Chipless RFID Encoding via Selective Resonator Shorting
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Solution Overview
Problem
Current methods for producing customized chipless RFID tags are costly and inefficient due to the need for high-resolution printing and expensive conductive materials, as well as the limitations of inkjet technology in patterning resonant structures effectively.
Innovation Solution
A method involving the use of conductive ink to short specific resonant structures on chipless RFID transponders, shifting their spectral signature, which allows for lower-cost manufacturing using existing printers and lithographic techniques, without requiring high-resolution line width uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inkjet printing is used to print customized RFID antennas, then manufacturing cost is reduced, but manufacturing precision deteriorates due to inadequate resolution and non-uniform printed structures
Solution Approach 1:
The resonant structures are divided into multiple segments or zones along their length. Instead of requiring uniform conductive material deposition across the entire structure, the patent applies conductive ink selectively to specific segments. This segmentation allows the use of lower-resolution printing while still achieving the necessary electrical connectivity for RFID functionality.
Solution Approach 2:
The patent applies different levels of conductive material deposition to different parts of the resonant structures. High-conductivity material is applied only where critical for electrical connectivity, while other areas use lower-conductivity material or no material at all. This local differentiation maintains functionality while reducing overall material cost and printing precision requirements.
2Ease of manufacture
If low-cost conductive ink particles are used, then manufacturing cost is reduced, but reliability deteriorates due to varying particle size affecting interconnectivity
Solution Approach 1:
The patent changes the key parameter from particle size uniformity to deposition pattern control. Instead of relying on uniform small particles to ensure connectivity, the system uses controlled deposition of larger, cheaper particles in specific patterns that guarantee electrical pathways. This parameter shift allows use of low-cost materials while maintaining reliability through process control rather than material uniformity.
Solution Approach 2:
The patent performs preliminary design and simulation to determine the minimum necessary conductive pathways before actual printing. By pre-calculating which areas require conductivity and to what extent, the system can apply low-cost particles only where needed, ensuring interconnectivity is achieved with cheaper materials that would otherwise be unreliable.
3Manufacturing precision
If high-resolution printing is used to ensure uniform line width, then manufacturing precision is improved, but manufacturing cost increases due to expensive equipment and materials
Solution Approach 1:
The patent applies conductive ink partially rather than uniformly across entire resonant structures. By depositing material only in critical segments where connectivity is essential, the system achieves sufficient electrical performance with lower printing resolution, eliminating the need for expensive high-resolution equipment while maintaining functional precision.
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 reduces manufacturing costs and improves the reliability of RFID tags by enabling the use of low-cost, low-conductivity materials and existing printing technologies, while maintaining effective frequency shifting for identification purposes.
Implementation Method 1
depositing a conductive material on at least one of the resonant structures to short the at least one of the resonant structures
Implementation Method 2
a plurality of resonant structures that together define a first spectral signature. Each of the plurality of resonant structures includes a respective one of a frequency domain
Data Source
AI summary
Provided is a method for encoding chipless RFID tags in real-time. The method includes exposing a chipless RFID transponder to a conductive material, the RFID transponder comprising an antenna and a plurality of resonant structures, the plurality of resonant structures together defining a first spectral signature. Each of the plurality of resonant structures includes a respective one of a frequency domain. The method also includes depositing a conductive material on at least one of the resonant structures to short the at least one of the resonant structures. The remainder of the plurality of resonant structures that are not shorted by the conductive material define a second spectral signature for the RFID transponder.