3D Tag Antenna Layout for Passive RFID Temperature Sensing
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Solution Overview
Problem
Current RFID tag antennas are limited in their functionality and applicability to complex environments, particularly lacking in multi-functional capabilities and adaptability for diverse environmental conditions.
Innovation Solution
A tag antenna design featuring a feeder with specific conducting wire configurations and a three-dimensionally distributed electric conductor setup, integrated with a passive temperature detection apparatus that includes a probe assembly and temperature sensor, enabling the conversion of radio signals into electrical energy for temperature detection and feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional single-function RFID tag antenna is used, then the manufacturing cost is low and design is simple, but the adaptability to complex environments and multi-functional capabilities are limited
Solution Approach 1:
The patent applies multi-functionality by integrating temperature detection capability into the RFID tag antenna system. The temperature sensor is embedded within the antenna structure, allowing the same device to perform both RFID communication and temperature monitoring functions, thereby improving adaptability to complex environments without requiring separate detection devices
Solution Approach 2:
The patent merges the temperature sensor with the antenna structure by placing the sensor inside the antenna housing and connecting it to the circuit board. This combination integrates multiple functions (RFID identification and temperature detection) into a single unified device, enhancing versatility while managing structural complexity
2Speed
If an active tag antenna with battery is used, then the reading distance reaches tens to hundreds of meters, but the service life is limited and costs are high
Solution Approach 1:
The patent employs passive power harvesting by converting received RF signals into electrical energy through the rectifying circuit. This self-powered approach eliminates the need for an external battery, enabling the temperature sensor to operate continuously without replacing power sources, thus extending service life indefinitely while maintaining acceptable reading distances
Solution Approach 2:
The patent replaces the mechanical battery-powered system with an electromagnetic energy conversion system. The rectifying circuit converts RF electromagnetic energy into electrical energy to power the temperature sensor, substituting the chemical energy storage (battery) with direct energy conversion from the RF field, thereby eliminating battery replacement needs
3Ease of manufacture
If a passive tag antenna is used, then the manufacturing cost is low and design is simple, but the reading distance is limited compared to active tags
Solution Approach 1:
The patent achieves multi-functionality by integrating temperature detection into the passive antenna structure. The same antenna that receives RF signals for identification also harvests energy to power the temperature sensor, enabling additional functionality without significantly increasing manufacturing cost or complexity
Solution Approach 2:
The passive antenna system performs self-powering by converting received RF signals into electrical energy through the rectifying circuit. This eliminates the need for external power sources or batteries, keeping manufacturing costs low while enabling continuous operation of the temperature sensor within the antenna's operational range
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
Facilitates temperature detection at any angle, enhancing the antenna's adaptability and functionality in various environments, including high-temperature settings, with improved performance and cost-effectiveness.
Implementation Method 1
the tag antenna receives an external first radio signal, and converts the first radio signal into electrical energy, to activate the temperature sensor
Data Source
AI summary
A tag antenna comprises a feeder comprising a first conducting wire and a second conducting wire; a first electric conductor, a second electric conductor, and a third electric conductor that are elongated; a first connecting conductor; and a second connecting conductor. The first connecting conductor is separately connected to lower ends of the first electric conductor, the second electric conductor, and the third electric conductor; the second connecting conductor is connected to at least one of the first electric conductor, the second electric conductor, and the third electric conductor; and the first connecting conductor and the second connecting conductor are spaced apart, the first conducting wire of the feeder is connected to the first connecting conductor, and the second conducting wire is connected to the second connecting conductor. The embodiments of the present disclosure further provide a passive temperature detection apparatus.