BITS Faculty Publications
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Item Performance Analysis of Dielectric Resonator Antennas(Springer, 2013-09) Gupta, NavneetCompact, lightweight and low cost electronics components are attracting much attention because of the rapid growth of the wireless communication systems. The antenna designers are thus in continuous search for new advanced design of miniaturized antennas. One solution is to use a dielectric resonator antenna (DRA) which provides various benefits in terms of the performance. This paper presents fundamental concepts, theory and review study carried out on DRAs. The achievable performance of DRAs designed for wide impedance bandwidth, low profiles, circular polarization, compactness, and high gain are illustrated. The latest techniques for improving the results are also covered.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.Item Linearly polarized asymmetric dielectric resonator antenna for 5.2-GHz WLAN applications(Taylor & Francis, 2015-05) Gupta, NavneetA rectangular shape of asymmetric dielectric resonator antenna (DRA) excited by a coaxial probe is proposed and investigated. The asymmetric DRA geometry can offer an impedance bandwidth up to 51% for |S11| < −10 dB from 4.1 to 6.7 GHz. The antenna covers most of the wireless systems like 5.2, 5.5, and 5.8 GHz WLAN/Wi-MAX applications. The experimentally measured result shows that the efficiency is above 90% for the bandwidth of operation. The simulated and measured radiation patterns are consistent throughout the operational bandwidth. The measured peak gain over the band is 8.2 dBi. It is also observed that the newly proposed configuration reduces the DRA volume by 26% as compared to conventional rectangular DRA, with compact volume of 8.24 cm3. Good match between the measured and simulated results has been obtained.Item A novel tetraskelion dielectric resonator antenna for wideband applications(Wiley, 2015-09) Gupta, NavneetA novel tetraskelion dielectric resonator antenna (DRA) excited by a coaxial probe is investigated for wideband applications. The material used for investigation is Rogers TMM10i, which is a ceramic thermoset polymer composite material having a dielectric constant ( urn:x-wiley:08952477:media:mop29450:mop29450-math-0001) of 9.8. The proposed geometry offers a wideband of 57.5% for an impedance bandwidth for |S11| < −10 dB from 3.85 to 6.96 GHz. The antenna covers most of the wireless systems like C-band, WLAN, and Wi-MAX applications. The experimentally measured results show the efficiency of 90% for the operational bandwidth and peak gain of 4.1 dBi at 5.25 GHz. It is also observed that the new proposed configuration reduces the DRA volume by 52% as compared with conventional rectangular DRA; with reduced volume of 6.48 cm3. The simulated and experimental results are well in agreement. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2781–2786, 2015Item An Eco-Design of Dielectric Resonator Antenna for Wideband Applications(SSRN, 2016-02) Gupta, NavneetA systematic study on an eco-design of Dielectric Resonator Antenna (DRA) is done for the first time by considering the environment. The developed DRA is an eco-designed antenna which uses less material and energy; due to this the environmental impact is reduced. The proposed DRA geometry decreases the DRA dielectric material by 52% as compared to conventional rectangular DRA with compact volume of 6.48 cm3. The antenna covers most of the wireless system like 5.2 and 5.8 GHz WLAN/Wi-MAX applications.