RFID Range Extender Using Separate Power Frequency
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Solution Overview
Problem
RFID systems face limitations in range due to legal output power restrictions, environmental interference, and the need for additional components, which can reduce the effective communication distance between RFID readers and transponders, especially in environments with metallic objects.
Innovation Solution
An RFID system with a range extender device that emits electromagnetic waves in a separate frequency range to provide additional power to RFID transponders, using a transmitter that operates independently or integrated into a secondary RFID reader, enhancing the communication range by supplying energy beyond legal limits and environmental interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the output power of the RFID reader is increased to extend the identification range, then the range is improved, but legal limitations prevent further power increase
Solution Approach 1:
The system segments the power supply function by introducing a separate range extender device that provides additional electromagnetic energy independently from the RFID reader. This allows the reader to operate within legal power limits while the extender supplements power in specific areas to extend identification range.
Solution Approach 2:
The range extender acts as an intermediary device between the RFID reader and transponders in distant or interference-affected areas. It receives control signals from the reader and transmits supplemental electromagnetic energy to enable transponder activation without requiring the reader to exceed legal power limits.
2Adaptability or versatility
If additional electronic components are added to the RFID transponder, then functionality is improved, but the minimum energy threshold increases making operation more difficult
Solution Approach 1:
The range extender performs preliminary power supply action by continuously or periodically emitting electromagnetic waves in the target area before the RFID reader attempts to communicate with transponders. This ensures that transponders with additional components receive sufficient energy in advance to be fully operational when queried.
Solution Approach 2:
The system changes the energy parameter distribution by introducing a dedicated power extension mechanism that increases the electromagnetic field strength in specific geographic areas. This allows transponders requiring higher minimum energy thresholds due to additional components to operate reliably without changing the reader's output parameters.
3Adaptability or versatility
If the RFID reader operates in environments with metallic objects, then real-world applicability is improved, but electromagnetic interference patterns create areas with very low field strength
Solution Approach 1:
The range extender implements local quality enhancement by directing supplemental electromagnetic energy specifically to areas affected by metallic interference. Rather than attempting to uniformly increase field strength everywhere, the system targets specific geographic zones where interference creates low field strength areas, maintaining reliability locally while preserving overall system adaptability.
4Use of energy by moving object
If a separate power source is added to the RFID transponder, then energy availability is improved, but device complexity and cost increase
Solution Approach 1:
The system implements self-service by having the range extender provide power to transponders in the extended area without requiring the transponders themselves to carry power sources. The transponders continue to operate as passive devices, harvesting energy from the electromagnetic waves emitted by the extender, thus avoiding the complexity and cost of integrated power sources while ensuring adequate energy availability.
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 system extends the RFID communication range, ensuring reliable operation of transponders with additional components, even in challenging environments, without requiring a battery-powered transponder, and reduces interference by using distinct frequency ranges for power supply and communication.
Implementation Method 1
a transmitter (215) for emitting electromagnetic waves (220) into a predefined target area (230)
Implementation Method 2
the signal received by the RFID reader serves, on the one hand, to supply the RFID transponder with energy
Data Source
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AI summary
A radio frequency identification (RFID) system comprises a primary RFID reader, an RFID transponder, and a range extender for the primary RFID reader, which includes a transmitter that emits electromagnetic waves into a predefined area. The RFID transponder is configured to receive the electromagnetic waves emitted by the range extender or its transmitter.