BITS Faculty Publications
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Item Optimizing material choices for flexible pressure sensors driven by triboelectric nanogenerators(IEEE, 2025-04) Gupta, NavneetThis study shows the investigations on optimal dielectric material for self-powered flexible pressure sensors (SPFPSs) based on triboelectric nanogenerators (TENGs) using multiple criteria decision-making (MCDM) methods. Specifically, we utilized technique for order preference by similarity to ideal solution (TOPSIS) and VlseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR) techniques to identify potential dielectric materials. Several materials attributes, such as surface charge density, coefficient of friction, and dielectric constant, are examined to find out the best dielectric material. Through the TOPSIS and VIKOR ranking systems, we determined that polydimethylsiloxane (PDMS) is the most suitable dielectric material for TENG-based SPFPSs. The result presents a strong alignment across material selection methods and simulations that validates the robustness of our proposed outcomes.Item Dielectric material selection of microstrip patch antenna for wireless communication applications using Ashby's approach(Cambridge University Press, 2014-07) Gupta, Navneet; Kumar, RajneeshIn this paper, material selection has been done for dielectric substrate material in microstrip patch antenna (MPA) for three distinct classes of wireless communication applications using Ashby's approach. This material selection procedure is based on the creation and evaluation of Ashby's chart of different material indices. These material indices in turn affect the device performance indices, which decide the best possible dielectric material to be used as substrate for MPAs. In this work, quality factor, relative permittivity, and temperature coefficient of resonant frequency are chosen as material indices of MPA's dielectric substrate to get relevant performances. Ashby's selection chart shows that 0.75MgAl2O4–0.25TiO2 material for millimeter waves applications, Ca[(L1/3Nb2/3)0.85Ti0.15]O3−δ for mobile base station applications, and (Ba0.95Ca0.05)O–Sm2O3–4.5TiO2 ceramic for mobile phone miniaturization applications are the promising materials that allows best overall performance in MPAs for wireless communication.Item Investigation on microwave dielectric materials for dielectric resonator antennas(IOS, 2015) Gupta, NavneetIn this paper, a theoretical and practical investigation on microwave dielectric materials for wideband dielectric resonator antennas (DRAs) is presented. Due to the variety of materials available to antenna designers, a proper technique to select the best possible material is required. In this paper Ashby's material selection methodology is used for dielectric material based antenna systems. Four primary performance indices, impedance bandwidth (BW), the size of the antenna (λ), radiation efficiency (η) and resonance frequency (f_{0}), are used to obtain the desired performance. The selection chart shows that Roger TMM10, (ε_{r}= 9.8) is the most suitable material followed by "Roger's TMM10i and RO3010" for DRAs to provide the best performance for wideband applications. Performances of antenna are verified with rectangular and hybrid design of DRA in terms of reflection coefficients, radiation pattern, gain and efficiency. Theoretical work is compared with the simulation and the close agreement between the two, confirm the validity of this study.