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http://dx.doi.org/10.12673/jant.2020.24.6.627

Humidity Sensor Using Microwave Sensor Based on Microstrip Defected Ground Structure Coated with Polyvinyl Alcohol  

Yeo, Junho (School of ICT Convergence, Daegu University)
Kwon, Younghwan (Department of Chemical Engineering, Daegu University)
Publication Information
Journal of Advanced Navigation Technology / v.24, no.6, 2020 , pp. 627-632 More about this Journal
Abstract
In this paper, we have studied a development of a humidity sensor using a microwave sensor based on a microstrip defected ground structure coated with polyvinyl alcohol. A high-sensitivity microwave sensor, which is sensitive to the changes in the permittivity of the material under test, is designed by adding an interdigital capacitor-shaped defected ground structure to the ground plane of a microstrip line. Polyvinyl alcohol, a polymer material whose permittivity varies depending on humidity, is coated with a thin thickness on the defected ground structure of the proposed microwave sensor, and the changes in the resonance frequency and magnitude of the transmission coefficient for the microwave sensor according to humidity are measured. When relative humidity increases from 40% to 80% in 10% increments at a temperature of 25 degrees using a temperature/humidity chamber, the resonant frequency of the transmission coefficient decreases from 1.475 GHz to 1.449 GHz, and the magnitude is increased from -32.90 dB to -25.67 dB.
Keywords
Polyvinyl alcohol(PVA); Humidity sensor; Defected ground structure; Interdigital capacitor- shaped; Microstrip line;
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