RFID Label with Magnetic Layers for Metal Surface Decoupling
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Solution Overview
Problem
RFID transponder labels face challenges when applied to surfaces that affect electromagnetic waves, particularly metallic surfaces, as existing solutions require additional layers for decoupling, increasing the overall height and limiting application, while existing solutions like ferrite shielding require thicker layers for effective permeability.
Innovation Solution
A combination of a ferromagnetic layer and a diamagnetic layer with different magnetic properties is used between the RFID transponder and the surface, ensuring electromagnetic decoupling with a maximum combined thickness of 0.3 mm, allowing the RFID transponder label to be applied to various surfaces without height increase and maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional intermediate layer is introduced between the RFID transponder and the surface to prevent direct contact and improve functionality on metallic surfaces, then the transponder's ability to operate on electromagnetic-affecting surfaces is improved, but the overall height of the RFID transponder label increases considerably
Solution Approach 1:
The patent changes the magnetic properties of the intermediate layer by using materials with specific permeability values (μ ≥ 10, preferably μ ≥ 100), transforming a standard insulating layer into a magnetically active layer that provides both electrical insulation and magnetic field management, thereby resolving the contradiction between functionality and thickness
Solution Approach 2:
The patent employs composite material structures combining electrically insulating properties with high magnetic permeability in the intermediate layer, creating a multi-functional material that simultaneously provides electrical isolation and magnetic field coupling enhancement, allowing thin-layer design while maintaining transponder functionality on metallic surfaces
2Reliability
If a ferromagnetic layer is used instead of an insulating layer to improve transponder functionality on metallic surfaces, then electromagnetic decoupling is improved, but the overall height of the RFID transponder label still increases
Solution Approach 1:
The patent optimizes the magnetic permeability parameter of the intermediate layer to values of μ ≥ 10 (preferably μ ≥ 100), enabling the layer to provide effective magnetic field management at reduced thickness, thereby improving decoupling effectiveness without proportionally increasing height
3Object-affected harmful factors
If ferrite shielding is introduced between the coil and metal surface to avoid eddy currents, then the occurrence of eddy currents is largely avoided and antenna mounting on metal surfaces becomes possible, but the thickness and overall height of the label structure increases
Solution Approach 1:
The patent changes the permeability parameter of the intermediate layer to high values (μ ≥ 10, preferably μ ≥ 100), which fundamentally alters the magnetic field distribution and suppresses eddy current formation in underlying metallic surfaces, achieving harmful factor reduction at minimal thickness
Solution Approach 2:
The patent introduces an intermediate layer with specific magnetic properties as a mediator between the transponder antenna and the metallic surface, which manages the magnetic field interaction and prevents direct harmful coupling, thereby eliminating eddy currents while maintaining a thin overall structure
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
This configuration effectively reduces eddy currents and enhances data communication by bundling and scattering electromagnetic waves, ensuring the RFID transponder's functionality is not affected by different surface materials while maintaining a low overall height.
Implementation Method 1
the data communication between an RFID transponder label and the read/write devices with a coupled RFID transponder antenna takes place by means of electromagnetic waves, the propagation of which is influenced and disrupted by various materials, in particular metallic materials
Implementation Method 2
the data communication between an RFID transponder label and the read/write devices with a coupled RFID transponder antenna takes place by means of electromagnetic waves
Implementation Method 3
a first layer with a first magnetically active material adjacent to the carrier substrate and a second layer with a second magnetically active material that is further away from the carrier substrate than the first layer and the first magnetically active material and the second magnetically active material have different magnetic properties
Data Source
AI summary
The invention relates to an RFID transponder label comprising a carrier substrate, an RFID transponder antenna arranged on the carrier substrate, an RFID transponder chip connected to the RFID transponder antenna, and at least two additional layers, wherein the additional layer structure comprises a first layer having a first magnetically active material and a second layer having a second magnetically active material and the first magnetically active material and the second magnetically active material have different magnetic properties.