Capacitive Coupling RFID Tag for Beverage Containers
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Solution Overview
Problem
Beverage containers with RFID tags require complex reader antennas, which are cumbersome and costly, and existing RFID tags for fast-moving consumer goods (FMCGs) are large and expensive due to the need for loop antennas and special transponders.
Innovation Solution
A portable object with integrated circuits and pads that use capacitive coupling for data and energy transfer, eliminating the need for loop antennas and complex reader systems, allowing for a smaller, more cost-effective RFID tag design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If loop antennas and complex reader antennas are used for RFID tags in beverage containers, then data transfer capability is achieved, but the size and cost of the electronic components increase significantly
Solution Approach 1:
The patent extracts and eliminates the loop antenna structure from the RFID tag design. Instead of using traditional magnetic coupling through loop antennas, the invention uses direct capacitive coupling between the tag's pads and the reader's conducting lines, removing the need for complex antenna structures while maintaining data transfer capability
Solution Approach 2:
The patent replaces the electromagnetic induction mechanism (mechanical/electromagnetic field coupling through antennas) with direct electrical capacitive coupling through contact pads. This substitution simplifies the system by eliminating the need for resonant antenna structures and complex reader antennas, reducing both size and complexity
2Adaptability or versatility
If loop antennas are used in RFID tags for FMCGs, then wireless communication is enabled, but the tag size and manufacturing cost increase
Solution Approach 1:
The patent removes the loop antenna component entirely from the tag design. The wireless communication capability is achieved through capacitive coupling between small contact pads on the tag and conducting lines in the reader, enabling communication without the space-consuming antenna structure
Solution Approach 2:
The patent changes the coupling mechanism from electromagnetic resonance (requiring large antenna areas) to direct capacitive coupling (requiring only small pad areas). This parameter change in the communication mechanism allows significant reduction in tag size while maintaining functionality
3Reliability
If complex reader antennas are used to read RFID tags, then reading distance and reliability are improved, but the reader system becomes more expensive and cumbersome
Solution Approach 1:
The patent eliminates the need for complex reader antennas by using direct capacitive coupling. The reader system only requires simple conducting lines that make contact with or come close to the tag pads, removing the need for resonant antenna structures and associated complexity
Solution Approach 2:
The patent introduces capacitive coupling as an intermediary mechanism between the reader and tag. This capacitive interface allows reliable signal transfer without requiring complex electromagnetic field coupling through large antennas, simplifying both reader and tag designs
4Reliability
If traditional RFID tags with loop antennas are used in portable objects, then identification function is achieved, but the weight and size prevent easy portability
Solution Approach 1:
The patent removes the heavy loop antenna structure from the portable object. The identification function is maintained through capacitive coupling between small, lightweight pads on the portable object and conducting lines in the reader, enabling portability without sacrificing functionality
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 reduces the size and cost of RFID tags by enabling data and energy transfer through capacitive coupling, allowing for efficient RFID authentication and identification of FMCGs without the need for complex reader antennas, resulting in a 60% or more reduction in tag size and significant cost savings.
Implementation Method 1
designed for data transfer by capacitive coupling of the first pad to a first conducting line and of the second pad to a second conducting line
Data Source
AI summary
A portable object (10) comprises an integrated circuit (11), a first pad (12) that is mechanically and electrically connected to the integrated circuit (11) and a second pad (13) that is mechanically and electrically connected to the integrated circuit (11). The portable object (10) is designed for data transfer by capacitive coupling of the first pad (12) to a first conducting line (33) and of the second pad (13) to a second conducting line (34), when the portable object (10) is brought in vicinity to the first and the second conducting line (33, 34).