Moisture-Containing RFID Tag Prevents Microwave Ignition
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Solution Overview
Problem
RFID tags attached to food items risk ignition when heated in microwave ovens due to energy absorption and potential discharge in metal materials, with existing flame-retardant tags not adequately preventing combustion.
Innovation Solution
A wireless communication device with a moisture-containing application member integrated into the base material or antenna pattern, which absorbs microwave power and reduces temperature rise through vaporization, preventing ignition by dissipating heat and reducing microwave power exposure to the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a metal antenna pattern is provided on a base material for RFID communication, then wireless communication functionality is achieved, but the risk of ignition and combustion increases during microwave heating
Solution Approach 1:
A moisture-containing application member is introduced as an intermediary between the metal antenna pattern and the microwave field. This member absorbs microwave energy and converts it to heat, which then vaporizes the moisture to create a protective atmosphere that prevents ignition of the base material and metal components during heating
Solution Approach 2:
The invention changes the physical state of moisture from liquid to vapor through heating. The vaporized moisture creates a protective atmosphere that alters the thermal and chemical environment around the RFID tag components, preventing combustion while maintaining communication functionality
2Object-affected harmful factors
If flame-retardant base material is used to prevent combustion, then base material ignition is reduced, but metal material discharge and product ignition risk remain
Solution Approach 1:
The moisture-containing application member acts as a mediator that absorbs microwave energy and converts it to thermal energy, creating a controlled heating effect that vaporizes moisture to form a protective atmosphere. This atmosphere prevents metal discharge and product ignition by reducing the effectiveness of the microwave field in directly heating these components
Solution Approach 2:
The invention converts the harmful microwave energy that causes ignition into beneficial thermal energy by using the moisture-containing member to absorb and convert microwave power. The resulting heat vaporizes the moisture, creating a protective atmosphere that prevents ignition - thus converting the harmful heating effect into a protective mechanism
3Productivity
If high-power microwave heating is applied to heated food items, then heating efficiency is improved, but the risk of RFID tag ignition increases due to rapid temperature rise
Solution Approach 1:
The moisture-containing application member serves as an intermediary that preferentially absorbs microwave energy and converts it to heat. This creates a localized heat source that rapidly vaporizes the moisture, forming a protective atmosphere that prevents ignition even during high-power microwave heating operations
Solution Approach 2:
The moisture-containing member is pre-positioned on the RFID tag before heating occurs. When microwave heating is applied, the moisture rapidly vaporizes in advance, creating a protective atmosphere before ignition can occur. This preliminary vaporization action prevents subsequent ignition risks during high-power heating
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
Effectively prevents ignition and combustion of RFID tags and attached products during microwave heating by efficiently absorbing and dissipating microwave energy, ensuring safe operation in high-frequency power environments.
Implementation Method 1
the moisture-containing application member has a high heating efficiency in microwave heating
Implementation Method 2
vaporization of the moisture changes an atmosphere around the wireless communication device
Implementation Method 3
the water vapor of the moisture absorbs the microwave power, thereby reducing the microwave power to which a circuit including the antenna pattern is subjected
Data Source
AI summary
An RFID tag is provided that transmits and receives a communication signal. The RFID tag includes a base material, antenna patterns provided on the base material, an RFIC package that is a feeding circuit connected to the antenna patterns, and an ignition protection member provided on the base material or the antenna patterns. Moreover, the ignition protection member contains moisture, such that ignition and combustion can be prevented even in a situation where the RFID tag is subjected to high-frequency power for heating a food item while attached to the food item or the like.