Faculty Publications

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Publications by NITK Faculty

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Author: search.filters.author.Rao, P.H.Has files: No

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    Study of 2D localization using SIMO antenna
    (Institute of Electrical and Electronics Engineers Inc., 2016) Laddha, P.; Prasad, R.; Shripathi Acharya, U.S.; Srihari, P.; Prasad, S.; Rao, P.H.
    A single input and multiple output (SIMO) antenna configuration is presented for real time data acquisition. The proposed approach can provide both range and angle information in a plane. A method of localization of multiple point objects (targets) in azimuthal plane is realized by employing one stationary transmitting antenna and dynamic receiving antennas positions. FMCW chirp signals are used as transmitting signals. A parametric analysis is carried out by varying the bandwidth of transmitted signal, number of samples and number of antennas on a linear array with equal inter-element spacing. Radial resolution of 0.4 feet and 0.23 feet is achieved for 2GHz and 6 GHz bandwidths respectively. The method is extended to identify multiple targets. © 2016 IEEE.
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    Analysis of series-fed microstrip array antennas
    (Presses Polytechniques Et Universitaires Romandes, 2016) Faisalbin Abdulmajeed, N.; Shet, N.S.V.; Rao, P.H.
    Series-fed array of square patches designed at 10 GHz, with three different configurations has been analyzed for sidelobe level and cross-polarization characteristics. A series-fed 8×2 planar array is analyzed to provide a sidelobe level of - 24.2dB and cross-polarization level of -21.8dB. The second configuration; a 2-line series array of 8 elements oriented back to back and fed with 180° out of phase exhibits a sidelobe level of - 25dB and low cross-polarization better than -51.6dB over all the angles. In the third configuration, a single line series array of 8 elements displaced on both the sides of the feed line is analyzed. The sidelobe level has been increased to -13.3dB with maximum cross-polarization level -27.7dB. The impedance bandwidth of 220MHz, 270MHz and 350MHz for a VSWR of 2, is observed for the three antenna types respectively. © 2016 IEEE.
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    3-D radar imaging using extended 2-D range migration technique
    (Institute of Electrical and Electronics Engineers Inc., 2017) Nagarad, S.R.; Sourabh, A.S.; Shripathi Acharya, U.S.; Srihari, P.; Prasad, S.; Rao, P.H.
    A three dimensional (3-D) imaging system is implemented by employing 2-D range migration algorithm (RMA) for frequency modulated continuous wave synthetic aperture radar (FMCW-SAR). The backscattered data of a 1-D synthetic aperture at specific altitudes are coherently integrated to form 2-D images. These 2-D images at different altitudes are stitched vertically to form a 3-D image. Numerical simulation for near-field scenario are also presented to validate the proposed algorithm. © 2017 IEEE.
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    A wideband dual polarized bow-tie antenna for 5G applications
    (Institute of Electrical and Electronics Engineers Inc., 2019) Bellary, B.; Kandasamy, K.; Rao, P.H.
    A wideband dual polarized bowtie antenna for 5G applications is presented. The dual polarization is achieved by using two different bow-tie antenna elements placed in orthogonal orientation. The design consists of rectangular slots on the two arms of bow-tie antennas which enhances the port to port isolation. The unidirectional radiation pattern is obtained by placing a perfect electric conductor (PEC) ground plane at λ/4 distance. The radiating elements are designed to operate at 3.5 GHz. Measured results of the proposed dual polarized bow-tie antenna exhibit a bandwidth of 42.85% (3.1 - 4.6 GHz) and 11.4% (3.3 - 3.7 GHz) for a VSWR of < 2 and 1.5 respectively. An isolation of 28dB between the two ports and an average gain of 8.4 dB is measured for both the polarizations. © 2019 IEEE.
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    Mitigation of mutual coupling in 2 X 2 dual slant polarized MIMO antennas using periodic array of SRRs loaded with transmission line for LTE band 40
    (John Wiley and Sons Inc, 2020) Bellary, A.; Kandasamy, K.; Rao, P.H.
    2 X 2 dual slant polarized multiple input multiple output (MIMO) antennas with reduced mutual coupling is presented for polarization and spatial diversity. The design of printed periodic array of split ring resonators (SRRs) loaded with horizontal strip transmission line is proposed to mitigate the mutual coupling among the MIMO antenna elements. An equivalent circuit model, characterizes the effect of coupling between the array of SRRs and the loaded transmission line, which together reduces the near field coupling between the adjacent antenna elements. The additional horizontal strip at the bottom is utilized to seek the return current path to the ground plane. Polarization and spatial diversity is achieved by utilizing dual slant 450 polarized antenna elements with eight independent channels. All four dual polarized antenna elements are designed to operate with a VSWR of <2 for (2.3-2.4 GHz) Band 40. Dual slant 450 polarization is achieved by utilizing two printed planar bow-tie antennas in orthogonal orientation. Measured and simulated results shows by incorporating periodic array of SRRs loaded with transmission line a considerable mutual coupling reduction of 25 to 50 dB is achieved in E-plane, H-plane, and D-plane over the required band 40. An isolation of 30 dB and an average gain of 7.5 dB is measured for dual slant 450 polarized antenna elements. MIMO performance metrics in terms of envelope correlation coefficient and diversity gain are also investigated. © 2020 Wiley Periodicals LLC
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    Analysis of Wave Propagation Models with Radio Network Planning Using Dual Polarized MIMO Antenna for 5G Base Station Applications
    (Institute of Electrical and Electronics Engineers Inc., 2022) Bellary, A.; Kandasamy, K.; Rao, P.H.
    Dual polarized printed multiple input multiple output (MIMO) antenna for Band 42 (3.4 - 3.6 GHz) with wave propagation models is presented. Polarization and spatial diversity are achieved by utilizing two printed bow-tie antennas in orthogonal orientation. The designed dual polarized antenna element with $2\times 2$ , $4\times 4$ and $8\times 8$ massive MIMO antenna configuration radiation patterns are deployed in selected geographical situation for detailed radio network planning using FEKO-WinProp platform. Knife edge diffraction, extended walfisch-ikegami and dominant path wave propagation models are implemented with designed MIMO antenna configurations. Modulation schemes of QPSK and QAM with corresponding data rates and throughput for all propagation models are presented. The signal strength and quality reflecting parameters reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), and signal to noise plus interference ratio (SNIR) are also evaluated for each model. From the simulation results dominant path model provides data rate and throughput of 3.827, 995 MBit/s and 3.577, 930.1 MBit/s for single stream of data in uplink and downlink respectively. The maximum data rate of 1.37 GBits/s is achieved for deployed base stations with $8\times 8$ massive MIMO antenna configuration effectively covering the entire geographical site. © 2013 IEEE.
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    Low-profile, wideband dual-polarized 1 × 2 MIMO antenna with FSS decoupling technique
    (Cambridge University Press, 2022) Bellary, B.; Kandasamy, K.; Rao, P.H.
    A low-profile, wideband dual-polarized 1 × 2 multiple-input-multiple-output (MIMO) antenna with frequency selective surface (FSS) decoupling technique is presented. Low profile is realized with two different artificial magnetic conductor (AMC) cells out of which one operates at 3.5 GHz and other with dual band at 3.1 and 4.5 GHz. The proposed antenna height is maintained at 0.125λ0 which is significantly reduced when compared with the conventional perfect electric conductor (PEC) ground plane. Wideband dual polarization is enabled by two pairs of bow-Tie antenna elements surrounded by a square ring placed in the orthogonal orientation. To mitigate the near-field coupling in 1 × 2 MIMO an FSS wall is constructed with wide band stop characteristics from 2.85 to 4.75 GHz. Measured results show by inserting FSS wall vertically, coupling reduction is improved by 27 dB over the existing coupling and the antenna exhibits a bandwidth of 57.14% (2.95-4.95 GHz) for VSWR<2 with port isolation of more than 25 dB for entire band of operation. © © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association.