Periodic Guided-Wave RFID Tag Distance Detection
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Solution Overview
Problem
Traditional RFID systems face challenges in recognizing multiple RFID tags of varying positions and orientations due to the variability of magnetic field strengths produced by near-field antennas, which limits their ability to accurately determine the distance of tags from the reader.
Innovation Solution
A recognition system incorporating a periodic guided-wave structure with conductive units arranged on a plane, combined with a near-field sensing device featuring a near-field antenna, which confines the electromagnetic field to facilitate the detection and distance determination of multiple units under test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional near field antenna is used to recognize multiple RFID tags, then the system can cover a pre-defined reorganization area, but the magnetic field strength varies making it difficult to accurately determine the distance of tags from the reader
Solution Approach 1:
A periodic guided-wave structure is introduced as an intermediary between the near field antenna and the RFID tags. This structure confines and guides the electromagnetic field, creating a controlled environment that enables accurate distance determination while maintaining the ability to recognize multiple tags across a reorganization area.
Solution Approach 2:
The periodic guided-wave structure modifies the electromagnetic field parameters by confining and directing the field distribution. This changes the field strength characteristics from variable and unpredictable to controlled and measurable, enabling accurate distance determination through consistent field-tag interaction patterns.
2Adaptability or versatility
If the near field antenna produces vertical and horizontal polarized magnetic fields, then all RFID tags in different positions and directions can be recognized, but the varying magnetic field strength complicates distance measurement
Solution Approach 1:
The periodic guided-wave structure serves as a mediator that works with both vertically and horizontally polarized magnetic fields. It confines these fields in a controlled manner, allowing the system to maintain versatility in recognizing tags at different positions and orientations while enabling accurate distance measurement through the structured field confinement.
3Measurement precision
If no electromagnetic field confinement is used, then the system can operate without additional structures, but it cannot accurately determine the distance from tags to the reader
Solution Approach 1:
The periodic guided-wave structure divides and segments the electromagnetic field into controlled regions through its periodic conductive units. This segmentation confines the field in a systematic way, enabling distance determination without requiring complex additional structures, as the periodic pattern itself provides the necessary field control.
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 system effectively senses and distinguishes multiple RFID tags by confining the electromagnetic field, allowing for accurate determination of tag positions and orientations, enhancing recognition capabilities and distance measurement.
Implementation Method 1
The periodic guided-wave structure confines the electromagnetic field for facilitating to determine the distance from any one of the units under test to the periodic guided-wave structure
Implementation Method 2
The near field sensing device has a near field antenna and senses the plurality of units under test through detecting the near field magnetic field
Data Source
AI summary
A recognition system is offered. The recognition system is for sensing a plurality of units under test of at least an object under test. The recognition system comprises a periodic guided-wave structure and a near field sensing device. The periodic guided-wave structure is disposed under the object under test and has a plurality of conductive units periodically arranged on a plane. The near field sensing device has a near field antenna and senses the plurality of units under test through detecting the near field magnetic field. The periodic guided-wave structure confines the electromagnetic field for facilitating to determine the distance from any one of the units under test to the periodic guided-wave structure.