RFID Security Tag Void Structure Antenna Tampering Detection
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Solution Overview
Problem
RFID transponder bands used in logistics, such as luggage tags, can unintentionally detach from one item and attach to another, making it difficult to detect tampering and ensuring secure identification.
Innovation Solution
The RFID transponder arrangement features a dipole antenna with a void structure and specific adhesive forces between layers, which upon detachment, creates a visual void effect and disrupts the antenna's functionality, making it harder to read the transponder, and includes multiple semiconductor chips coupled via loop antennas or matching networks to detect manipulation attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the RFID transponder band is made simple and easy to attach, then ease of operation is improved, but security and detectability of tampering deteriorate
Solution Approach 1:
The band is divided into multiple functional layers (substrate layer, adhesive layer, top layer, void structure) with specific adhesive force relationships. The void structure creates intentional separation zones that reveal tampering when the band is detached and reattached, allowing simple attachment while detecting security violations.
Solution Approach 2:
The void structure creates visual changes (void effect) that are visible when the band is tampered with. The difference in adhesive forces causes parts of the top layer and antenna to separate from the substrate layer, creating visible voids that indicate tampering without complicating the attachment process.
2Reliability
If the adhesive force between layers is strong, then reliability is improved, but ability to detect tampering through void effect deteriorates
Solution Approach 1:
Different regions of the band have different adhesive forces. The void structure elements have lower adhesive force to the substrate layer compared to the adhesive layer, creating localized separation zones. This local quality difference allows the band to remain securely attached while revealing tampering at specific locations through void effects.
Solution Approach 2:
The void structure is pre-formed during manufacturing with specific adhesive force characteristics. When the band is properly attached, the void structure remains intact. If tampering occurs, the predetermined adhesive force differences cause immediate visual separation, allowing detection without requiring additional testing.
3Ease of manufacture
If the antenna structure is simple, then ease of manufacture is improved, but reading range and functionality deteriorate
Solution Approach 1:
The antenna is integrated with the void structure and top layer as a unified assembly. The dipole antenna is positioned to contact the top layer while the void structure elements are spaced apart to maintain electrical continuity. This merging allows the antenna to function as a complete RFID transponder while the void structure provides tampering detection capability.
Solution Approach 2:
The void structure adds a spatial dimension to the antenna assembly, creating spaced-apart elements that maintain electrical connectivity while providing physical separation for tampering detection. This dimensional arrangement allows the antenna to achieve proper reading range without compromising the void effect visibility.
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 tamper-proof mechanism where detachment attempts result in reduced or lost reading range, making it easier to detect manipulation and ensuring reliable reading of intact tags while preventing unauthorized data access.
Implementation Method 1
The RFID transponder can include another semiconductor chip that is coupled to the dipole antenna via another loop antenna
Implementation Method 2
The adhesive force between one of the elements of the void structure and the substrate layer is lower than the adhesive force between the dipole antenna and the adhesive
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a security tag comprising a substrate layer (10), a void structure (20) applied to the substrate layer and an RFID transponder. The RFID transponder comprises at least one semiconductor chip (43) and a dipole antenna (30) which is applied above the void structure (20). According to the invention, upon triggering the void effect, the dipole antenna (30) is interrupted, which can be determined by a reduced reading range of the transponder. A manipulation attempt on the security tag can thus be determined.