal interference by positioning it along the axis covering a localized area larger than the projected area of the tags, ensuring that signals intended for one tag do not reach adjacent tags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple NFC tags are placed in multi-layered products without shielding, then the product functionality is enhanced, but unintended signal interference and data transfer between tags occurs
Solution Approach 1:
The patent divides the multi-layered product into segmented zones by inserting RF shielding layers between NFC tags on different layers. This segmentation prevents electromagnetic signals from propagating between tags, isolating each tag's operational zone and eliminating unintended communication while preserving individual tag functionality.
Solution Approach 2:
The RF shielding layer acts as an intermediary element positioned between NFC tags on adjacent layers. This intermediary blocks electromagnetic field propagation, preventing direct signal transmission between tags while allowing each tag to maintain its intended communication capability with external NFC readers.
2Reliability
If an RF shielding layer is added between NFC tags, then signal interference is prevented, but the device complexity and manufacturing steps increase
Solution Approach 1:
The patent employs thin RF shielding films or foils as the shielding layer, which can be easily integrated into the existing multi-layered product structure. These flexible thin films provide effective electromagnetic shielding while adding minimal thickness and complexity to the overall device construction.
Solution Approach 2:
The shielding layer is constructed using composite material structures that combine conductive materials with substrate materials, creating an integrated shielding solution that can be applied during the existing manufacturing process without requiring separate complex assembly steps.
3Reliability
If the RF shielding layer covers a larger area than the NFC tag projected area, then complete signal blocking is achieved, but material usage and manufacturing cost increase
Solution Approach 1:
The RF shielding layer is positioned and dimensioned to provide localized shielding coverage. By extending the shielding area slightly beyond the NFC tag's projected area, the patent achieves complete signal blocking for the tag's operational zone while minimizing material consumption compared to full-layer shielding approaches.
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
Effectively shields NFC tags from each other, preventing unintentional data transfer and maintaining the intended functionality of each tag by ensuring that signals are not passed through the shielding layer, thus maintaining data privacy and operational integrity.
Implementation Method 1
an RF shielding layer disposed between the first and second on-metal NFC tags. The RF shielding layer is positioned along the axis and extends parallel to the first and second sheets a distance covering a localized projected area of the larger of the first or second on-metal NFC tag
Implementation Method 2
The active NFC-enabled device and the NFC tag each have a loop antenna that may be used to transmit power inductively from the active NFC-enabled device to the NFC tag to provide power to the NFC tag to power its electronics for communication with the active NFC-enabled device
Data Source
AI summary
An NFC tag shielding system for a multi-layer product of printed and/or non-printed layered material(s) includes a plurality of layers of printed and/or non-printed materials. The system includes a first on-metal NFC tag applied to a first layer of material of the plurality of layers and a second on-metal NFC tag applied to a second layer of material of the plurality of layers. The first and second on-metal NFC tags are aligned along an axis perpendicular to planes of the first and second layers of material. The system also includes an RF shielding layer disposed between the first and second on-metal NFC tags. The RF shielding layer is positioned along the axis and extends parallel to the first and second layers of material a distance covering at least a projected area of the larger of the first or second on-metal NFC tag. The RF shielding layer provides signal shielding between the NFC tags so that a user wishing to read the first NFC tag on the first layer of material will not unintentionally read the aligned second NFC tag on the second layer of material.