RFID Tag Disable Mechanism Using Movable Metallic Shield
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Solution Overview
Problem
Conventional methods for temporarily disabling RFID tags, especially those permanently mounted on vehicles, are inadequate as they require removal and can be damaged, or are not suitable for reuse, and do not allow for user-controlled temporary disabling without damaging the tag.
Innovation Solution
A system and method for selectively enabling and disabling RFID transponders using a movable metallic disabling member that alters the antenna's impedance or electric field, allowing the tag to be disabled and re-enabled without removal or damage, using a device that can be securely attached to the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID tags are permanently mounted on vehicles using adhesive or encapsulation, then tag security and fraud prevention are improved, but the ability to temporarily disable the tag without removal or damage is lost
Solution Approach 1:
The disabling function is segmented from the main tag body as a separate removable component (metallic shield or disabling member) that can be independently attached or detached, allowing temporary disabling without affecting the permanently mounted tag itself
Solution Approach 2:
A metallic shield or disabling member acts as an intermediary component between the user and the tag, providing the disabling function without requiring direct modification or removal of the permanently mounted tag
2Reliability
If conventional disabling methods use removal and placement in metallized bags, then tag disabling is achieved, but ease of operation deteriorates due to removal requirements and risk of tag damage
Solution Approach 1:
The metallic shield is pre-configured with attachment means (adhesive, clips, or mechanical connectors) that enable direct attachment to the tag or vehicle, eliminating the need for removal and bagging steps
Solution Approach 2:
The disabling device is designed to be self-contained with integrated attachment mechanisms, allowing users to disable the tag themselves without requiring removal tools or separate shielding bags
3Reliability
If RFID tags are permanently fixed to windshields, then fraud prevention is improved, but the ability to temporarily disable for HOV/HOT lane compliance is worsened
Solution Approach 1:
The system transitions from a static permanently-mounted tag to a dynamic configuration where a removable disabling member can be attached or detached based on whether HOV lane compliance is needed, enabling adaptive behavior
Solution Approach 2:
The disabling function is applied locally through a metallic shield or disabling member that covers only the tag area when attached, leaving the rest of the permanently mounted tag system intact and secure
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
Enables user-controlled temporary disabling of RFID tags, allowing for compliance with toll regulations and other applications without damaging the tag, while maintaining security and ease of use, and allowing the tag to be reused.
Implementation Method 1
coupled to the antenna in such a manner as to disable the RFID circuitry when the disabling member is in the operative position (e.g., to alter the impedance of said antenna to shift its resonance frequency when said disabling member is in the operative position or to reduce the electric field at the antenna when the disabling member is in the operative position)
Implementation Method 2
The placement of the tag within that bag will prevent the RFID tag from being read or written to by an interrogating system by shielding the tag from RF energy that the interrogator transmits. In particular, the bag or pouch reflects most or all of this energy, thereby cutting off communication between the tag and the reader.
Data Source
AI summary
Systems, tags and methods for disabling transponders used in electronic toll collection or other RFID systems, wherein the transponders include an antenna and RFID circuitry. The transponders can be selectively disabled by positioning (e.g., pivotably moving) a disabling member having a metallic portion to an operative position over the antenna of the RFID system, whereupon the metallic portion is coupled to the antenna in such a manner as to disable the RFID circuitry so long as the disabling member is at the operative position. The RFID circuitry is arranged to be automatically enabled upon removal of the disabling member from the operative position (e.g., pivoting the disabling member back to an inoperative position).