Person: Ghodgaonkar, Deepak
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Name
Deepak Ghodgaonkar
Job Title
Adjunct Faculty
Email Address
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079-68261623
Birth Date
Specialization
RF and Microwave Engineering, Microwave Nondestructive Testing of Composite Materials, Biomedical Applications of Microwaves, Electromagnetic Imaging of Complex Dielectric Bodies, Microwave Measurements and Characterization of Nonlinear Dielectric Materials such as Barium-Strontium Titanate
Meet Professor Deepak Ghodgaonkar has been a distinguished faculty member
Abstract
Biography
Dr. Ghodgaonkar specialize in research areas of microwave nondestructive testing of composite materials and microwave imaging of human body. He has published more than 140 papers in reputed journal and conference proceedings. He supervised thesis work 4 PhD students and many MTech/BTech students. Also, he is a professor involved in teaching and research in areas of applied electromagnetics for more than 30 years. He has organized more than 14 international conferences. He is Senior Member IEEE, Fellow IETE and Fellow IEM, Malaysia.
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18 results
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Now showing 1 - 10 of 18
Publication Metadata only Breast Image Reconstruction and Cancer Detection Using Microwave Imaging(IOP Publishing, Bristol, UK, 2022-12-01) Patel, Hardik N; Ghodgaonkar, Deepak; Suri, Jasjit SPublication Metadata only Miniaturized Tri-band Circularly Polarized Staired Rectangular Dielectric Resonator Antenna for Navigation Satellite Applications(EBSCO, 01-01-2022) Chaudhary, Pankaj; Gupta, Sanjeev; Jyoti, Rajeev; Mahajan, M B; Ghodgaonkar, Deepak; DA-IICT, Gandhinagar; Chaudhary, Pankaj (201521001)Publication Metadata only Flexible solid state power amplifiers for space use(IJMOT, 01-03-2015) Doshi, R J; Singh, D K; Das, D K; Ghodgaonkar, Deepak; Ghodgaonkar, Deepak; DA-IICT, GandhinagarAutomatic Speaker Recognition (ASR) is an economic tool for voice biometrics because of availability of low cost and powerful processors. For an ASR system to be successful in practical environments, it must have�high mimic resistance, i.e., the system should not be defeated by determined mimics which may be either identical twins or professional mimics. In this paper, we demonstrate the effectiveness of Linear Prediction (LP)-based features, viz., Linear Prediction Coefficients (LPC) and Linear Prediction Cepstral Coefficients (LPCC) over filterbank-based features such as Mel-Frequency Cepstral Coefficients (MFCC) and newly proposed Teager energy-based MFCC (T-MFCC) for the identification of professional mimics in Indian languages. Results are reported for real and fictitious experiments. On the whole, it is observed that LP-based features perform�better�than filterbank-based features (an average jump of 23.21% and 31.43% for fictitious experiments with professional mimic in Marathi and Hindi, respectively, whereas there is an average jump of 1.64% for real experiments with professional mimic in Hindi) and�we believe that this is the first time such results on identification of professional mimics in ASR are obtained. Analysis of the results is given with the help of Mean Square Error (MSE) between training and testing utterances for mimic�s imitations for target speakers and target speakers� normal voice. Fourier spectra and corresponding LP spectra for target speaker and its impersonations provided by professional mimic are shown to justify the results. Finally, dependence of LPC on physiological characteristics of vocal tract and its relation with respect to the problem addressed in this paper is studied.Publication Metadata only Dielectric resonator antenna as a RFID tag for human identification system in wrist watch(Sciendo, 03-01-2013) Makwana, Gautam; Ghodgaonkar, Deepak; DA-IICT, Gandhinagar; Makwana, Gautam D (201021005)Radio Frequency Identification (RFID) has been considered as a time and money-saving solution for a wide variety of applications, such as manufacturing, supply chain management, and inventory control. However, there is a growing need in the RFID community to research and find out the tag with miniature, circular polarized radiation patterns, dual band operation, high radiation efficiency and high bandwidth operations. This paper presents compact radio frequency identification (RFID) tag for human identification system in wrist watch. Dielectric resonator antenna (DRA) with patch is used as an active tag. The proposed antenna is operated on dual frequency bands. Simple microstrip line is used as a feeding mechanism. It is operated at 2.4 GHz and 5.8 GHz frequency band. It has circular polarization radiation patterns. Simulation results are presented on various parametric studies on the RFID tag.Publication Metadata only Investigation on Dielectric Properties of Sludge Waste from Water Treatment Using Microwave Non-Destructive Testing (MNDT)(Universiti Tun Hussein Onn Malaysia (UTHM), 15-08-2023) Zable, M A H; Khan, Z Ismail; Zakaria1, N A; Rashid, N E Abd; Khan, N Ismai; Mahmood, M K A; Ghodgaonkar, Deepak; Ghodgaonkar, Deepak; DA-IICT, GandhinagarThe demand for water cleanup rises in tandem with a country's requirements and development. Recovery of purified water containing nutrients and other beneficial materials is a critical opportunity that must be taken advantage of. A challenge that needs to be tackled is the necessity for large capacity and high-value management of sludge waste following the water treatment process. The pH level and microwave frequencies influence were used as a starting point for assessing the content of the sludge waste. Microwavenon-destructive testing (MNDT) is a microwave measurement that can be used to determine the dielectric characteristics of materials without destroying or modifying the sample's content. The methodology employs a free-space measurement technique with a frequency range of 8 to 12 GHz (X-band). Through S-parameters acquired, a correlation analysis was done to analyze the effect of frequencies with the sludge waste. A comparative investigation with peat soil samples in establishing if the sludge has similar attributes to normal soil is used to ensure the accuracy of the sludge waste data. It can be determined that the sludge waste has a high signal correlation towards the frequency band 8 GHz to 12 GHz, which is compatible with the MNDT approach. All of the sludge samples had a pH range that is appropriate for agricultural usePublication Metadata only Characterization of hydroxypropylmethylcellulose films using microwave non-destructive testing technique(Elsevier, 17-01-2007) Anuar, Nor Khaizan; Wui, Wong Tin; Taib, Mohd Nasir; Ghodgaonkar, Deepak; Ghodgaonkar, Deepak; DA-IICT, GandhinagarThe applicability of microwave non-destructive testing (NDT) technique in characterization of matrix property of pharmaceutical films was investigated. Hydroxypropylmethylcellulose and loratadine were selected as model matrix polymer and drug, respectively. Both blank and drug loaded hydroxypropylmethylcellulose films were prepared using the solvent-evaporation method and were conditioned at the relative humidity of 25, 50 and 75% prior to physicochemical characterization using microwave NDT technique as well as ultraviolet spectrophotometry, differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR) techniques. The results indicated that blank hydroxypropylmethylcellulose film exhibited a greater propensity of polymer�polymer interaction at the O�H and C�H domains of the polymer chains upon conditioned at a lower level of relative humidity. In the case of loratadine loaded films, a greater propensity of polymer�polymer and/or drug�polymer interaction via the O�H moiety was mediated in samples conditioned at the lower level of relative humidity, and via the C�H moiety when 50% relative humidity was selected as the condition for sample storage. Apparently, the absorption and transmission characteristics of both blank and drug loaded films for microwave varied with the state of polymer�polymer and/or drug�polymer interaction involving the O�H and C�H moieties. The measurement of microwave NDT test at 8 GHz was sensitive to the chemical environment involving O�H moiety while it was greatly governed by the C�H moiety in test conducted at a higher frequency band of microwave. Similar observation was obtained with respect to the profiles of microwave NDT measurements against the state of polymer�polymer and/or drug�polymer interaction of hydroxypropylmethylcellulose films containing chlorpheniramine maleate. The microwave NDT measurement is potentially suitable for use as an apparent indicator of the state of polymer�polymer and drug�polymer interaction of the matrix.Publication Metadata only Wideband stacked rectangular dielectric resonator antenna at 5.2 GHz(01-02-2012) Makwana, Gautam D; Ghodgaonkar, Deepak; DA-IICT, Gandhinagar; Makwana, Gautam D (201021005)This paper presents a design of stacked rectangular dielectric resonator antenna (RDRA) with wide bandwidth, in the range of 13.56 % is described. The antenna exploits two low-Q modes with overlapping bandwidths to achieve a wide continuous bandwidth. This is achieved using low-permittivity DRA volume placed on high permittivity DRA volume. The antenna consists of dielectric constant of 10 and 32, stacked vertically to obtain improved bandwidth as compared to the conventional RDRA. A 50 ? microstrip line is used in the proposed antenna as a feeding mechanism. Physical parameters of stacked RDRA have been optimized by extensive simulations using Ansoft HFSS. The parameters of antenna are 17x7x4.56 mm3 with grounded substrate size: 80x50 mm2. The prototype is fabricated. Measured and simulated results are both in good agreement. The prototype antenna designed to operate in band from 5.0 to 5.7 GHz with measured gain at 5.2 GHz resonant frequency. The proposed antenna is suitable for wireless local area networks (WLAN) applications in 5 GHz frequency band (in the frequency range 5.15-5.35 GHz and 5.5-5.7 GHz). This stacked RDRA exceeds the bandwidth requirements for IEEE 802.11a WLAN applications within a required VSWR. Parametric studies of the stacked DRA are presented.Publication Metadata only GaAs MMIC Low Noise Amplifier With Integrated High-Power Absorptive Receive Protection Switch(IEEE, 01-12-2018) Rao, Ch V N; Sharma, Nitesh; Ghodgaonkar, Deepak; DA-IICT, GandhinagarThis letter reports a GaAs monolithic microwave integrated circuit (MMIC) low noise amplifier (LNA) with integrated high-power absorptive receive protection switch realized using 0.13-�?m�GaAs pHEMT process. On-the-chip current distributed, resonant shunt FET switch configuration is employed for higher power handling. FET stacking technique is used to reduce the effective noise figure (NF). A two-stage LNA with integrated high power switch, forming each arm in a balanced configuration is employed to realize a monolithic LNA with integrated absorptive receive protection switch. This novel MMIC provides protection up to 20-W continuous wave and 2.9-dB NF, a gain of 20 dB over 9.3�9.9 GHz.Publication Metadata only Microwave non-destructive testing technique for characterization of HPMC-PEG 3000 films(Elsevier, 01-10-2007) Wui, Wong Tin; Ghodgaonkar, Deepak; Taib, Mohd Nasir; Anuar, Nor Khaizan; DA-IICT, GandhinagarThe capacity of microwave non-destructive testing (NDT) technique to characterize the matrix property of binary�polymeric films�for use as�transdermal�drug delivery system�was investigated.�Hydroxypropylmethylcellulose�(HPMC) and�polyethylene glycol�(PEG) 3000 were the choice of�polymeric matrix�and�plasticizer, respectively with�loratadine�as the model drug. Both blank and drug loaded HPMC-PEG 3000 films were prepared using the solvent-evaporation method. These films were conditioned at the�relative humidity�of 25, 50 and 75% prior to�physicochemical characterization�using the established methods of ultra-violet�spectrophotometry,�differential scanning calorimetry�and�Fourier transform infrared spectroscopy�methods, as well as, novel microwave NDT technique. Blank films exhibited a greater propensity of polymer�polymer interaction at the O�H domain upon storage at a lower level of�relative humidity, whereas drug loaded films exhibited a greater propensity of polymer�polymer, polymer�plasticizer and/or drug�polymer interaction via the O�H, C�H and/or aromatic Cdouble bondC functional groups when they were stored at a lower or moderate level of relative humidity. The absorption and transmission characteristics of both blank and drug loaded films for microwave varied with the state of polymer�polymer, polymer�plasticizer, and/or drug�polymer interaction of the matrix. The measurements of microwave NDT test at 8 and 12�GHz were sensitive to the polar fraction of film involving functional group such as O�H moiety and the less polar environment of matrix consisting of functional groups such as C�H and aromatic Cdouble bondC moieties. The state of interaction between polymer,�plasticizer�and/or drug of a binary polymeric film can be elucidated through its absorption and transmission profiles of microwave.Publication Metadata only Improving the efficiency of solid-state power amplifier by frequency switching for satellite communication(WILEY, 01-11-2018) Doshi, R J; Ghodgaonkar, Deepak; Ghodgaonkar, Deepak; DA-IICT, GandhinagarThis paper presents a technique to make the solid-state power amplifier (SSPA) flexible (adaptive) in terms of frequency for space segment of satellite communication. As compared with the present fixed (static) performance SSPA, the flexible frequency SSPA allows the users to keep themselves updated with the changing scenario of satellite communication. The flexibility can be achieved by using PIN diode for high frequency amplifiers and varactor diode for low frequency amplifiers as switch. The bias voltage of the diode can be changed remotely by means of telecommandable circuit. The gallium nitride�based SSPAs using this concept will be able to compete the travelling wave tube amplifier for onboard applications. It also demonstrates the circuit topology for selecting the required narrow frequency band rather than designing broadband SSPA resulting in improvement of efficiency and device's channel temperature. Improvement of channel temperature in space application improves the reliability of active devices.