Faculty Publications
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Publications by NITK Faculty
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Item Graphene-Oxide-Coated Flexible Fabric Antenna Sensor for Contact-Free H2O Sensing(Institute of Electrical and Electronics Engineers Inc., 2024) Singh, V.P.; Kandasamy, K.; Rahman, M.R.This article presents a flexible antenna sensor on denim jeans fabric for H2O sensing. A small defected ground structure is developed on the copper ground plane of the antenna. Graphene oxide (GO) is coated on the defected ground for sensor applications. The flexible antenna sensor with GO coated on a defected ground plane resonates at 5.52 GHz. The resonance frequency of the proposed antenna changes linearly with the H2O content. The frequency sensitivity of the denim fabric antenna sensor is ≈203 MHz/10% relative humidity (RH). The denim fabric antenna sensor has a measured phase sensitivity of 40° per 10% RH. The flexible antenna sensor gives a linearity of 98.28%. The designed antenna sensor can distinguish between fresh and dried grapes by H2O detection. © 2001-2012 IEEE.Item A Flexible and Biodegradable Graphene Oxide Antenna Sensor for Monitoring Subsoil Health(American Chemical Society, 2024) Singh, V.P.; Kandasamy, K.; Rahman, M.R.In this paper, a flexible graphene oxide-based antenna sensor is designed on the biodegradable substrate. It resonates at a frequency of 3.92 GHz. The flexible sensor is used in assessing water content in sandy loam subsoil near the Arabian Sea from the Western Ghats in India. The volumetric water content (VWC) of dry soil varies between approximately 0.06 VWC m3 m-3 to 0.7 VWC m3 m-3. The antenna sensor exhibits a linearity of 92.02% and a sensitivity of 402.6 MHz/VWC(m3 m-3). The limit of detection (LOD) and limit of quantification (LOQ) of the antenna sensor are 0.75 VWC and 2.5 VWC m3 m-3. The sensor is beneficial for examining soil water to enhance crop productivity for precision agriculture. © 2024 American Chemical Society.Item Graphene Oxide Assisted Humidity Sensing Antenna Sensor(Korean Institute of Electrical and Electronic Material Engineers, 2025) Singh, V.P.; Kandasamy, K.; Rahman, M.R.Abstract: In this paper, a graphene oxide (GO) coated substrate material is electrically characterized. The permittivity, loss tangent, permeability, and resistance are measured. A planar antenna with slots is designed on an RT/Duroid 5880 substrate. A thin layer of graphene oxide is coated on the identical slots of the planar antenna. The GO-assisted antenna sensor resonates at 2.51 GHz frequency. The graphene oxide-based antenna sensor performs contact-free sensing of relative humidity. The frequency sensitivity is approximately 17.5 MHz/10%RH. The design sensor gives a 93.50% linearity. The limit of detection is 30.55 RH%. Graphic Abstract: (Figure presented.) © The Korean Institute of Electrical and Electronic Material Engineers 2024.