RFID Repeater Frequency Transposition for Interference Reduction
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Solution Overview
Problem
Existing RFID systems face challenges in communicating with non-standard frequency RFID devices, leading to interference and high installation and maintenance costs due to the need for custom readers and complex antenna configurations.
Innovation Solution
An additional RFID device performs analog frequency transposition from standard RFID reader frequencies to different frequencies, allowing communication with non-standard frequency devices without changing existing infrastructure and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If directional antennas are used to isolate communication frequencies, then interference is reduced, but device complexity and cost increase
Solution Approach 1:
The patent changes the frequency parameter of the interrogation signal from the standard RFID frequency (e.g., 900 MHz) to a different frequency (e.g., 2.45 GHz). This frequency transformation allows the Power Node to communicate with transponders at non-standard frequencies without requiring complex directional antennas, thus reducing device complexity while still avoiding interference
Solution Approach 2:
The Power Node acts as an intermediary device that receives interrogation signals at one frequency and transmits them at another frequency. This intermediary function enables frequency conversion without requiring the main reader to have multiple antennas or complex directional configurations, simplifying the overall system while avoiding interference
2Adaptability or versatility
If custom readers are designed for non-standard frequencies, then communication with specific devices is enabled, but development cost and time increase
Solution Approach 1:
The Power Node is designed as a universal intermediary that can handle frequency conversion between standard RFID frequencies and various non-standard frequencies. This multi-functional capability allows a single device to work with multiple types of transponders operating at different frequencies, eliminating the need for custom readers for each frequency and reducing development costs
Solution Approach 2:
By changing the operating frequency parameter of the interrogation signal, the system can adapt to work with transponders at different frequencies using the same hardware platform. This parameter transformation approach maintains versatility while avoiding the high development costs associated with designing custom readers for each frequency
3Device complexity
If frequency F0 is used for both reader-Power Node and Power Node-transponder communication, then simpler communication is achieved, but self-blinding interference occurs
Solution Approach 1:
The system uses different frequencies for transmission and reception phases, creating a periodic alternation between frequency F0 (for reader-Power Node communication) and frequency F1 (for Power Node-transponder communication). This periodic frequency switching prevents self-blinding by ensuring that the Power Node does not transmit and receive at the same frequency simultaneously
Solution Approach 2:
The Power Node changes the frequency parameter when retransmitting interrogation signals to transponders. It receives signals at frequency F0 and transmits them at frequency F1, which is different from F0. This parameter transformation eliminates self-blinding interference while maintaining relatively simple communication protocols
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 enhances communication distance and precision while maintaining low costs by avoiding self-blinding phenomena and eliminating the need for complex directional antennas.
Implementation Method 1
transposing a frequency F0 of the interrogation signal into a frequency F1 different from F0
Data Source
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AI summary
According to one aspect, the present invention relates to a system for electromagnetically querying RFID transponders (300). Said system includes: - at least one RFID terminal (100) configured so as to transmit a query signal at a frequency F1; and - at least one RFID device referred to as a "repeater" (200) configured so as to receive the query signal of Frequency F1 and repeat it to at least one RFID transponder (300) at Frequency F2. Said system is characterized in that the at least one RFID terminal includes at least one RFID reader (110), configured to transmit a query signal of Frequency F0, and at least one additional RFID device (120), configured so as to carry out a frequency from Frequency 0 to Frequency 1, Frequencies F0 and F1 being different.