RFID Interrogator Antenna Shifting for 3D Tag Detection
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Solution Overview
Problem
Existing RFID systems, particularly those using flat planar antenna coils, are unsuitable for applications where RFID transponders are stacked or stored on shelves due to limited three-dimensional interrogation capabilities and high implementation costs, leading to missed identifications when item orientation is not aligned with the interrogation field.
Innovation Solution
A method and apparatus that shift a single or smaller antenna array within a larger area to create a 'virtual' array capable of 1, 2, or 3-dimensional interrogation, reducing the need for complex and costly MUX circuits and sequentially switched coils, allowing for efficient RFID reading across a larger area without the limitations of physical array size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If flat planar antenna coils are used for RFID interrogation, then the device complexity is reduced, but the three-dimensional interrogation capability is lost and items cannot be reliably identified when orientation is not aligned
Solution Approach 1:
The patent transitions from two-dimensional planar antenna coils to three-dimensional spatial arrangement by positioning multiple planar coils at different orientations (e.g., stacked at 0°, 60°, 120° angles). This dimensional enhancement enables 360-degree omnidirectional interrogation capability while retaining the simplicity of planar coil structures, solving the contradiction between structural simplicity and spatial versatility.
Solution Approach 2:
The patent divides a single large-scale complex antenna into multiple smaller planar coil segments arranged in space. Each segment operates independently at specific orientations, collectively providing comprehensive 3D coverage. This segmentation reduces individual component complexity while achieving system-level versatility through spatial distribution.
2Adaptability or versatility
If multiple interrogator coils operating in different coordinate axes are used to achieve three dimensional operation, then the three dimensional interrogation capability is improved, but the device complexity and implementation cost increase
Solution Approach 1:
The patent merges multiple planar coil structures into a unified omnidirectional antenna assembly where coils are positioned at specific angular intervals (e.g., 0°, 60°, 120°). This consolidation achieves 3D interrogation capability through coordinated operation of integrated components rather than separate complex systems, reducing overall device complexity while maintaining versatility.
Solution Approach 2:
The patent designs the antenna system with universal omnidirectional coverage capability that can interrogate RFID tags from any orientation. The same antenna structure serves multiple functions: it provides 360-degree horizontal coverage, vertical stacking capability, and adapts to various application scenarios (shelving, conveyor systems, storage units), eliminating the need for multiple specialized antenna configurations.
3Area of stationary object
If a large physical antenna array is deployed to cover a large area, then the reading area is increased, but the device complexity and cost increase
Solution Approach 1:
The patent extends coverage area by adding vertical dimension through stacked omnidirectional antennas at different heights and angles, rather than expanding horizontal footprint. This 3D spatial utilization achieves large effective reading volume with compact physical footprint, covering entire storage units or shelving systems without requiring large floor space or complex large-scale arrays.
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 effective RFID identification on plane surfaces like shelves with reduced costs and complexity, providing a large reading area with 1, 2, or 3-dimensional capabilities, ensuring accurate identification of RFID tags regardless of orientation, and reducing emissions and interference.
Implementation Method 1
an antenna, when activated, being adapted to radiate an interrogation signal in a first area
Data Source
AI summary
The present invention relates to the identification of RFID devices that are arranged closely together and placed on shelving for logistical and storage purposes. Furthermore, the aspects of the present invention relate to an arrangement and/or layout of antenna coils for example in an interrogator. There is disclosed a RFID interrogator and/or method of interrogating comprising an antenna, when activated, being adapted to radiate an interrogation signal in a first area, means adapted to shift the antenna within a second area, the second area being larger than the first area. The antenna may be mechanically moveable.