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Construction of a Wireless-Enabled Endoscopically Implantable Sensor for pH Monitoring with Zero-Bias Schottky Diode-based Receiver

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Humidity-Sensing Chipless RFID Tag with Enhanced Sensitivity Using an Interdigital Capacitor Structure.

Junho Yeo¹, Jong-Ig Lee², Younghwan Kwon³

¹School of ICT Convergence, Daegu University, 201 Daegudae-ro, Gyeongsan 38453, Gyeongbuk, Korea.

Sensors (Basel, Switzerland)

|October 13, 2021

Summary

This study introduces an eight-bit chipless radio frequency identification tag for humidity sensing. The interdigital capacitor (IDC) resonator shows enhanced sensitivity for humidity detection compared to electric-field-coupled inductor capacitor (ELC) resonators.

Keywords:

chipless radio frequency identification (RFID)humidity sensing interdigital capacitor (IDC) structure polyvinyl alcohol (PVA)radar cross-section (RCS)

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Area of Science:

Electrical Engineering
Materials Science
Sensor Technology

Background:

Chipless radio frequency identification (RFID) tags offer unique identification capabilities without integrated circuits.
Humidity sensors are crucial for environmental monitoring and industrial process control.
Integrating sensing functionalities into chipless RFID tags enhances their application potential.

Purpose of the Study:

To propose and characterize an eight-bit chipless RFID tag with integrated humidity sensing.
To investigate the design and performance of an interdigital capacitor (IDC) resonator for humidity detection.
To compare the humidity sensing performance of the IDC resonator with electric-field-coupled inductor capacitor (ELC) resonators.

Main Methods:

Design of a compact, high-sensitivity IDC resonator for humidity sensing.
Integration of seven ELC resonators for identification purposes in a 2x4 array.
Coating the IDC resonator with polyvinyl alcohol (PVA) for humidity interaction.
Experimental measurement of bistatic radar cross-section (RCS) in a controlled humidity environment (50-80% RH at 25°C).

Main Results:

The IDC resonator demonstrated higher sensitivity to relative humidity (RH) changes in both resonant peak frequency and RCS compared to ELC resonators.
Variations in RCS magnitude were significantly larger than resonant peak frequency shifts for both IDC and ELC resonators.
The PVA-coated IDC resonator's resonant frequency and RCS changed with humidity, while uncoated resonators remained unaffected.

Conclusions:

The proposed eight-bit chipless RFID tag effectively integrates humidity sensing using a PVA-coated IDC resonator.
The IDC resonator offers superior humidity sensing performance over ELC resonators in terms of sensitivity.
The study validates the potential of chipless RFID technology for developing advanced environmental sensing platforms.