RFID Booster Modules for Accurate Large-Area Tag Reading
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Solution Overview
Problem
Existing RFID systems face challenges in accurately and cost-effectively managing real-time inventory of static articles in large storage areas due to prohibitive costs and mutual jamming issues when scaling with multiple readers and antennas.
Innovation Solution
The system incorporates booster modules with power amplifiers and antennas connected to existing RFID readers, allowing for increased transmitting and reading antennas through multiplexed signal transmission on a single cable, reducing complexity and installation costs while improving read sensitivity and location accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple RFID readers and antennas are deployed to manage inventory in large storage areas, then the inventory management capability is improved, but the system cost increases prohibitively and mutual jamming occurs
Solution Approach 1:
The booster module enables a single RFID reader to serve multiple antennas simultaneously, making the reader multi-functional. The reader can interrogate tags through different antennas at different power levels without requiring additional readers, thus improving inventory management capability while avoiding the cost of deploying multiple independent readers.
Solution Approach 2:
The booster module acts as an intermediary between the RFID reader and multiple antennas. It receives a single RFID signal from one reader, amplifies it, and distributes it to multiple antennas, thereby enabling one reader to control multiple antennas without direct connection to each antenna, reducing system complexity and cost.
2Area of stationary object
If multiple RFID readers are deployed in close proximity to cover large areas, then the coverage area is improved, but mutual jamming between readers occurs
Solution Approach 1:
The system segments the coverage area by assigning different antennas to different spatial zones while using a single reader. The controller selectively activates specific antennas based on the location of tags to be interrogated, thereby covering large areas without having multiple readers operating simultaneously in close proximity, which prevents mutual jamming.
Solution Approach 2:
The system dynamically selects which antennas to activate based on real-time requirements. The controller can switch between different antenna configurations and power levels depending on the location and density of tags, allowing flexible coverage adjustment without the interference that would occur with fixed multiple-reader deployments.
3Device complexity
If a single cable is used to transmit multiplexed signals to booster modules, then the installation complexity is reduced, but signal interference may occur
Solution Approach 1:
The system uses time-division multiplexing where control signals and RFID signals are transmitted periodically in alternating time slots through the same cable. The booster module switches between receiving control signals from the controller and receiving RFID signals from the reader, thereby reducing signal interference while maintaining installation simplicity.
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 approach enhances read performance, location accuracy, and flexibility by increasing the number of transmitting spots and using different frequency bands, reducing destructive interference, and improving inventory management in shielded environments.
Implementation Method 1
a power amplifier configured to amplify at least a reduced power portion of the received RFID signal
Implementation Method 2
at least one booster antenna configured to emit the amplified RFID signal
Data Source
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AI summary
A system (10) for cost-effective and accurate reading of RFID tags (12) is provided. The system includes an RFID reader (14) and one or more booster modules (18) connected to the RFID reader (14). Each booster module (18) has its own power supply, allowing for an amplification of a portion of the RFID signal (16) that is output by the RFID reader (14). Thereby, the total power output of the system (10) can be increased, and a read range and read accuracy can be improved due to additional antennas provided in the booster modules (18). In addition, it also becomes possible to reduce the power output by the RFID reader (14) in order to increase the read accuracy of the same.