Integrated RFID Textile Tags With Tuned Thread Antennas
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Solution Overview
Problem
Conventional RFID tag solutions for textile products face challenges such as difficulty in integration without damage, high failure rates during sewing, visibility and feelability, and irritation issues due to thickness and material stiffness, as well as ease of removal from garments.
Innovation Solution
The implementation of thin, machine-washable RFID tags with flexible fluid-resistant coatings and metal threads or traces integrated into the fabric during production, allowing for secure sewing and optimal antenna performance without irritation, using a substrate with a thickness between 0.0001 and 0.0005 inches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard sewing techniques are used to incorporate RFID tags into cloth, then the tags can be integrated using conventional methods, but the tags are damaged causing failure rates of 1-20%
Solution Approach 1:
The RFID tag is pre-encased in a protective housing before integration into the textile product. This preliminary protective action prevents damage during subsequent sewing and washing processes, eliminating the 1-20% failure rate associated with standard sewing techniques while maintaining ease of manufacture.
Solution Approach 2:
A protective housing or encapsulation material is introduced as an intermediary between the RFID tag and the sewing process. This intermediary protects the sensitive electronic components from mechanical damage during standard sewing operations, allowing conventional manufacturing methods to be used without compromising tag reliability.
2Strength
If a thick coating is applied to the wire for physical strength, then the RFID tag thread has sufficient durability, but the thread can be felt and seen after ironing
Solution Approach 1:
The RFID tag is encased in a thin, flexible protective shell or film that provides mechanical protection and durability without adding significant thickness. This thin encapsulation prevents the tag from being visible or palpable after ironing, while still providing sufficient physical strength for integration into textile products.
Solution Approach 2:
The thickness and material properties of the protective coating are optimized to achieve the right balance between strength and invisibility. By changing the physical parameters of the encapsulation material (making it thinner and more flexible), the solution eliminates visibility and feelability issues while maintaining adequate physical strength for sewing and washing.
3Ease of manufacture
If RFID tags are placed on care or brand labels, then the tags are easy to attach, but the tags can be easily removed using cutting tools and the labels cause irritation
Solution Approach 1:
The RFID tag is nested within or integrated into the seam structure of the textile product itself, rather than being attached to external labels. This nesting approach makes the tag difficult to remove without damaging the product, while the seamless integration eliminates irritation to the wearer. The tag becomes part of the garment structure rather than a separate attachable component.
4Measurement precision
If the RFID tag is installed in a seam of the garment, then tag detection is improved, but the integration process becomes more complex
Solution Approach 1:
The RFID tag is pre-positioned and secured within the seam structure before the final garment assembly. This preliminary action ensures optimal detection positioning while simplifying the overall integration process, as the tag is already in place and requires no additional complex steps during final garment construction.
Data Source
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AI summary
Systems and methods for integrating tags with items. The methods comprise: dynamically determining a length of each metal thread to be incorporated into or trace to be disposed on a item to optimize tag performance in view of dielectric and tuning properties of the item. In the metal thread scenarios, the methods also involve: creating a metal thread having the length that was dynamically determined; and sewing the metal thread into the item being produced to form an antenna for a first tag. In the trace scenarios, the methods also involve forming the trace on the item being produced to form an antenna for a first tag. Next, at least a communications enabled device is attached to the item so as to form an electrical coupling or connection between the communications enabled device and the at least one antenna.