Universal RFID Tag Decoupling Near Field and Far Field Antennas
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Solution Overview
Problem
Current RFID tags face challenges in achieving reliable read rates due to radio wave attenuation caused by product and packaging dielectric properties, leading to impedance mismatch issues, which complicates design and inventory management, especially in supply chain applications where universal tags are needed but specific tags are often required for each product.
Innovation Solution
The design decouples near field and far field RFID tag components, allowing a pre-manufactured near field only RFID tag to be used with a separately tuned conductive element as a far field antenna, enabling functionality in both near and far field ranges without the need for integrated tags, thus simplifying design and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If integrated RFID tags with both near field and far field antennas are designed, then far field functionality is achieved, but device complexity and manufacturing difficulty increase due to impedance matching requirements
Solution Approach 1:
The RFID system is divided into two independent components: a pre-manufactured near field tag and a separately applied far field antenna. This segmentation allows each component to be optimized independently, with the near field tag being mass-produced using standard processes and the far field antenna being customized for specific packaging materials and products, thereby reducing overall system complexity while maintaining both near field and far field functionality.
2Reliability
If product-specific RFID tags are designed for each SKU, then read reliability is improved, but inventory complexity and manufacturing costs increase
Solution Approach 1:
A universal near field tag design is implemented that can be used across all SKUs, eliminating the need for product-specific tag variations. The tag's performance is optimized through the separate application of far field antennas that are tuned to work with different packaging materials, allowing the same near field tag to achieve reliable read rates across diverse products without increasing inventory complexity.
3Adaptability or versatility
If RFID tags are applied to products with varying dielectric properties, then product identification capability is maintained, but read reliability deteriorates due to radio wave attenuation
Solution Approach 1:
The far field antenna is customized for each specific packaging material and product combination, creating local optimization at the application point. This allows the antenna's electrical characteristics to be matched to the specific dielectric properties of each packaging type (e.g., corrugated cardboard, plastic, metal), ensuring optimal read reliability for each local application while maintaining a universal near field tag design.
4Ease of manufacture
If pre-manufactured near field tags are used with separately applied far field antennas, then manufacturing flexibility is improved, but device complexity increases due to coupling requirements
Solution Approach 1:
The far field antenna function is extracted from the pre-manufactured near field tag and implemented as a separate component applied to the packaging. This extraction allows the near field tag to be mass-produced in a controlled environment with consistent performance, while the far field antenna can be independently optimized and applied during packaging operations, simplifying the overall manufacturing process despite the additional coupling step.
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 approach allows for cost-effective, scalable RFID tagging solutions with improved read rates and reduced inventory complexity, as the same near field only RFID tag can be used across various products, with the far field antenna tuned specifically for each item, enhancing operational efficiency in supply chain management.
Implementation Method 1
a conductive element independent from the near field only RFID tag and adapted to function as a far field antenna
Implementation Method 2
the near field only RFID tag is coupled in proximity to the conductive element such that the RFID device functions in both a near field and a far field
Data Source
AI summary
Radio frequency identification (RFID) devices, and methods of manufacture are described herein. In one implementation, a RFID device comprises: a near field only RFID tag that does not function as a far field RFID tag and is pre-manufactured; and a conductive element independent from the near field only RFID tag and adapted to function as a far field antenna. The near field only RFID tag is coupled to a first portion of an item; and the conductive element is coupled to a second portion of the item, the first portion and the second portion located such that the near field only RFID tag is coupled in proximity to the conductive element such that the RFID device functions in both a near field and a far field.