Mass-Loaded Magnetoelastic Resonator for Frequency-Stable Miniaturization
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Solution Overview
Problem
Miniaturization of magnetoelastic resonators increases operating frequency, making it challenging to maintain resonant frequency in applications like anti-theft tags, which require compatibility with existing security station infrastructure.
Innovation Solution
Designing a magnetoelastic resonator with a mass load portion and an active resonating portion, where displacement occurs at both, and correlating the size of the mass with the magnetoelastic body to maintain resonant frequency, allowing for miniaturization while keeping the resonant frequency consistent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the resonator dimensions are reduced for miniaturization, then the operating frequency increases, but this requires changes to transmit/receive hardware and signal processing
Solution Approach 1:
The resonator is divided into distinct regions with different properties: a mass load portion with higher density material and an active resonating portion with different dimensional characteristics. This local differentiation allows the mass portion to contribute to lowering the operating frequency while the resonating portion maintains the desired frequency characteristics, resolving the contradiction between miniaturization and frequency control
Solution Approach 2:
The patent employs parameter changes by varying the density, mass, and dimensional parameters of different portions of the resonator. Specifically, the mass load portion has different density and mass parameters compared to the active resonating portion, allowing independent optimization of frequency characteristics while maintaining miniaturized overall dimensions
2Volume of moving object
If the resonator dimensions are reduced for miniaturization, then the resonator size decreases, but maintaining the same operating resonant frequency becomes challenging
Solution Approach 1:
By creating distinct mass load and active resonating portions with different local properties, the patent enables the mass portion to provide inertial stability for frequency maintenance while the resonating portion responds to external stimuli, achieving both miniaturization and frequency stability
Solution Approach 2:
The mass load portion acts as a counterweight that provides inertial resistance to frequency shifts. This concentrated mass helps stabilize the resonant frequency by providing a reference inertia that compensates for the reduced overall size of the miniaturized resonator
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 the miniaturization of security tags to accommodate smaller retail items without altering the existing security station infrastructure, maintaining performance and reducing material costs while maintaining the desired resonant frequency.
Implementation Method 1
a magnetoelastic body having a mass load portion and an active resonating portion
Data Source
AI summary
A resonator comprising a magnetoelastic body having a mass load portion and an active resonating portion can be used in implementations such as a security tag. The resonator includes a mass at the mass load portion of the magnetoelastic body. Displacement of the magnetoelastic body is configured to occur at both the mass load portion and the active resonating portion. A strain at the active resonating portion during displacement is configured to be greater than a strain at the mass load portion during displacement.