An ultra-high frequency RFID tag antenna with a variable capacitance tuning mechanism
By using a variable capacitor tuning mechanism and a Kalman filter algorithm, frequency adaptive tuning of RFID tag antennas in complex environments was achieved, solving the impedance mismatch problem and improving the adaptability and performance of the tags.
CN122113977APending Publication Date: 2026-05-29RICE MICROELECTRONICS
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- RICE MICROELECTRONICS
- Filing Date
- 2026-02-06
- Publication Date
- 2026-05-29
AI Technical Summary
Technical Problem
Existing RFID tags have difficulty dynamically adjusting their resonant frequency when the environment changes, leading to impedance mismatch, which affects reading distance and communication stability, and increases chip area and cost.
Method used
A variable capacitor tuning mechanism is adopted, which uses a capacitance sensor to detect the capacitance value in real time. Combined with Kalman filtering algorithm and adaptive algorithm, the inductor and variable capacitor are dynamically adjusted to ensure impedance matching between the tag antenna and the chip.
Benefits of technology
This reduces chip design complexity and cost, improves the tag's adaptability and performance in different environments, and ensures communication stability and reading distance.
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Smart Images
Figure CN122113977A_ABST
Abstract
The application discloses a kind of ultra-high frequency RFID label antenna with variable capacitance tuning mechanism, it is related to label antenna technical field, including: antenna body;Label chip, for the moderate effect of radio frequency circuit and the capacitive input impedance of label chip form resonant circuit;Variable capacitance, for tuning antenna frequency, and utilize the characteristic of high resistance low of isolation direct through, optimize high frequency signal transmission;Capacitance detection sensor, for real-time detection variable capacitance initial value and data feedback to controller, as the starting point of automatic tuning;Inductor, for adjusting loop current, to realize resonant frequency dynamic adjustment;Current detection sensor, for detecting the size of loop current;Controller, for dynamic processing to detection data, converge to optimal capacitance value, to adapt to frequency drift in complex electromagnetic environment, ensure that label stable work.The application simplifies chip capacitance array and control circuit design, keeps chip area unchanged, realizes cost saving.
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