RFID Sensor Circuitry with Protection Layer for Metal Environments

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Solution Overview

Problem

Conventional radio frequency identification (RFID) sensors face challenges in operating effectively in metallic and liquid environments due to electromagnetic field attenuation by metals and liquids, leading to impaired communication and readability issues.

Innovation Solution

The implementation of radio frequency sensor circuitry with a protection material and a metallic layer, which includes a thin passivating layer such as an inert polymer or ferrite material to isolate the sensor from metal surfaces and fluids, allowing the sensor to operate by attenuating undesirable electromagnetic flux and quenching unwanted signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If RFID sensor circuitry is placed in proximity to metal surfaces, then the sensor can be used in metallic environments, but electromagnetic field attenuation occurs and communication is impaired

Engineering Contradiction:

Improveability to operate in metallic environmentsVSAvoidcommunication reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A protection material layer is introduced as an intermediary between the RFID sensor circuitry and the metal surface. This intermediate layer prevents direct interaction between the electromagnetic field and the metal, eliminating eddy current effects while allowing the sensor to function in metallic environments.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The sensor structure is segmented into distinct functional layers: the RFID sensor circuitry layer, the protection material layer, and optionally a metallic layer for quenching signals. This segmentation allows each layer to perform its specific function independently, with the protection layer isolating the sensitive circuitry from metal interference.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If conventional RFID tags are used without protection material, then the device complexity is low, but electromagnetic flux attenuation by metals impairs readability

Engineering Contradiction:

Improvestructure simplicityVSAvoidelectromagnetic field attenuation

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The protection material serves as a mediator that blocks the harmful electromagnetic interaction between the RFID tag and metal surfaces. This simple intermediate layer prevents eddy current formation without requiring complex redesign of the RFID circuitry itself.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The protection material is implemented as a thin film or coating that can be applied to the RFID sensor circuitry. This thin film approach provides effective electromagnetic isolation while adding minimal complexity and maintaining the overall simplicity of the device structure.

Inventive Principle:

Principle #30Flexible shells and thin films

3Reliability

If a protection material and metallic layer are added to the sensor, then electromagnetic flux attenuation is prevented, but the device complexity increases

Engineering Contradiction:

Improvesensor operation reliability in metal environmentsVSAvoidmulti-layer structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sensor assembly is divided into distinct functional segments: the core RFID sensor circuitry, the protection material layer, and the optional metallic layer. This segmentation allows for modular manufacturing and assembly, where each layer can be produced and tested independently before being combined into the final multi-layer structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sensor structure utilizes composite material construction with different layers serving different functions. The protection material layer provides electromagnetic isolation, while the metallic layer (when used) provides additional signal quenching. This composite approach achieves reliable operation in metallic environments through material properties rather than complex circuit design.

Inventive Principle:

Principle #40Composite materials

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 RFID sensors to function reliably on metal surfaces and in liquid environments by preventing electromagnetic flux attenuation, enhancing their usability in diverse applications such as biopharmaceutical manufacturing and homeland security.

Implementation Method 1

a metallic surface disposed adjacent to the protection film

Methodology Applied

Scientific EffectElectromagnetic flux attenuation: Absorption (EM radiation)

Implementation Method 2

a protection material disposed on the radio frequency sensor circuitry

Methodology Applied

Scientific EffectElectromagnetic isolation:

Implementation Method 3

a metallic surrounding for quenching predetermined signals from the radio frequency sensor circuitry

Methodology Applied

Scientific EffectSignal quenching: Damping

Data Source

PatentUS8018342B2Radio frequency sensor circuitry sensing device

Publication Date: 2011.09.13 WESTINGHOUSE AIR BRAKE TECH CORP

AI summary

A sensing device adapted to detect environmental changes and/or an analyte is provided. The sensing device comprising radio frequency sensor circuitry, a protection material disposed on the radio frequency sensor circuitry, and a metallic layer disposed on the protection material. A detection system for detecting an environmental change or an analyte in an article is provided.