Portable RF Repeater Relays RFID Signals to Overcome Perimeter Blockage
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Solution Overview
Problem
In RFID systems, signal degradation and loss due to the arrangement of multiple RFID-enabled items can hinder effective communication between RFID readers and transponders, particularly those on the perimeter of groups, leading to incomplete data retrieval.
Innovation Solution
A portable RF repeater with a transceiver and antenna, capable of switching between a tag reading and data relay mode and a sleep mode, is introduced to enhance signal reception and transmission by relaying RFID signals and interrogation signals, using various wireless communication methods like Bluetooth or WLAN, and activating based on stimulus such as signal strength or external sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If RFID readers attempt to communicate with multiple RFID-enabled items in a group, then data collection coverage is improved, but signal degradation and loss increase due to perimeter items blocking signals
Solution Approach 1:
The patent introduces an RF repeater as an intermediary device positioned between the RFID reader and perimeter transponders. The repeater receives degraded signals from perimeter items and re-transmits them to the reader, effectively mediating the communication and eliminating the signal blocking problem without requiring the reader to send signals through the perimeter items.
Solution Approach 2:
The patent segments the RFID communication system into multiple functional components: the reader, the repeater, and the transponders. By dividing the communication path and introducing a dedicated repeater unit, the system can independently manage signal transmission and reception, allowing the reader to communicate with all items without being blocked by perimeter items.
2Reliability
If the RF repeater continuously monitors and relays signals to improve read rate, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic action by having the RF repeater monitor for interrogation signals from the reader and activate only when needed. The repeater remains in a low-power state during idle periods and transitions to active relaying only when interrogation signals are detected, ensuring reliable communication while minimizing energy consumption during non-active periods.
Solution Approach 2:
The repeater employs self-service mechanisms through automatic activation and deactivation based on detected signal conditions. The control unit autonomously determines when to begin relaying signals and when to return to sleep mode, eliminating the need for continuous power consumption while maintaining reliable operation when required.
3Speed
If the RF repeater activates immediately upon detecting interrogation signals, then response time is improved, but interference with local tags increases
Solution Approach 1:
The patent applies preliminary action by having the repeater detect and wait for interrogation signals from the reader before activating. This timing mechanism ensures the repeater only begins relaying signals after the reader has completed its interrogation sequence, preventing interference with local tags while maintaining rapid response to reader commands.
Solution Approach 2:
The system uses feedback mechanisms where the repeater monitors the communication protocol and tag responses to determine when activation is appropriate. The control unit receives feedback about the reading process status and adjusts repeater activation accordingly, balancing rapid response with interference avoidance through protocol-aware timing.
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 portable RF repeater improves the read rate of RFID tags by relaying data and synchronizing signals, reducing interference and ensuring complete data collection from all tags, even in challenging environments, by activating only when needed and conserving energy by switching to a sleep mode.
Implementation Method 1
the control unit is configured to receive an RFID signal from the antenna, convert the RFID signal into a converted REID signal, and transmit the converted RFID signal to the antenna to relay the result to the reader system
Implementation Method 2
the control unit is configured to detect an interrogation signal from the antenna and not to transmit any converted RFID signal to the antenna
Data Source
AI summary
A portable radio-frequency repeater includes a housing and a transceiver. The transceiver is disposed at least partially within the housing and configured to alternatively operate in a transmitting mode and a sleep mode. The transceiver includes an antenna and a control unit. The control unit is in electrical communication with the antenna. When the transceiver operates in the transmitting mode, the control unit is configured to receive an RFID signal from the antenna, convert the RFID signal into a converted RFID signal, and transmit the converted RFD signal to the antenna. When the transceiver operates in the sleep mode, the control unit is configured to detect an interrogation signal from the antenna and not to transmit any converted RFID signal to the antenna.