Chipless RFID Tag With Low-Permittivity Dielectric Layer
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Solution Overview
Problem
Chipless RFID tags face challenges with low directivity and signal strength, particularly when miniaturized, making long-distance reading inefficient for applications like commodity distribution and manufacturing steps.
Innovation Solution
A contactlessly readable tag design incorporating a metal pattern layer, a conductive layer, and an intermediate layer with a relative permittivity of 0 to 2.5, where the metal pattern layer is closer to the reading surface, and the intermediate layer can be made of porous materials or metal dispersion dielectrics, enhancing signal strength and directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the tag size is miniaturized, then the portability and applicability are improved, but the signal strength and reading distance deteriorate
Solution Approach 1:
A dielectric layer with specific permittivity (2.5 or less) is introduced as an intermediary between the metal pattern layer and the substrate. This dielectric layer acts as a mediator that enhances the resonance characteristics and signal strength of the miniaturized tag, allowing long-distance reading capability to be maintained even when the tag size is reduced to 4cm or less.
Solution Approach 2:
The patent changes the permittivity parameter of the dielectric layer to 2.5 or less, which fundamentally alters the electromagnetic resonance characteristics of the tag. This parameter change enables the miniaturized tag to maintain strong signal strength and achieve reading distances of 1 meter or more, resolving the contradiction between size reduction and signal maintenance.
2Reliability
If conventional RFID tags with IC chips are used, then the identification functionality is achieved, but the vulnerability to static electricity and vibration increases
Solution Approach 1:
The patent extracts and removes the IC chip component from the RFID tag system, replacing it with a chipless RFID structure using only metal patterns on a substrate. This extraction eliminates the vulnerable IC chip while maintaining the identification functionality through electromagnetic resonance, thereby removing the tag's susceptibility to static electricity and vibration damage.
Solution Approach 2:
The patent employs a simple metal pattern structure without expensive or fragile IC chips, creating a more durable and environmentally resistant tag. The chipless design uses robust metal patterns that can withstand harsh conditions including static electricity and vibration, making the tag suitable for demanding industrial and distribution environments.
3Ease of manufacture
If barcode tags are used, then the cost is reduced, but the reading distance and operator burden increase
Solution Approach 1:
The patent merges the advantages of barcode tags (low cost, simple manufacturing) with the advantages of RFID tags (contactless reading, long distance). The chipless RFID tag uses simple metal patterns that can be manufactured like barcodes but provides RFID functionality with reading distances of several meters, eliminating the need for close proximity reading and reducing operator burden while maintaining low cost.
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 allows for both miniaturization of the tag size and improved long-distance readability, reducing errors and ensuring accurate identification information retrieval.
Implementation Method 1
at least one intermediate layer that has a relative permittivity of 0 or more and 2.5 or less and that is provided between the metal pattern layer and the conductive layer
Implementation Method 2
the identification information is configured to be identified based on information on an electromagnetic wave that is reflected by the contactlessly readable tag
Implementation Method 3
the intermediate layer includes at least one of a porous material, a non-woven fabric, and a metal dispersion dielectric
Implementation Method 4
has low efficiency of the resonance phenomenon caused by the metal pattern
Data Source
AI summary
A contactlessly readable tag includes a metal pattern layer, a conductive layer, and at least one intermediate layer. The intermediate layer has a relative permittivity of 0 or more and 2.5 or less and is provided between the metal pattern layer and the conductive layer. The metal pattern layer includes a metal part whose arrangement pattern corresponds to identification information. The identification information is configured to be identified based on information on an electromagnetic wave that is reflected by the contactlessly readable tag in response to irradiation of the contactlessly readable tag with an electromagnetic wave. The metal pattern layer is provided closer to a reading surface of the contactlessly readable tag than at least one of the intermediate layer.