RFID Infinity Antenna Dual-Plate Read Volume
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Solution Overview
Problem
Conventional RFID antennas with loop formations have limited read areas due to unidirectional magnetic fields, resulting in difficulty in detecting RFID tags across wide areas and requiring multiple antennas for complete coverage, which is costly.
Innovation Solution
The use of two or more electroconductive sheets with evenly spaced supply points and alternating current flow to create a uniform magnetic field in multiple directions, allowing for a larger read volume and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional loop antennas are used, then the structure is simple and cost-effective, but the read area is limited and detection coverage is insufficient
Solution Approach 1:
The patent transitions from a two-dimensional planar loop antenna to a three-dimensional configuration using two parallel electroconductive plates separated by a distance. This dimensional change enables the generation of magnetic fields in multiple directions (X, Y, and Z axes), significantly expanding the read area and detection coverage while maintaining structural simplicity through the use of flat plates rather than complex curved surfaces.
Solution Approach 2:
The patent combines two electroconductive plates to form a unified antenna system that generates multi-directional magnetic fields. By merging the functionality of multiple directional antennas into a single dual-plate structure, the system achieves comprehensive coverage without requiring separate antennas for different directions, thus reducing overall device complexity while expanding read area.
2Area of stationary object
If multiple loop antennas are used to achieve complete coverage, then the detection coverage is improved, but the cost increases
Solution Approach 1:
The patent merges the functionality of multiple directional loop antennas into a single dual-plate structure. The two parallel electroconductive plates work together to generate magnetic fields in all three spatial directions simultaneously, eliminating the need for multiple separate antennas while achieving complete detection coverage. This consolidation reduces both the quantity of components and the associated costs.
Solution Approach 2:
The dual-plate antenna structure serves multiple functions simultaneously: it generates magnetic fields in the X, Y, and Z directions, provides comprehensive detection coverage, and maintains structural simplicity. This multi-functional design replaces what would traditionally require multiple specialized antennas, reducing the quantity of components needed while achieving superior detection coverage.
3Strength
If conventional loop antennas are used, then the magnetic field strength at the center is high, but the magnetic field drops drastically outside the center
Solution Approach 1:
The patent transitions from a two-dimensional planar loop to a three-dimensional dual-plate configuration, which fundamentally changes the magnetic field distribution. The separation of plates in the Z-direction creates overlapping magnetic field patterns that combine to produce a uniform field across a larger volume space, maintaining field strength over an extended area rather than concentrating it at a single center point.
Solution Approach 2:
The patent creates different magnetic field characteristics in different spatial regions. The space between and around the two electroconductive plates experiences a uniformly distributed magnetic field, while the plates themselves generate the field. This local differentiation of field quality ensures that the useful detection area benefits from uniform field strength, solving the problem of rapid field decay outside the center region.
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 solution extends the read volume of RFID tags with a uniform magnetic field, reducing costs and improving data reading accuracy by generating a stronger magnetic field over a wider area without the need for multiple antennas.
Implementation Method 1
Such wires are activated with the electrical current to create an electromagnetic field, also known as a magnetic field, an 'H field,' or the related 'B field,' at the center of the loop.
Implementation Method 2
The generated magnetic field is instrumental in detecting and reading RFID tags in the RFID system.
Data Source
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AI summary
An RFID antenna 100 comprises two or more electroconductive sheets 120a, b of uniform planar size, being parallel and aligned, with a space therein between. Each electroconductive sheet 120a, b comprises: a feed connection point 130a, which receives an electrical current from a feed 110 to supply current to the electroconductive sheet 120a, b; and a return connection point 130b, opposite and parallel to the feed connection point 130a of the electroconductive sheet 120a, b, which acquires current from the electroconductive sheet 120a, b and transfers current to a return 140. The electrical circuit pathway created from the feed 110 to the return 140 is equal distance for each electroconductive sheet 120a, b. The two electroconductive sheets 120a, b are connected together to complete a circuit that causes direction of electrical flow in the one electroconductive sheet 120a to be opposite to direction of electric flow in the other electroconductive sheet 120b.