Unclonable Chipless RFID Tag With Slot Resonators
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Solution Overview
Problem
Current track-and-trace technologies in supply chains face challenges such as high costs, inefficiencies, and security vulnerabilities, particularly with traditional barcode and RFID systems, which are costly, require direct line of sight, and have deterministic and predictable IDs, limiting their effectiveness for low-cost commodities and temperature monitoring.
Innovation Solution
Development of unclonable chipless RFID tags with randomly deviating resonance frequencies, integrated with temperature-sensitive substrates, enabling unique and secure identifiers that can monitor storage temperature and resist cloning and denial-of-service attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RFID tags with microchips are used, then security and privacy are enhanced through encryption, but the cost increases significantly
Solution Approach 1:
The patent employs chipless RFID tags made from inexpensive materials such as conductive paint, carbon black, or metallic particles deposited on substrates. These tags eliminate the need for expensive microchips while maintaining sufficient security through physical unclonability via randomly positioned resonators, making them suitable for low-cost commodities in supply chain tracking
Solution Approach 2:
The patent replaces the electronic microchip-based RFID system with a passive resonator-based system. Instead of using active electronic components with encryption algorithms, the security is achieved through the physical arrangement and random positioning of resonators that create unique electromagnetic signatures, substituting electronic security mechanisms with physical-geometric ones
2Ease of manufacture
If barcodes and QR codes are used for tracking, then cost is reduced, but security is compromised due to ease of duplication and requirement of direct line of sight
Solution Approach 1:
The patent replaces optical codes (barcodes, QR codes) with electromagnetic resonator-based tags. The resonators interact with electromagnetic waves to produce unique frequency signatures that are inherently secure against optical copying, eliminating the need for direct line of sight while maintaining low cost
Solution Approach 2:
The patent transforms the information encoding from visual/optical parameters (pixel patterns in barcodes/QR codes) to electromagnetic resonance parameters (frequency signatures). This parameter transformation makes the identification system immune to optical copying attacks while keeping the implementation cost low
3Adaptability or versatility
If resonators are removed or shorted to encode data in chipless RFID tags, then data encoding is achieved, but manufacturing time and cost increase
Solution Approach 1:
The patent pre-positions resonators at random locations during the initial manufacturing process. This preliminary random placement creates unique identifiers without requiring subsequent modification steps. The resonators are positioned during the base tag fabrication, eliminating the need for later laser cutting or etching operations to encode data
Solution Approach 2:
The manufacturing process itself generates the unique identifier through random resonator positioning inherent in the fabrication process. The system serves its own encoding function by using the natural variations in resonator placement during manufacturing, eliminating the need for separate post-processing encoding steps
4Ease of manufacture
If conventional chipless RFID tags are used, then cost is reduced, but the IDs are deterministic and predictable making them easily clonable
Solution Approach 1:
The patent incorporates random number generators or uses inherent manufacturing variations (such as random positioning of conductive elements during deposition processes) to create non-deterministic resonator configurations. This preliminary randomization ensures that even identical tags manufactured under the same conditions will have different resonator arrangements and thus different identifiers, preventing cloning
Solution Approach 2:
Instead of using deterministic algorithms to generate IDs (which can be cloned), the patent inverts the approach by using random physical configurations that are impossible to replicate. The identifier is not generated through computational algorithms but through physical randomness in resonator placement, making the system secure against cloning attacks
5Adaptability or versatility
If temperature monitoring is added to chipless RFID tags, then environmental tracking capability is enhanced, but device complexity increases
Solution Approach 1:
The patent makes the resonator system serve multiple functions: the same resonators that provide unique identification also serve as temperature sensors. Temperature changes affect the resonance frequency of the resonators in a predictable manner, allowing the identification system to simultaneously perform environmental monitoring without adding separate sensing components
Solution Approach 2:
The patent exploits the temperature-dependent electrical properties of the resonator materials and substrate. Temperature changes cause measurable shifts in resonance frequency, allowing the system to encode temperature information in the same electromagnetic resonance signatures used for identification, thereby achieving multi-functionality without additional complexity
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 provides cost-effective, secure, and efficient tracking and authentication of products, enhancing supply chain security and temperature monitoring without the need for complex processing or direct line of sight, while reducing manufacturing time and costs.
Implementation Method 1
each slot resonator has a characteristic resonance frequency value that randomly deviates from a theoretical resonance frequency value determined by the geometric dimensions and material properties of both the slot resonators and the first substrate
Implementation Method 2
an additional ring slot resonator fabricated on a second substrate that is responsive to increase in temperature of the tag
Data Source
AI summary
Chipless RFID tags and methods of using the same are provided. Each RFID tag provided herein can generate a unique and unclonable (unclonable chipless RFID, or UCR) identifier from its intrinsically random manufacturing process. The UCR device can monitor increase in storage temperature beyond that which is appropriate for a specific commodity to which the device is attached.