Self-Adhering RFID Antenna Using Thin Aluminum Foil
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing RFID antennas are costly, environmentally harmful, and use non-recyclable materials, such as etching foil or applying metalizing, and printing with conductive ink, which are inefficient and harmful.
Innovation Solution
The production of RFID antennas using a thin aluminum foil with a thickness of 1 μm to 20 μm, preferably 10 μm, combined with a recyclable paper backing strip, allowing for efficient and cost-effective manufacturing using rotating tools in RFID machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If etching foil or metalizing or printing with conductive ink is used to produce RFID antennas, then the antenna can be manufactured, but the production is costly and environmentally harmful
Solution Approach 1:
The patent changes the material parameter from traditional etching foils, metalizing layers, or conductive inks to thin aluminum foil (1-20 μm thickness). This parameter change enables a simpler stamping process that eliminates costly and environmentally harmful chemical etching, metalizing procedures, and heavy metal-containing inks, while maintaining electrical conductivity for RFID antenna function
Solution Approach 2:
The patent employs inexpensive thin aluminum foil (1-20 μm) that can be easily stamped and discarded after use, replacing expensive and environmentally damaging materials like etching chemicals, metalizing coatings, and conductive inks containing heavy metals. The aluminum foil serves as a single-use, cost-effective substrate that simplifies the entire manufacturing process
2Ease of manufacture
If PET is used as the flat backing strip for RFID antennas, then the antenna can be manufactured, but the material is not recyclable
Solution Approach 1:
The patent changes the backing strip material parameter from non-recyclable PET to recyclable paper. This substitution maintains the structural function of supporting the thin aluminum foil antenna while enabling the entire assembly to be recycled, thus eliminating the waste problem associated with conventional PET-based RFID labels
Solution Approach 2:
The patent creates a composite structure combining thin aluminum foil (1-20 μm) with paper backing strip. This composite material approach allows the antenna to maintain electrical conductivity from the aluminum layer while the paper substrate provides recyclability, combining the advantages of both materials into a single functional unit
3Ease of manufacture
If thin aluminum foil is used to produce RFID antennas, then the production cost is reduced and recyclability is improved, but the electrical conductivity must be maintained
Solution Approach 1:
The patent optimizes the aluminum foil thickness parameter to the range of 1-20 μm, which is thin enough to reduce material cost and improve recyclability, yet thick enough to maintain sufficient electrical conductivity for RFID antenna operation. This parameter optimization balances cost reduction with functional reliability
Solution Approach 2:
The patent employs rotating stamping tools that create precisely contoured aluminum foil antennas through a rolling process. The curvature and precise shaping of the aluminum foil during rotation ensure optimal electrical pathways and antenna geometry, maintaining electrical conductivity while enabling high-speed, cost-effective production
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 approach enables the production of electrically optimized UHF antennas from recyclable materials at reduced costs, using compatible and environmentally friendly aluminum foil, while maintaining high electrical conductivity.
Implementation Method 1
The antenna is adhered to the front face of a strip- or sheet-shaped mounting layer preferably made of paper by means of an adhesive film
Data Source
AI summary
An RFID antenna assembly is made by first adhering a continuous aluminum foil between 1 μm and 20 μm thick by an adhesive film to a front face of a mounting layer, then providing on a back face of the mounting layer a film of contact adhesive, and then releasably securing to the mounting-layer back face a backing strip. The foil and the mounting layer but not the backing strip are then punched through so as to punch out antennas from the foil and identical pieces from the mounting layer. Finally the foil and mounting layer are stripped from around the punched-out antennas on the backing strip to leave on the backing strip a row only of the punched-out antennas and the respective pieces of the mounting layer.