RFID Vial Lid Inlay With Slotted-Loop Antenna for Metal Clearance
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Solution Overview
Problem
Existing RFID technologies face challenges in tracking small containers like vials without obscuring existing content labels and experiencing signal interference from metallic components, particularly due to the inefficiency of small dipole antennas and coil-type antennas on vial lids.
Innovation Solution
A RFID label with a slotted-loop antenna and chip positioned on the inside surface of the vial lid or with a spacer element to avoid metal interference, ensuring an acceptable read range and non-obstruction of content labels, using a substrate with a non-conductive material and a slotted-loop antenna design that generates a top-side field for improved readability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flag type RFID label wraps around the vial body, then RFID tracking is enabled, but the RFID inlay covers or obscures information printed on the vial and causes reduced or no-reads due to position or angle
Solution Approach 1:
The patent transitions the RFID label placement from the lateral dimension (wrapping around the vial body) to the vertical dimension (attached to the top surface of the vial lid). This dimensional change allows the RFID inlay to be positioned above the printed content labels rather than overlapping them, eliminating the information obscuration problem while maintaining RFID tracking functionality.
2Reliability
If a very small dipole antenna is used on the vial lid, then RFID tracking is enabled on the lid, but the antenna efficiency becomes extremely low
Solution Approach 1:
The patent changes the antenna type from a dipole antenna to a loop antenna configuration. This parameter change in antenna geometry allows for better performance on the small circular lid surface, improving energy efficiency and RFID signal strength while maintaining the compact form factor required for vial lid application.
3Reliability
If a coil type antenna is used on the circular lid, then the antenna can be positioned on the lid surface, but the circular shape leads to null in the signal when read from the top
Solution Approach 1:
The patent employs an asymmetric loop antenna design with a gap in the loop structure, positioned such that the gap is not radially aligned with the read head. This asymmetric configuration eliminates the null signal problem that occurs with symmetric circular coil antennas when read from the top, ensuring consistent signal strength in all read directions.
4Ease of manufacture
If the RFID antenna is placed close to metal components, then the RFID label can be attached to the vial lid, but signal interference from metal prevents proper reading or writing of data
Solution Approach 1:
The patent introduces a non-conductive substrate material as an intermediary layer between the RFID antenna and the metal components of the vial lid. This mediator provides electrical isolation that prevents signal interference and degradation caused by proximity to metal, while still allowing the RFID label to be securely attached to the lid surface.
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 efficient RFID tracking of vials with increased read range and reduced signal interference, allowing for accurate data retrieval without covering content labels and maintaining readability even when attached to metal components.
Implementation Method 1
A RFID label with a slotted-loop antenna and chip positioned on the inside surface of the vial lid or with a spacer element to avoid metal interference, ensuring an acceptable read range and non-obstruction of content labels
Implementation Method 2
The stored information is retrievable with a RFID reader which interrogates the RFID device electromagnetically
Data Source
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AI summary
A RFID label for use on a lid of a container, and a method of using the RFID label. The RFID label comprises a substrate component, a RFID antenna formed on the substrate component, and a RFID chip for storing data coupled to the RFID antenna. The RFID label is positioned or configured on the lid so as to limit or avoid any interference between the RFID antenna and the RFI D chip by any metal component of the container. The RFID label is particularly useful for conta iners that have small lids or metal components, such as vials, where conventional RFID usage is limited.