RFID Tag IC Dynamic Duty Cycle Adjustment
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Solution Overview
Problem
Conventional RFID systems have limited communication ranges, which are affected by various factors such as interference, tag orientation, frequency, and environmental conditions, making them inefficient in applications like inventory management and asset tracking.
Innovation Solution
The system includes an RFID tag with an integrated circuit (IC) that comprises a resonant capacitor, an analog front-end circuit, a digital controller, and an RF signal strength detector. The method involves matching the input RF signal, converting it to a DC signal, sensing current or voltage, comparing the output, modulating the signal, and transmitting it to the RFID reader.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional RFID systems are used, then the system is simple and low-cost, but the communication range is limited
Solution Approach 1:
The patent implements dynamic duty cycle adjustment in the RFID tag's transmission circuit. The controller dynamically changes the duty cycle of the transmitted signal based on detected signal conditions, allowing the system to adapt to varying communication distances and environmental interference without requiring additional hardware components.
Solution Approach 2:
The patent changes the duty cycle parameter of the RFID tag's transmitted signal to extend communication range. By adjusting this temporal parameter rather than increasing power or adding components, the system achieves extended range while maintaining simplicity and low cost.
2Length of stationary object
If output power of RFID reader is increased to extend communication range, then communication range improves, but energy consumption and system cost increase
Solution Approach 1:
The patent implements dynamic duty cycle adjustment in the RFID tag's transmission circuit. The controller dynamically changes the duty cycle of the transmitted signal based on detected signal conditions, allowing the system to adapt to varying communication distances and environmental interference without requiring additional hardware components.
Solution Approach 2:
The patent uses periodic modulation of the transmitted signal through duty cycle adjustment. By varying the on/off timing of the transmission signal periodically, the system optimizes energy usage while maintaining communication effectiveness across different distances.
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 solution increases the communication range of RFID tags while minimizing additional circuit area, resulting in a low-cost, easy-to-set-up system with reduced complexity, thereby enhancing the efficiency of RFID communication.
Implementation Method 1
The tag includes an antenna and an integrated circuit (IC). The IC includes a resonant capacitor, a front-ended circuit, a digital controller and an RF signal strength detector.
Implementation Method 2
The method involves matching the input RF signal, converting it to a DC signal, sensing current or voltage, comparing the output, modulating the signal, and transmitting it to the RFID reader.
Implementation Method 3
comparing the output, modulating the signal, and transmitting it to the RFID reader
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
A system to increase the communication range of Radio Frequency Identification (RFID) tags is a novel system and method for increasing the communication range of RFID tags. The system includes antennas, RFID integrated circuit (RFID IC). The RFID IC includes various components such as resonant capacitor, front-ended circuit, digital controller and radio frequency (RF) signal strength detector. The method to increase communication range of RFID tags includes connecting RFID tags antenna to terminals of RFID IC, matching input RF signal, converting AC signal to DC signal, sensing current or voltage, comparing the output voltage, modulating and determining signal