RFID Transponder Spatial Structure with Plastic Carrier
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Solution Overview
Problem
Existing RFID transponders face challenges in producing three-dimensional structures with high data transmission quality and low scrap rates, while maintaining desired mass and mass distribution, especially when using metal components that interfere with energy transfer during production.
Innovation Solution
A three-dimensional structure with a metal wire coil wound in adjacent windings, a chip connected to the coil, and a circular spacer element as a carrier, where the coil is wound around the edge, allowing for a predetermined resonance frequency and chip protection during injection molding, using high-density plastics to maintain energy transfer efficiency and improve handling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If metal wire is used for the coil, then the antenna structure is stable and resonant frequency can be set, but metal affects energy transfer between RFID transponder and reading/writing station
Solution Approach 1:
The patent introduces a non-metallic carrier (plastic or ceramic) as an intermediary between the metal coil and the RFID transponder chip. This carrier holds the metal wire coil in a fixed geometric arrangement while electrically isolating it from the chip, thereby maintaining antenna structure stability without interfering with electromagnetic energy transfer.
2Ease of manufacture
If chip is exposed during injection molding, then manufacturing process is simple, but chip experiences high temperature and gets damaged
Solution Approach 1:
The patent employs a nested structure where the chip is placed inside a cavity or recess within the carrier body. This recess protects the chip from direct exposure to high temperatures during injection molding while still allowing the carrier to be manufactured as a single integrated piece through the molding process.
3Ease of manufacture
If coil windings are not fixed, then manufacturing is easier, but antenna deformation occurs during injection molding affecting resonant frequency
Solution Approach 1:
The patent implements preliminary fixation of the coil windings to the carrier before the injection molding process. The carrier includes integrated features such as recesses, grooves, or adhesive areas that secure the coil in its precise geometric arrangement prior to molding, preventing any deformation during the high-temperature processing.
4Device complexity
If three-dimensional structure is created without carrier, then device complexity is reduced, but mass distribution and rolling properties are compromised
Solution Approach 1:
The patent designs the carrier to perform multiple functions simultaneously: it serves as the structural base for mounting the coil, provides electrical isolation between metal components, protects the chip during manufacturing, and contributes to the desired mass distribution and rolling properties of the final coin-like RFID transponder.
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 enables high-security RFID transponders with improved data transmission quality and reduced scrap rates, maintaining resonance frequency and energy transfer efficiency, while protecting the chip and stabilizing the antenna, resulting in enhanced rolling properties and mechanical handling.
Implementation Method 1
An RFID transponder with a chip and a coil as an antenna enables contactless access to a memory containing the chip
Implementation Method 2
A predetermined resonance frequency can be set by the diameter of the rigid spacer element
Data Source
Figure 1a~3b
Figure 4a~4b
AI summary
The structure has a radio frequency identification device transponder with a frame-like molded part (5) for accommodating a spacing element to support a coil at an edge of the element on an interior side of the part. The molded part comprises an associated space with a distance element (6), which is extended into a recess of the spacing element. The spacing element is allowed to overflow into the molded part, and a material is attached to a side turned towards the recess. The material, a part of the molded part and/or a material of the spacing element comprise plastic with high thickness. An independent claim is also included for a method for producing a coil-like spatial structure with a radio frequency identification device transponder.