Fibrous RFID Insert Antenna Tamper Resistance
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Solution Overview
Problem
Existing security document inserts with RFID devices lack comprehensive tamper resistance, mechanical protection, and humidity resistance, often allowing for easy removal or delamination, and do not ensure planarity, leading to overthickness issues.
Innovation Solution
A multilayer insert with a wire antenna integrated into a fibrous substrate comprising a high proportion of natural fibers and synthetic fibers, coated with a thermoplastic binder and mineral fillers, providing cohesion, flexibility, and enhanced adhesive properties for secure bonding with other substrates, while preventing delamination and tampering attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a multilayer structure with thermoplastic substrates is used, then adhesive bonding is improved, but tamper resistance deteriorates
Solution Approach 1:
The patent uses a composite substrate consisting of a thermoplastic base layer combined with a fibrous reinforcement layer (such as polyester or aramid fibers). This composite structure maintains the adhesive bonding properties of the thermoplastic material while the fibrous reinforcement provides enhanced mechanical strength and tamper resistance, preventing easy delamination and structural failure during tampering attempts.
Solution Approach 2:
The patent modifies the thermal and mechanical parameters of the substrate by incorporating materials with specific glass transition temperatures and fiber orientations. The substrate is designed to maintain flexibility at operating temperatures for proper adhesive bonding, but exhibits increased rigidity and structural integrity when subjected to tampering forces, thereby achieving both ease of manufacture and tamper resistance.
2Shape
If the insert is made planar, then overthickness is reduced, but mechanical protection deteriorates
Solution Approach 1:
The patent employs a thin-film multilayer structure where each layer is optimized for specific functions. The substrate uses a planar design with integrated recesses that accommodate the RFID antenna and electronic components, maintaining overall planarity while providing mechanical protection through the distributed multilayer construction rather than thick individual layers.
Solution Approach 2:
The patent divides the protective structure into multiple thin functional layers including substrate layers, adhesive layers, and protective coatings. Each layer contributes to mechanical protection while maintaining planarity, with recesses strategically positioned to house components without creating protrusions. The segmented structure provides cumulative protection equivalent to thicker single layers while preserving a flat profile.
3Ease of operation
If natural fibers are used in high proportion, then flexibility is improved, but strength deteriorates
Solution Approach 1:
The patent creates a composite fibrous material combining natural fibers (such as cotton or cellulose) with synthetic fibers (such as polyester or aramid). The natural fiber component provides flexibility and comfort, while the synthetic fiber reinforcement contributes tensile strength and structural cohesion. The synergistic combination allows the substrate to bend and flex without compromising its structural integrity or resistance to mechanical failure.
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 robust mechanical and chemical protection, tamper resistance, and planarity, preventing delamination and tampering, while maintaining flexibility and compatibility with security documents, ensuring reliable operation of the RFID device.
Implementation Method 1
a coated paper comprising a fibrous base formed with at least 30% by mass of natural bulk fibers, the antenna being firmly secured to the face of the flexible substrate, the paper including on this face at least one surface layer comprising at least one mineral filler and a coating binder
Implementation Method 2
the wire antenna should be able to be firmly secured to a substrate of the insert via an adhesive layer
Implementation Method 3
it is desirable that the insert have on its outer faces, sufficient high surface energy and sufficient absorption capacity in order to promote assembling by adhesively bonding the insert with other substrates
Data Source
AI summary
An assembly includes a wire antenna including at least on conductive turn, a first fibrous substrate on which the antenna extend. The first substrate comprises at least one coated paper including a fibrous base containing at least 30 mass % of natural fibers in the fibrous mass. The antenna is connected to a face of the flexible substrate. The paper includes on that face at least one surface layer containing at least one mineral load and a coating binder. The fibrous base may contain at least 40 mass %, preferably 50 mass %, more preferably 60 mass % and ideally at least 70 mass % of natural fibers, with preferably a lower proportion of long natural fibers relative to short ones when the fibrous mass includes synthetic fibers, in particular between 5 and 25% of synthetic fibers.