Bone-Shaped Magnetic Core Resonator for RFID Marker Weight Reduction
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Solution Overview
Problem
Conventional magnetic core resonant circuits used in EAS and RFID systems are bulky and heavy, which is undesirable, especially in applications like clothing, and they do not efficiently collect magnetic energy compared to bone-shaped magnetic core resonant circuits.
Innovation Solution
A bone-shaped magnetic core resonant circuit is employed, where a coil is disposed around a center portion of the core, connected in series with a passive electronic component to form an LC resonator, allowing for improved magnetic energy collection and reduced size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional cylindrical ferrite core resonant circuits are used, then the structure is simple and easy to manufacture, but the size and weight are bulky and heavy
Solution Approach 1:
The patent applies asymmetry by changing the magnetic core from a conventional cylindrical shape to a bone-shaped structure with an asymmetric cross-section. The bone-shaped core has a first end portion, a second end portion, and a center portion with varying cross-sectional areas, creating an asymmetric geometry that reduces overall volume and weight while maintaining magnetic functionality. This asymmetric design allows the core to achieve the same magnetic energy collection with less material, directly resolving the contradiction between structural simplicity and weight reduction.
Solution Approach 2:
The patent employs dimensionality change by transitioning from a two-dimensional cylindrical cross-section to a three-dimensional bone-shaped structure with varying cross-sectional areas along its length. The bone-shaped core features end portions with larger cross-sectional areas and a center portion with a smaller cross-sectional area, creating a tapered, dimensional variation that optimizes magnetic flux distribution. This dimensional approach allows efficient magnetic energy collection with reduced material volume, addressing the weight issue while preserving manufacturing feasibility.
2Ease of manufacture
If conventional cylindrical ferrite core resonant circuits are used, then the structure is simple and easy to manufacture, but the magnetic energy collection efficiency is insufficient
Solution Approach 1:
The asymmetric bone-shaped core design optimizes magnetic flux distribution by creating varying cross-sectional areas along the core length. The end portions with larger cross-sectional areas capture more magnetic flux, while the center portion with smaller area allows for better flux concentration and coupling with the coil. This asymmetric geometry enhances magnetic energy collection efficiency compared to uniform cylindrical cores, while the overall structure remains manufacturable using conventional techniques.
Solution Approach 2:
The patent applies local quality by designing different sections of the magnetic core with different cross-sectional areas optimized for specific functions. The end portions have larger cross-sectional areas for maximum flux capture, while the center portion has a smaller area for efficient coil coupling and reduced saturation. This localized optimization of core geometry enhances overall magnetic energy collection efficiency without requiring complex manufacturing processes.
3Use of energy by moving object
If the coil is disposed around the center portion of the bone-shaped core, then the magnetic energy collection is improved, but the device complexity increases
Solution Approach 1:
The bone-shaped core is segmented into distinct portions: a first end portion, a second end portion, and a center portion, each with optimized cross-sectional areas. The coil is strategically positioned around the center portion where magnetic flux concentration is highest, maximizing energy collection. This segmentation approach allows the complex magnetic geometry to be manufactured using standard techniques while maintaining improved magnetic coupling between the coil and core.
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 bone-shaped magnetic core resonant circuit enhances detection performance by collecting a larger amount of magnetic energy, resulting in better performance for EAS/RFID markers compared to conventional cylindrical ferrite core systems, with a 17% increase in magnetic field strength and improved detection capabilities.
Implementation Method 1
The resonator resonates when an interrogation signal is produced by a transmitter circuit located remote from and in proximity to the marker, whereby a variation in a magnetic field occurs.
Implementation Method 2
The coil is coupled to a passive electronic component so as to form a resonator. The resonator resonates when an interrogation signal is produced by a transmitter circuit
Implementation Method 3
The bone-shaped magnetic core resonant circuit enhances detection performance by collecting a larger amount of magnetic energy, resulting in better performance for EAS/RFID markers compared to conventional cylindrical ferrite core systems, with a 17% increase in magnetic field strength
Data Source
AI summary
Systems (100) and methods (1700) for providing a marker (102). The methods comprise forming a magnetic core (200) having a bone shape defined by two end portions (208, 212) and a center potion (210) disposed between the two end portions. The end portions each have a cross-sectional area larger than a cross-sectional area of the center portion. A coil (224) is disposed around the center portion. The coil is coupled to a passive electronic component (206) so as to form a resonator. The resonator is disposed in a housing (126) of the marker. The resonator resonates when an interrogation signal is produced by a transmitter circuit (112) located remote from and in proximity to the marker, whereby a variation in a magnetic field occurs.