Rfid humidity sensor, relative humidity detection method and system
By separating the radio frequency identification chip from the humidity-sensitive polymer in the RFID humidity sensor, and using the coupled tag antenna to sense humidity changes, a highly sensitive relative humidity detection is achieved, solving the problems of large size and poor detection sensitivity in existing technologies.
CN116297724BActive Publication Date: 2026-06-19SUZHOU UNIV
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SUZHOU UNIV
- Filing Date
- 2023-03-07
- Publication Date
- 2026-06-19
AI Technical Summary
Technical Problem
Existing RFID humidity sensors are large in size, have complex structures, and have poor detection sensitivity.
Method used
Design an RFID humidity sensor that uses a coupled tag antenna as a humidity sensing component and separates the RFID chip from the humidity-sensitive polymer. The coupled tag antenna senses changes in the relative humidity of the environment and transmits the information to the first tag antenna via electromagnetic field coupling, achieving high-sensitivity detection.
Benefits of technology
It achieves highly sensitive relative humidity detection, has a simple structure, low manufacturing cost, stable detection performance, and can measure ambient humidity over long distances.
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Smart Images
Figure CN116297724B_ABST
Abstract
This invention relates to an RFID humidity sensor, comprising a substrate, a first tag antenna, a radio frequency identification chip, a coupled tag antenna coupled to the first tag antenna and disposed on the upper surface of the substrate, a moisture-sensitive polymer, and a metal ground. The invention also relates to a relative humidity detection method based on the RFID humidity sensor, comprising placing the RFID humidity sensor in the environment to be measured; a reader emitting a radio frequency signal of a preset power, the coupled tag antenna receiving the radio frequency signal, and, based on the linear relationship between the dielectric constant of the moisture-sensitive polymer and the ambient humidity, changing the power of the radio frequency signal and transmitting it to the first tag antenna so that it returns to the reader; the reader acquiring a first reflected power; acquiring a second reflected power after the change in ambient humidity, obtaining the change in amplitude between the first reflected power and the second reflected power; and comparing with a pre-acquired linear relationship table between the change in reflected power amplitude and the change in ambient humidity to obtain the current ambient humidity.
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