RFID system with an eddy current trap
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Solution Overview
Problem
Existing RFID systems for processing systems are static and limited in product configuration, requiring extensive modifications to produce different products, as existing devices and processes are non-reconfigurable, necessitating the addition of new components for new tasks.
Innovation Solution
An RFID antenna assembly configured with a loop antenna, capacitive components, and an eddy current trap, which allows for the detection of specific RFID tags and enables RFID-based actuation, while using a magnetic field focusing assembly with a split ring resonator to enhance detection precision and prevent interference from adjacent tags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a loop antenna assembly is used for RFID detection, then detection capability is improved, but interference from adjacent tags and far field performance issues worsen
Solution Approach 1:
The patent extracts and removes the harmful far field radiation component by introducing an eddy current trap that specifically targets and eliminates the far field magnetic component while preserving the near field magnetic coupling necessary for RFID operation. This separation allows the system to maintain detection precision while eliminating interference.
Solution Approach 2:
The patent applies different properties to different spatial regions by creating a localized near field detection zone with strong magnetic coupling for precise tag identification, while simultaneously suppressing the far field radiation that causes interference. The eddy current trap is positioned to affect only the far field region without compromising near field performance.
2Productivity
If processing systems are designed for specific products, then production efficiency is improved, but adaptability to different products worsens
Solution Approach 1:
The patent implements a universal RFID detection system that can identify and differentiate various product types through unique tag signatures. The system uses the eddy current trap to isolate and analyze specific magnetic field characteristics that identify different products, allowing a single processing line to handle multiple product configurations without extensive reconfiguration.
Solution Approach 2:
The patent incorporates feedback mechanisms where the RFID detection system continuously monitors tag responses and provides real-time identification of product types. This feedback enables the processing system to automatically adjust parameters and maintain optimal production efficiency across different product configurations without manual reconfiguration.
3Area of stationary object
If multiple RFID tags are detected in adjacent slots, then detection coverage is improved, but detection precision for specific tags worsens
Solution Approach 1:
The patent extracts the interfering magnetic field components from adjacent tags by using the eddy current trap to cancel out far field radiation. This allows the system to maintain wide detection coverage while isolating and precisely identifying the specific tag of interest by removing contributions from neighboring tags.
Solution Approach 2:
The patent introduces the eddy current trap as an intermediary element that mediates between the loop antenna and the RFID tags. This intermediary selectively affects the magnetic field propagation, allowing signals from multiple tags to be received while filtering out interference and enhancing the ability to identify specific tags within the coverage area.
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
Enables efficient and precise detection of RFID tags, allowing for flexible product configuration without extensive modifications, improving the processing system's ability to handle various products by reducing far field performance and enhancing near field performance for accurate tag identification.
Implementation Method 1
an eddy current trap positioned a predetermined distance from the loop antenna assembly
Implementation Method 2
an inductive component including a loop antenna assembly
Implementation Method 3
at least one capacitive component coupled to the inductive component
Data Source
AI summary
An RFID antenna assembly configured to be energized with a carrier signal is disclosed. The RFID antenna assembly includes an inductive component including a loop antenna assembly, at least one capacitive component coupled to the inductive component, and an eddy current trap positioned a predetermined distance from the loop antenna assembly.