Dual-Antenna RFID Tag Circuit for Power-Communication Isolation
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Solution Overview
Problem
Existing RFID technologies face challenges with battery-powered tags due to high costs and interference between power supply and communication functions in passive tags, limiting their sensitivity and efficiency.
Innovation Solution
A dual-carrier-powered RFID tag circuit with independent antenna modules for power supply and communication, utilizing two antenna units with different polarization directions and frequency ranges to separate power and communication functions, enabling efficient and interference-free signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single antenna is used for both power supply and communication in passive RFID tags, then device complexity is reduced, but communication sensitivity and transmission performance deteriorate due to interference between power supply and communication functions
Solution Approach 1:
The patent divides the single antenna into two separate antenna modules: a first antenna module dedicated to power supply and a second antenna module dedicated to communication. This segmentation eliminates the interference between power supply and communication functions while maintaining relatively simple device structure.
Solution Approach 2:
The patent extracts the power supply function from the communication antenna by using a separate first antenna module for power supply and a second antenna module for communication. This extraction resolves the interference problem between the two functions.
2Measurement precision
If battery-powered chips are used in active and semi-active RFID tags, then communication performance is improved, but cost and operational complexity increase due to battery replacement requirements
Solution Approach 1:
The patent makes the first antenna module serve dual purposes: it supplies power to the chip and also assists in signal transmission. This multi-functionality eliminates the need for batteries while maintaining good communication performance and reducing cost.
Solution Approach 2:
The patent combines the power supply function and signal transmission function into a unified system where the first antenna module both powers the chip and assists in transmission, eliminating the need for separate battery components.
3Device complexity
If the operating frequencies of two antenna modules are too close, then device complexity is reduced, but harmful interference between power supply and communication functions increases
Solution Approach 1:
The patent changes the operating frequency parameter by setting the first antenna module to operate at frequency f1 and the second antenna module to operate at frequency f2, where f1 and f2 are sufficiently different. This parameter change effectively reduces interference while maintaining simple frequency management.
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
The solution provides a low-cost, high-sensitivity RFID tag by isolating power supply and communication functions, enhancing signal transmission and reception capabilities while reducing interference.
Implementation Method 1
The antenna transmits a received carrier signal to the chip for rectification, completing the power supply and communication tasks for the chip
Implementation Method 2
The RF port is connected to the antenna. The antenna transmits a received carrier signal
Data Source
AI summary
A dual-carrier-powered Radio Frequency Identification (RFID) tag circuit and a data transceiving method are provided, relating to the Internet of Things (IoT) and integrated circuit technologies, and in particular, to an RFID technology. The dual-carrier-powered RFID tag circuit includes an RFID chip and an antenna, where the RFID chip includes a signal receiving connection terminal, a signal transmitting connection terminal, and a power supply connection terminal; the antenna includes a first antenna module and a second antenna module; the first antenna module and the second antenna module are independent of each other; the power supply connection terminal of the RFID chip is connected to the first antenna module; the signal transmitting connection terminal and the signal receiving connection terminal of the RFID chip are connected to the second antenna module.