Adaptive Near Field RFID Coupler for Arbitrary Inlay Geometry
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Solution Overview
Problem
Conventional electromagnetic couplers for RFID inlays require calibration or external control to achieve optimal coupling, limiting their adaptability to inlays of arbitrary shapes and making them unsuitable for real-time operation without prior knowledge of the inlay profile.
Innovation Solution
A multi-layer electromagnetic coupler arrangement with a top surface of phase altering elements, including a transmission line network and metallic layers with apertures, provides a constant phase across the surface, enabling efficient coupling regardless of inlay geometry without the need for calibration or external control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid electrical RF circuit is used in a static coupler design, then the circuit structure is simple and stable, but the RF coupling behavior has high variability for different inlay geometries requiring calibration
Solution Approach 1:
The invention uses a flexible array of independently controllable coupling cells instead of a rigid circuit. Each cell can be individually activated or deactivated based on the detected inlay geometry, allowing the coupler to dynamically adapt its configuration to different inlay shapes and positions without requiring physical recalibration.
Solution Approach 2:
The coupler is divided into multiple discrete coupling cells arranged in an array. Each cell can be independently controlled, allowing selective activation of specific cells based on inlay detection results. This segmentation enables flexible adaptation to various inlay geometries while maintaining system stability.
2Adaptability or versatility
If an adaptive coupler with external control is used, then the coupling can be optimized for different inlay types, but the system requires complex scanning processes and software control
Solution Approach 1:
The coupler system performs self-adaptation by detecting inlay presence and automatically activating the appropriate coupling cells without requiring external control software or manual calibration. The system serves itself by using the detected inlay geometry information to directly control its own configuration.
Solution Approach 2:
The system uses feedback from inlay detection (scanning results) to automatically control which coupling cells are activated. The detection information feeds back to the control mechanism, enabling automatic optimization of coupling for the detected inlay type without external intervention.
3Reliability
If calibration is performed for each inlay type in static couplers, then optimal coupling is achieved for known inlay positions, but the process requires prior knowledge of inlay profiles and cannot operate in real-time
Solution Approach 1:
The system performs a quick scanning detection of inlay presence and geometry before activation of the coupling cells. This preliminary detection action provides the necessary information to immediately configure the appropriate cells, enabling real-time adaptation without time-consuming calibration procedures.
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 allows for flexible adaptation to inlays of arbitrary shapes, ensuring efficient electromagnetic power transfer and encoding in RFID inlays, independent of inlay geometry or orientation, and can be integrated into printing devices without requiring complex software or hardware control systems.
Implementation Method 1
an array of phase altering elements (PAE) arranged so as to provide for a constant phase across a top surface of the arrangement
Implementation Method 2
The encoding is performed by means of electromagnetic coupling, preferably in the reactive near field
Data Source
Figure 1~2B
Figure 2A
Figure 3~4
AI summary
An adaptive near field electromagnetic coupler for coupling electromagnetic power to a plane metallic trace (inlay) independently of the inlay geometry and/or orientation without external control algorithms. This is achieved by employing a microstructure of phase altering elements suitable for creating a constant phase field distribution along a top surface of the coupler structure. This is advantageously applicable to printing devices having a function of encoding RFID layers printed on a medium. In view of the provided flexibility, the coupler arrangement can be employed in a variety of printers of different mechanical design.