Temperature-Sensing RFID Tag Shielding for Accurate Article Readings
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Solution Overview
Problem
Existing temperature-sensing RFID devices struggle to accurately measure the temperature of an article due to interference from environmental conditions, which can lead to incorrect temperature readings.
Innovation Solution
The implementation of a shielding structure and a thermally conductive or absorbent structure in the RFID device to protect the temperature sensor from environmental factors and enhance thermal coupling with the article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the RFID device is exposed to the environment for easy operation, then the device can be easily attached and read, but the temperature sensor measures environmental temperature instead of article temperature
Solution Approach 1:
The RFID device is segmented into distinct functional zones: an environmental interface portion (antenna, housing) that interacts with the external environment, and a protected sensing portion (temperature sensor, RFID chip) that is thermally isolated from the environment. This segmentation allows the device to be easily attached while maintaining measurement accuracy by preventing thermal coupling between the sensor and environmental factors.
2Device complexity
If the RFID chip is directly exposed to the environment, then the device structure is simple, but the temperature reading reflects environmental conditions rather than article conditions
Solution Approach 1:
A non-conductive, non-metallic barrier layer is introduced as an intermediary between the RFID chip and the external environment. This barrier layer is thermally insulating yet allows RF signals to pass through, serving as a mediator that blocks harmful thermal pathways while maintaining electromagnetic communication. This adds minimal structural complexity while significantly improving measurement accuracy.
3Measurement precision
If shielding structures are added to protect from environmental factors, then temperature measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent employs thin-film barrier layers and flexible shielding structures that provide thermal protection while maintaining device flexibility and minimizing added complexity. These thin films are integrated into the existing device architecture rather than adding bulky external shields, thus improving measurement accuracy with minimal impact on device complexity.
Solution Approach 2:
The RFID device utilizes composite material structures combining materials with different thermal and electromagnetic properties. The housing and barrier layers are constructed from composite materials that provide thermal insulation while maintaining RF signal transparency, achieving protection from environmental factors without significantly increasing device complexity.
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 configuration improves the accuracy of temperature measurements by isolating the RFID chip from environmental influences and ensuring that the temperature sensed is that of the article rather than the environment.
Implementation Method 1
a shielding structure and a thermally conductive or absorbent structure in the RFID device to protect the temperature sensor from environmental factors
Implementation Method 2
a shielding structure and a thermally conductive or absorbent structure in the RFID device to protect the temperature sensor from environmental factors and enhance thermal coupling with the article
Data Source
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AI summary
A temperature-sensing RFID device includes an RFID chip and an antenna electrically coupled thereto. The RFID chip includes a temperature sensor, while the antenna is adapted to receive energy from an RF field and produce a signal. A shielding structure and/or a thermally conductive or absorbent structure may be associated with the RFID chip. The shielding structure is oriented so as to be positioned between at least a portion of the RFID chip and an outside environment and configured to shield the temperature sensor from at least one environmental factor capable of affecting a temperature sensed by the temperature sensor of an article to which the RFID device is secured. The thermally conductive or absorbent structure is oriented so as to be positioned between at least a portion of the RFID chip and the article and configured to enhance thermal coupling between the temperature sensor and the article.