RFID Tag Metal Secondary Antenna Read Range
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Solution Overview
Problem
Magnetic RFID tags face limitations in applications involving metal objects due to radio-frequency interference and challenges in integration, leading to reduced read ranges and increased costs with the use of secondary antennas.
Innovation Solution
Utilizing the metal or conductive parts of the object as a secondary antenna, electromagnetically coupled to the primary antenna without an electrical connection, to enhance the read range and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic RFID tag is used on metal objects, then identification functionality is provided, but radio-frequency interference occurs and read range is reduced
Solution Approach 1:
The patent converts the harmful metal object into a beneficial secondary antenna. The metal conductive elements of the object (such as shoe heels, spectacle frames, or metal plates) are utilized as passive antennas that resonate at the RFID frequency, transforming the previously harmful RF interference into a useful signal amplification mechanism that extends read range.
Solution Approach 2:
The patent makes the metal object serve dual functions: its original mechanical function and an additional antenna function. The same metal components (shoe heels, spectacle arms, cart frames) that provide structural support now also serve as resonant antennas, eliminating the need for separate antenna structures and reducing overall device complexity.
2Length of stationary object
If a secondary antenna is added to increase read range, then read range is improved, but manufacturing cost increases
Solution Approach 1:
The patent enables the object itself to provide the antenna function through its existing metal components. The object's own conductive elements serve as the secondary antenna, eliminating the need for manufacturers to add separate antenna components. This self-service approach reduces bill of materials costs and simplifies the manufacturing process while achieving extended read range.
Solution Approach 2:
The patent extracts the antenna function from a separate component and embeds it within the object's existing structure. Instead of adding an external secondary antenna, the solution extracts and utilizes the object's inherent metal conductive elements as the antenna, reducing component count and manufacturing complexity.
3Reliability
If an RFID tag is integrated into metal objects, then identification is enabled, but structural characteristics reduce read range
Solution Approach 1:
The patent introduces the object's metal structure as an intermediary between the RFID tag and the external reader. The metal components act as a resonant mediator that couples the tag's electromagnetic field with external signals, amplifying the interaction and extending read range despite the presence of metal interference.
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 effectively increases the read range of RFID tags in metal-rich environments while maintaining the mechanical characteristics of the object and reducing manufacturing costs, by leveraging the object's conductive elements as integral secondary antennas.
Implementation Method 1
at least one electrical and/or magnetic so-called primary antenna used to supply signals to said at least one electronic chip
Implementation Method 2
said secondary antenna being coupled to said primary antenna without an electrical connection
Data Source
AI summary
A radio-frequency identification device of the non-contact type, suitable for fixing to an object to be identified that includes a module with at least one electronic chip and at least one electrical and/or magnetic so-called primary antenna used to supply signals to the at least one electronic chip, and an electrical and/or magnetic so-called secondary antenna. The secondary antenna is a conductive element that forms part of the object or is produced by modifying a constituent of the object, the secondary antenna being coupled to the primary antenna without an electrical connection.