Development of a Flexible Surface Wetness Sensor Using RFID Technique
Date Issued
2006
Date
2006
Author(s)
Wang, Bo-Yan
DOI
en-US
Abstract
The present study develops a flexible sensor for detecting surface wetness and the sensor transmits the information of RF signal based on RFID technique. The operation frequency of the RFID system is at 13.56MHz.
The MEMS process was employed to fabricate the antenna and the sensor of RFID tag on FPCB. The shape of the RFID tag’s antenna is designed as octangle that surrounds a comb shape sensor. The transmitting information of the RFIC is changed as the surface condition of sensor changed from dry to wet and it can be observed on the screen of the digital oscilloscope.
The simulations of the equivalent circuits of the RFID tag and of the S-parameter are also obtained in this study. The simulation results show the operation voltage of the RFIC, the quality factor (Q-factor) and the resonant frequency of the RFID system.
The RFID tag’s antenna has an outer diameter of 2.7 cm and the quality factor of the RFID tag has a value of 10.05. The tag and the reader of RFID system are communicated through inductive coupling and the maximum transmitting range of the RF signal is about 15 cm
Subjects
可撓性感測器
表面濕潤感測器
射頻身分識別
被動式標籤
電感耦合
13.56MHz
軟性印刷電路板
flexible sensor
surface wetness
RFID
passive tag
inductive coupling
13.56 MHz
FPCB
Type
thesis
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