RFID Memory Device With Orthogonal Resonant Arrays
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Solution Overview
Problem
Existing RFID memory devices and interrogation methods face challenges in maximizing the impedance change caused by mechanical resonance, which affects data reading efficiency, especially due to the small magnitude of impedance change compared to background impedance in Lorentz force/Faraday induction based coupling.
Innovation Solution
The solution involves a memory device with two arrays of resonant members extending in orthogonal directions, where the energy associated with vibration is transformed into a change in impedance of an electrical equivalent circuit, allowing for maximized impedance change by orienting the magnetic field perpendicular to the resonant members' directions, and a method for calibrating and re-orienting the magnetic field to selectively read data from each array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Lorentz force/Faraday induction based coupling is used to vibrate resonant members, then the resonant members can be actuated and their response detected, but the impedance change caused by resonance is very small compared to background impedance, making accurate data reading difficult
Solution Approach 1:
The patent applies local quality by creating directional sensitivity in the resonant member arrays. Each array is oriented to respond maximally to magnetic fields in specific directions, allowing selective interrogation of different arrays with magnetic fields applied at different angles. This directional differentiation enables the system to isolate and detect impedance changes from specific resonant member arrays, effectively separating the signal from background impedance interference.
Solution Approach 2:
The patent introduces a spatial dimension to the interrogation process by using multiple resonant member arrays oriented in different directions. Instead of relying solely on frequency differentiation, the system adds angular/orientational differentiation as another dimension for data encoding and retrieval. By applying magnetic fields at different angles and detecting responses from arrays with different orientations, the system can resolve impedance changes more accurately despite background interference.
2Quantity of substance
If multiple resonant member arrays are used to encode data, then data storage capacity is increased, but the complexity of selectively reading data from each array increases
Solution Approach 1:
The patent uses local quality by assigning different directional sensitivities to different resonant member arrays. Each array is configured to respond maximally to magnetic fields in its specific orientation direction. During interrogation, the system applies magnetic fields at different angles to selectively excite and read data from specific arrays, simplifying the reading process by spatially separating the interrogation of different data sets.
Solution Approach 2:
The patent applies dynamics by making the magnetic field direction variable and controllable during interrogation. The system can dynamically adjust the angle and direction of applied magnetic fields to selectively target different resonant member arrays. This dynamic control of field orientation enables flexible and simplified reading of data from multiple arrays without requiring complex simultaneous multi-directional field generation.
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 approach enhances data reading efficiency by maximizing the impedance change caused by resonance, allowing for accurate detection of data encoded in each resonant member array, even when the background impedance is significant, thereby improving the overall data retrieval process.
Implementation Method 1
One electrodynamic interaction which may be employed in a RFID tag is Lorentz force/Faraday induction. An alternating electrical current is induced in the coil antenna (and hence the conductor) by a corresponding coil in the interrogation circuit.
Implementation Method 2
The lines of this magnetic field are so oriented that a Lorentz force associated with the alternating electrical current flowing through the conductor tends to displace the vibrating members from an equilibrium position.
Implementation Method 3
Each vibrating member is fabricated to have a distinct resonant frequency. When the frequency of the applied alternating electrical current corresponds to the resonant frequency of a particular vibrating member, that member is caused to mechanically resonate.
Data Source
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AI summary
An RFID memory device includes two arrays of resonant members. A first array extends in a first member direction and a second array extends in a second member direction. The device includes one or more elements for transforming energy associated with vibration of the resonant members into a change in impedance of an electrical equivalent circuit of the memory device. The magnitude of impedance change caused by resonance of the first resonant members is maximised at a different magnetic field direction to that at which the magnitude of the impedance change caused by resonance of the second resonant members is maximised. Thus, different data may be encoded on each array and separately read. The resonant members may form part of a common electrical conductor that forms a coupling element for coupling with an applied excitation signal and causing vibration of the resonant members.