RFID Resonant Circuit Tuning for Longer-Range Tag Reading
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Solution Overview
Problem
Current RFID tag readers at low frequency have limited reading distance and poor anti-interference ability due to fixed parameters and inability to adjust transmission power, requiring close proximity for effective data retrieval.
Innovation Solution
An RFID tag information reading apparatus and method that adjusts capacitance and inductance values in a resonant circuit to generate resonance, generates a sine wave signal, and releases direct current components to enhance transmission power and stability, using discrete electronic components and a DC release circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If integrated chips are used to complete electromagnetic wave transmission and data decoding, then the device structure is simplified, but the parameters cannot be adjusted and transmission power cannot be improved
Solution Approach 1:
The patent divides the RFID reader into separate functional modules: an electromagnetic wave transmission module with adjustable parameters and a data decoding module. This segmentation allows independent optimization of each module, enabling parameter adjustment without requiring complete integration, thus resolving the contradiction between device simplification and parameter adaptability.
Solution Approach 2:
The patent introduces dynamic parameter adjustment capabilities in the electromagnetic wave transmission module, allowing transmission frequency and power to be adjusted in real-time. This dynamic characteristic enables the system to adapt to different reading distances and interference conditions while maintaining a relatively simple overall structure.
2Reliability
If the reader is attached close to the tag, then reading reliability is improved, but the reading distance is limited
Solution Approach 1:
The patent employs parameter changes in the resonant circuit, specifically adjusting capacitance values to achieve resonance at different frequencies. By tuning the resonant frequency and quality factor (Q-value) of the circuit, the electromagnetic wave transmission efficiency is optimized, enabling reliable reading at extended distances without requiring physical proximity between reader and tag.
Solution Approach 2:
The patent utilizes periodic electromagnetic wave transmission through resonant oscillation. The resonant circuit generates sustained periodic oscillations at the operating frequency, which enhances the effective transmission distance while maintaining signal integrity and reading reliability compared to non-resonant continuous transmission.
3Device complexity
If fixed frequency transmission is used, then the system is simple, but anti-interference ability is poor
Solution Approach 1:
The patent implements dynamic frequency adjustment capability in the electromagnetic wave transmission module. The system can automatically or manually adjust the transmission frequency to avoid interference from other devices operating at fixed frequencies. This dynamic frequency selection enhances anti-interference ability while adding minimal complexity to the overall system.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the quality of received signals and the operating environment. Based on this feedback, the system automatically adjusts transmission parameters including frequency and power levels to optimize performance and avoid interference, thereby improving anti-interference ability with controlled system complexity.
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
Improves reading distance and anti-interference ability by generating high-energy electromagnetic waves, allowing reading without close proximity and enhancing system stability.
Implementation Method 1
adjust a capacitance value of the resonant circuit according to the operation frequency signal, so that the resonant circuit generates a resonance for generating a sine wave signal at an operation frequency
Implementation Method 2
generate an electromagnetic wave from the sine wave signal, radiate the electromagnetic wave to an RFID tag
Data Source
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AI summary
Embodiments of the present invention relate to the field of radio frequency identification technology, and disclose an RFID tag information reading apparatus and method, including a signal management circuit, a resonant circuit and a decoding identification circuit; where the signal management circuit is connected with the resonant circuit, and the resonant circuit is connected with the decoding identification circuit; the signal management circuit is configured to output an operation frequency signal; the resonant circuit is configured to receive the operation frequency signal, adjust a capacitance value and an inductance value of the resonant circuit according to the operation frequency signal, so that the resonant circuit generates a resonance for generating a sine wave signal at a frequency point of the operation frequency signal, the resonant circuit is further configured to generate an electromagnetic wave from the sine wave signal, radiate the electromagnetic wave to a tag, and trigger the tag to return a tag identity signal; the decoding identification circuit is configured to identify tag information according to the tag identity signal returned by the tag. The tag reading apparatus in the embodiments of the present invention can generate a resonance by adjusting parameters of the resonant circuit, so as to enhance a transmission power and effectively improve a reading distance of a reader.