Capacitance RFID Tag for Humidity and Gas Exposure Detection
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Solution Overview
Problem
Commercial products are susceptible to damage or loss of efficacy due to excessive humidity or gas exposure, with existing monitoring methods being inadequate for detecting and reporting such conditions effectively.
Innovation Solution
A capacitance-based RFID tag system incorporating a humidity or gas indicator with electrodes and a dielectric material that changes capacitance in response to environmental stimuli, allowing for detection and reporting of humidity or gas levels through integrated circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional RFID tags are used without environmental sensing capabilities, then the device complexity is low and manufacturing cost is reduced, but the ability to detect and monitor humidity or gas exposure is insufficient
Solution Approach 1:
The patent combines RFID tag functionality with environmental sensing capabilities by integrating a humidity or gas indicator directly into the RFID tag structure. The indicator includes electrodes and dielectric material that form a capacitor, where the dielectric constant changes in response to humidity or gas exposure. This merging allows the RFID tag to simultaneously perform identification and environmental monitoring functions.
Solution Approach 2:
The RFID tag is designed to perform multiple functions: traditional identification/tracking and environmental sensing. The humidity or gas indicator serves as a multi-functional component that detects environmental conditions while being electrically connected to the RFID circuit, enabling the single device to provide both RFID communication and environmental monitoring capabilities.
2Reliability
If a humidity or gas indicator is integrated into the RFID tag, then real-time environmental monitoring capability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The invention utilizes changes in the dielectric constant of the dielectric material in response to humidity or gas exposure. This parameter change approach allows the sensor to detect environmental conditions through electrical property changes rather than requiring complex mechanical or chemical sensing mechanisms, simplifying the overall manufacturing process while maintaining reliability.
Solution Approach 2:
The dielectric material acts as an intermediary between the environmental stimulus (humidity or gas) and the RFID circuit. It transduces the environmental condition into an electrical signal by changing its dielectric constant, which then affects the capacitance of the indicator and can be detected by the RFID system, bridging the gap between environmental sensing and electronic detection.
3Adaptability or versatility
If the dielectric material is exposed to extreme humidity or gas conditions, then the sensing range is improved, but the material may degrade or lose efficacy over time
Solution Approach 1:
The humidity or gas indicator is designed as a disposable or single-use component that can be discarded after providing its sensing function. This approach allows the use of dielectric materials that are highly sensitive to environmental conditions but may degrade over time, as the indicator is replaced rather than maintained. The low cost of the indicator enables this disposable strategy.
Solution Approach 2:
The RFID tag system is designed to detect environmental conditions before they reach levels that would cause product spoilage or damage. By providing early warning through the humidity or gas indicator, the system prevents the need for the dielectric material to withstand extreme conditions for extended periods, thereby protecting both the product and the sensor from degradation.
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 real-time monitoring of humidity or gas levels, reducing waste and ensuring product safety by providing alerts for potentially hazardous conditions.
Implementation Method 1
The dielectric material may be configured to have a change in its dielectric constant responsive to exposure to an environmental stimulus, which may be at least one of humidity or the presence of a gas
Data Source
AI summary
An RFID tag system includes an antenna, an integrated circuit electrically connected to the antenna, and a humidity or gas indicator being electrically connected to the antenna and the integrated circuit. The humidity or gas indicator includes a first electrode, a second electrode, a dielectric material, and a gap between the first electrode and the second electrode. At least a portion of the gap contains the dielectric material. The dielectric material is configured to have a change in its dielectric constant responsive to exposure to an environmental stimulus, which may be at least one of humidity or the presence of a gas. The change in the dielectric constant of the dielectric material changes a capacitance of the humidity or gas indicator, causing the integrated circuit to indicate the presence of the environmental stimulus.