RFID Repeater Separates Excitation and Backscatter Paths
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Solution Overview
Problem
Conventional radio frequency identification systems have limited communication distance and sensitivity due to interference between excitation and backscatter signals, which hampers effective data retrieval from tags.
Innovation Solution
Incorporating a repeater that receives a signal from the reader and sends an excitation signal to the tag, thereby separating the excitation and backscatter signal paths to increase communication distance and improve signal sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the reader directly sends the excitation signal to the tag, then the system structure is simple, but the communication distance is limited and the reader sensitivity is low due to signal interference
Solution Approach 1:
The patent introduces a repeater as an intermediary device between the reader and the tag. The repeater receives the excitation signal from the reader, amplifies it, and retransmits it to the tag. This mediator extends the communication distance without significantly increasing system complexity, as the repeater performs a relatively simple signal amplification function.
2Device complexity
If the reader directly sends the excitation signal to the tag, then the system structure is simple, but the reader sensitivity is low due to full-duplex interference between excitation and backscatter signals
Solution Approach 1:
The patent segments the signal transmission function by separating the excitation signal transmission from the backscatter signal reception. The repeater handles only the excitation signal transmission, while the reader focuses on receiving the backscatter signal from the tag. This segmentation eliminates the full-duplex interference that occurs when the reader simultaneously transmits and receives signals, thereby improving reader sensitivity.
3Length of stationary object
If a repeater is introduced to extend communication distance, then the communication distance increases, but the system complexity increases
Solution Approach 1:
The repeater serves as a simple intermediary that performs basic signal amplification and retransmission functions. By keeping the repeater's functionality minimal and focused, the system extends communication distance without introducing excessive complexity. The repeater can be implemented as a relatively simple device compared to the reader, maintaining overall system simplicity while achieving the distance extension goal.
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 enhances the communication distance and sensitivity of the radio frequency identification system, allowing for more accurate and reliable data retrieval from tags without interference.
Implementation Method 1
sending, by the tag, a backscatter signal to the reader under excitation of the excitation signal
Implementation Method 2
The tag is configured to send a target backscatter signal based on excitation of the excitation signal
Data Source
AI summary
This application discloses example radio frequency identification systems and example methods for constructing a relay network, a reader, and a repeater. One example radio frequency identification system includes a reader, a repeater, and a target tag. The reader can be configured to send a first signal to the repeater. The repeater can be configured to send an excitation signal to the target tag based on the first signal. The target tag can be configured to send a target backscatter signal based on excitation of the excitation signal, where the target backscatter signal carries electronic product code information. The reader can be further configured to receive the target backscatter signal and obtain the electronic product code information in the target backscatter signal.