Tamper-Evident RFID Tag with Frangible Circuit Board
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Solution Overview
Problem
Existing RFID tags with sophisticated circuitry and antennas face challenges in tamper-proofing, as they require external enclosures for environmental protection and specific mechanical attachment features, making them difficult to install and prone to false triggering from mechanical shock or vibration, and lack a reliable, easy-to-activate destruct mechanism.
Innovation Solution
A tamper-proof RFID tag with a circuit board featuring a frangible portion, a trigger arming mechanism, and a force-producing mechanism, where attachment to a surface automatically arms the mechanism, ensuring environmental protection and preventing accidental actuation, and a latch that releases the force-producing mechanism upon tampering, fragmenting the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sophisticated RFID tags with circuit boards are used for monitoring critical items, then tag functionality and data storage capability are improved, but tamper-proofing becomes more difficult and requires complex mechanical attachment features
Solution Approach 1:
The circuit board is pre-scored with fracture lines and pre-weakened at specific locations during manufacturing. The frangible mounting tabs are pre-configured to break along predetermined fracture lines when removal force is applied, ensuring reliable tag destruction without requiring complex active tamper-proofing mechanisms.
Solution Approach 2:
The circuit board is divided into functionally separate regions: a rigid portion containing the RFID circuitry and a frangible portion with mounting tabs that are designed to break away. This segmentation allows the tag to maintain functionality during normal use while enabling simple, reliable destruction upon tampering attempts.
2Ease of manufacture
If the RFID tag is mounted externally on the item being monitored, then ease of installation is improved, but environmental sealing and tamper prevention become more difficult
Solution Approach 1:
The mounting tabs are integrated directly into the circuit board structure rather than being separate components. The frangible tabs extend from the circuit board edge and are designed to break along predetermined fracture lines, combining the mounting function with the destruction mechanism in a single integrated structure.
Solution Approach 2:
The frangible mounting tabs are designed as disposable, single-use mounting elements that are intentionally weakened to break upon removal attempts. This approach uses simple, inexpensive frangible structures rather than complex reusable mounting mechanisms, achieving reliable tamper evidence through controlled breakage.
3Reliability
If the circuit board is made frangible to facilitate controlled breakage, then tag destruction reliability is improved, but the circuit board becomes more vulnerable to accidental damage from mechanical shock
Solution Approach 1:
The circuit board has different structural properties in different regions: the rigid portion maintains full strength for normal operation while the frangible portion contains intentional weaknesses (score lines, reduced thickness) specifically at the mounting tabs. This local differentiation allows controlled breakage at predetermined locations without compromising overall board integrity against accidental shock.
Solution Approach 2:
The circuit board is pre-scored with fracture lines and pre-weakened at specific locations during manufacturing. These predetermined weakness locations ensure that when removal force is applied, the board breaks along controlled paths rather than randomly, achieving reliable destruction while minimizing accidental damage from normal handling or vibration.
4Force
If a spring mechanism is used to destroy the RFID tag upon tampering, then destruction force is improved, but the mechanism becomes more complex and requires multiple parts to be assembled
Solution Approach 1:
The complex spring-loaded destruction mechanism is removed entirely from the design. Instead, the invention relies on the inherent mechanical properties of the frangible mounting tabs and predetermined fracture lines in the circuit board to achieve destruction through simple removal forces, eliminating the need for springs, actuators, or multiple assembled components.
Solution Approach 2:
The circuit board's frangible mounting tabs are designed to self-destruct through controlled breakage when removal force is applied. The predetermined fracture lines and weakened structures enable the board to destroy itself automatically upon tampering without requiring external activation mechanisms, springs, or complex control systems.
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 a robust, easy-to-install RFID tag with enhanced environmental sealing and tamper-proofing, resisting accidental actuation and ensuring the RFID tag is irreparably destroyed upon tampering, while maintaining operational reliability.
Implementation Method 1
a trigger having a trigger spring that applies a release force to the trigger
Implementation Method 2
a circuit board comprising at least a frangible portion containing electronic circuitry
Data Source
AI summary
A circuit board anti-tamper mechanism comprises a circuit board having a frangible portion, a trigger having a trigger spring, a trigger arming mechanism actuated by the trigger wherein the trigger arming mechanism is initially non-actuated, a force producing mechanism, a latch providing mechanical communication between the trigger arming mechanism and the force producing mechanism, wherein the latch initially retains the force producing mechanism in a refracted position. Arming pressure applied to the trigger sufficient to overcome the trigger spring force will actuate the trigger arming mechanism, causing the anti-tamper mechanism to be armed. Subsequent tampering with the anti-tamper mechanism results in a decrease of pressure on the trigger below the trigger spring force, thereby causing the trigger arming mechanism to actuate the latch, thereby releasing the force producing mechanism to apply force to the frangible portion of the circuit board, thereby breaking the circuit board.