Source: https://www.amrita.edu/faculty/dg-kurup
Timestamp: 2019-04-21 08:16:18+00:00

Document:
Dhanesh G. Kurup received his Bachelor’s and Master’s degree in Electronics and Communication Engineering from Calicut University and Indian Institute of Technology, Roorkee, Inda respectively. He further obtained Ph.D. degrees from Uppsala University, Sweden and University of Rennes 1, France. He was with Satellite Centre, Indian Space Research Organization (ISRO), Bangalore as a Scientist/Engineer for about two years and as a Guest Researcher with University of Rennes for about three years.
For about eight years Dr. Kurup directed research and subsequently as a consultant for about one year at Wavelogics AB, Sweden. In addition, he has teaching experience of over four years.
Dr. Kurup’s research interests includes active antennas, antenna arrays, computational electromagnetics, RF circuit design, Signal Processing and behavioral modeling of wireless systems.
RF sub-systems related to RFID, Radar or Communication systems.
Modeling and Performance simulation of Physical layer in Wireless systems.
RF circuits (PA, LNA, Oscillators) Antennas (active and passive), Antenna arrays.
Applied signal processing ( applying interesting algorithms/ tools to the above areas).
In this article, we present Vector Fitting Algorithm VFA to derive the rational function approximation model of Bandpass and Baseband systems in presence of Noise. The Root Mean Square Error RMSE and Identification error C scriptstyle p is calculated to analyze the modeling accuracy of VFA, for different orders of the system and for different SNR signal to noise ratio criteria. VFA is found to be more noise resilient with regard to system identification for higher order systems compared to lower order systems due to sharper frequency cut-off characteristics and corresponding noise suppression for higher order systems. It was also found that, for the same order and SNR, baseband systems have less modeling errors, when compared to bandpass systems.
K. Nishkala, B Toshitha Royan, H M Aishwarya, Sanjika Devi R V, and Dr. Dhanesh G. Kurup, “Detection of Ruptures in Pipeline Coatings using Split Ring Resonator Sensor”, in 7th IEEE International conference on Advances in Computing, Communications and Informatics (ICACCI), PES Institute of Technology, Bengaluru, South campus, India, 2018.
G. Narayanan and Dr. Dhanesh G. Kurup, “Detection of a real Sinusoid in noise using Differential evolution algorithm”, in Forth international Conference ICHSA, Gurgaon, 2018.
M. D. Perez, G. Thomas, Syaiful. S, J. Velander, N. Asan, P. Mathur, M. Nasir, D. Nowinski, Dr. Dhanesh G. Kurup, and R. Augustine, “BDAS: Preliminary Study on Microwave Sensor for Bone Healing Follow-up after Cranial Surgery in Newborns”, in 12th European Conference on Antenna and Propagation,London, (EuCap), UK, 2018.
Syaiful. S, J. Velander, P. Mathur, M. D. Perez, N. Asan, Dr. Dhanesh G. Kurup, T. Blokhuis, and R. Augustine, “Penetration Depth Evaluation of Split Ring Resonator sensor using In-Vivo Microwave Reflectivity and Ultrasound Measurements”, in 12th European Conference on Antenna and Propagation (EuCap), London, UK, 2018.
Vrinda K., N. S. Murty, and Dr. Dhanesh G. Kurup, “Rational function approximation of RF Passive Devices fpr Noisy Data”, in ICCSP, Chennai, 2018.
M. D. Perez, V. Mattson, S. R. M. Shah, Jacob Velander, Noor Badariah Asan, Parul Mathur, M. Nasir, Daniel Nowinski, Dr. Dhanesh G. Kurup, and R. Augustine, “New Approach for Clinical Data Analysis of Microwave Sensor Based Bone Healing Monitoring System in Craniosynostosis Treated Pediatric Patients”, in Conference on Antenna Measurement and Applications (CAMA), Sweden, 2018.
Vineetha K and Dr. Dhanesh G. Kurup, “Implementation of Artificial Neural Network on Raspberry Pi for Signal Processing Applications”, in ICACCI, India, 2018.
D. V. S. Srikar, K. C. Sairam, T. Srikanth, Gayathri Narayanan, Vrinda K, and Dr. Dhanesh G. Kurup, “Implementation and Testing of Cyber Physical System in Laboratory for Precision Agriculture”, in Sixth International Symposium on Intelligent Informatics (ISI’ Sep 2018), 2018.
Arawind K, Jalpa Shah, and Dr. Dhanesh G. Kurup, “Bit Error Rate (BER) Performance Analysis of DASH7 Protocol In Rayleigh Fading Channel”, in IEEE International conference on Computing, Communications and Informatics (ICACCI), Bangalore, 2018.
Aswini P Reghu, Sanjika Devi R V, Vrinda K, and Dr. Dhanesh G. Kurup, “Macromodeling of High Frequency Interconnects based on Accurate Delay Identification”, in IEEE International conference on Computing, Communications and Informatics (ICACCI), , Bangalore, 2018.
Shruthi N., Parul Mathur, and Dr. Dhanesh G. Kurup, “Performance of Ultra Wideband (UWB) pulsed Doppler Radar for heart rate and respiration rate monitoring in Noise”, in International Conference on Advances in Computing, Communications and Informatics (ICACCI), India, 2018.
Srinadh Reddy Bhavanam, Sanjika Devi R V, Sriram Mudulodu, and Dr. Dhanesh G. Kurup, “Information Criteria Based Optimal Structure Identification of RF Power Amplifier Models”, in International Symposium on Intelligent Systems Technologies and Applications (ISTA), Bangalore, 2018.
S. M. Bhat, S. Nikhil, Vineetha K. V, Sarada Jayan, and Dr. Dhanesh G. Kurup, “A Parallelized Method for Global Single Variable Optimization”, in Biennial International Conference on Power and Energy Systems: Towards Sustainable Energy (PESTSE), Amrita School of Engineering, Bengaluru, 2018.
R. V. S. Devi, B. M. Nandini, M. Niharika, P. Anush, and Dr. Dhanesh G. Kurup, “Broadband RF Power Amplifier Modeling using an Enhanced Wiener Model”, in International Conference on Computer, Communication and Informatics (ICCIC 2017, 2017.
R. V. S. Devi and Dr. Dhanesh G. Kurup, “Sparse Identification of Memory Effects and Nonlinear Dynamics for Developing Parsimonious Behavioral Models of RF Power Amplifiers”, in IEEE MTT-S International Microwave and RF Conference (IMARC), Ahmedabad, India, 2017.
V. S. Kumar and Dr. Dhanesh G. Kurup, “Design of Dielectric Rod Antenna for Ground Station Applications”, in International IEEE conference on Innovations in Antenna iAIM, India, 2017.
N. Saideep, Dr. Dhanesh G. Kurup, and Shikha Tripathi, “Detection of Closely Spaced Sinusoids in Noise using FastICA algorithm”, in Symposium on Recent Advances in Communication Theory, Information Theory, Antennas and Propagation(CIAP’17), Manipal University, Karnataka, India, 2017.
RF Power Amplifiers (PA) consumes a major part of available DC power in any wireless system. This article deals with behavioral modeling of RF Power Amplifiers using artificial neural networks. The developed model enables us to find energy consumption for a signal passing through the PA for a given Gain and maximum allowable distortion. The proposed modeling approach also enables us to linearize the PA by incorporating an inverse model of the PA in the baseband signal processor for compensating the distortion. The PA model can also be used as a sub-system model for evaluating the error performance of the overall system in terms of bit error rate (BER). The modeling method is validated for a class AB power amplifier design. © 2017 IEEE.
K. V. Vineetha and Dr. Dhanesh G. Kurup, “Direct demodulator for amplitude modulated signals using artificial neural network”, in 3rd International Symposium on Intelligent Systems Technologies and Applications (ISTA-2017), , Udupi, India, 2017.
This article deals with design parameters of open ended circular waveguide (OECW) for non-invasive monitoring of skull healing in pediatric craniosynostosis patients post cranial surgery. The surgery involves removal of one or a set of bone flaps from the patient's skull. The defect thus created is filled with bone dust and heals by itself over time but complications like non-unions could occur, thereby, necessitating regular monitoring of the healing process. In this article, results of the simulated interaction of the waveguide with the skull healing are presented. Extensive optimization process is performed to arrive at optimal design parameters of the waveguide. Frequency of operation and the material that fills the waveguide are investigated to improve the sensitivity of detection and enhance the monitoring of three different stages of cranial healing. © 2017 IEEE.
V. Sruthi, S. Krishnaveni, R.V. S. Devi, Vrinda K, Dr. Dhanesh G. Kurup, and V. Senthil Kumar, “Macromodeling of a dual polarized X band Microstrip-T Coupled Patch antenna”, in IEEE INDICON, IISc Bangalore , Bangalore , 2016.
Reshmi K and Dr. Dhanesh G. Kurup, “Implementation aspects of a new RFID anti-collision algorithm”, in IEEE Region 10 Conference TENCON, Singapore, 2016.
This paper presents the use of Quartic and Quintic order finite elements for computing cutoff wavenumbers of arbitrary shaped waveguides. These finite elements are used for mapping the boundaries of waveguides with the highest accuracy. In the case of waveguides with curve geometries, the mapping is done by quartic and quintic order parabolic arcs. The domain of a particular waveguide is transformed to a suitable isosceles triangle with the help of these finite elements. The above method is found to be highly computationally efficient as compared to other methods found in literature.
R. Augustine, Dr. Dhanesh G. Kurup, S. Raman, D. Lee, K. Kim, and A. Rydberg, “Bone Mineral Density Analysis using Ultra Wideband Microwave Measurements”, in IEEE International Microwave and RF Conference (ImaRC), Hyderabad, India, 2015.
R. Yesshaswi, A. Pratheik, Karthi S., Devi Sanjika, and Dr. Dhanesh G. Kurup, “Design and analysis of 6 watt GaN based X-band Power Amplifier”, in India Conference (INDICON-2015), 2015.
A. V. Menon, M. Amita, Anjali G, and Dr. Dhanesh G. Kurup, “Combined Amplitude and Phase Noise Effects in QAM Direct Conversion Receivers”, in International Conference on Microwave, Optical and Communication Engineering (ICMOCE), IIT-Bhuvaneshwar, 2015.
S. Avantika, S. K. Devika, V. Gomathy, S. Manjukrishna, Singh A. K., and Dr. Dhanesh G. Kurup, “Design and Experimental Characterization of a Bandpass Sampling Receiver”, in International Conference on Communication Systems, ICCS-2015, American Institute of Physics (AIP), Pilani, India, 2015.
RFID is an object identification and tracking technology worth several billion dollars today. Chipless technology doesn't require communication protocols and IC, making it cheaper. Passive RFID Tags use backscattering technique to send information to the Reader. In this paper, we present a passive RFID Tag based on Ultra-wide band technology. The chipless RFID tag modeled uses passive elements, namely antennas and transmission lines in different architectural orders by varying the lengths and the number of the transmission lines. The unique identities of the tags are characterized by the number and the lengths of the transmission lines and hence a large number of tags can be manufactured economically with a finite number of transmission lines. The technology involves transmission of nanosecond duration pulses which enables high precision time of arrival (TOA) estimation of signal. The software tool used to simulate this system is Linux based open source software development toolkit called GNURadio. It has a predefined set of signal processing blocks and has the provision to code user defined blocks and enables us to represent the RFID system using standard programming languages namely C++ and Python.
Navya K., N.U. Amrutha, Dr. Dhanesh G. Kurup, and Dr. Shikha Tripathi, “Time Series Analysis of Solar and Stellar Data using the S-Transform”, in ELSEVIER Proceedings of International Conferences on Advances in Signal Processing and Communication (SPC-2013), Lucknow, India, 2013.
Dr. Dhanesh G. Kurup, A. Rydberg, and M. Himdi, “Power combining using unequally spaced active reflect-array”, in Conference proceeding ANTENN-03, Kalmar, Sweden, 2003.
Dr. Dhanesh G. Kurup, A. Rydberg, and M. Himdi, “Active reflect-antennas for power combining unequally spaced arrays”, in Proceedings, RVK-02, Radio Science and Communications, Stockholm, 2002.
Dr. Dhanesh G. Kurup, A. Rydberg, and E. Öjefors, “Synthesis of Micromachined Antennas using the Genetic Algorithm”, in GigaHertz 2001 Symposium, University of Lund, Sweden, 2001.
P. Ridderström, Dr. Dhanesh G. Kurup, A. Rydberg, and K. Wallin, “Design of a corner fed serial microstrip patch antenna array using Genetic Algorithm”, in Electromagnetic Computations - Methods and Applications (EMB 01), Uppsala University, Sweden, 2001.
This paper presents a computationally efficient method for the design of millimeter wave H-slot coupled silicon micromachined patch antennas using a transmission line model. The analysis incorporates CAD models of the suspended substrate microstripline for the calculation of effective dielectric constant of the radiating patch. The theoretical and experimental results for a fabricated 60GHz micromachined patch antenna are compared, showing good agreement.
Dr. Dhanesh G. Kurup and A Rydberg, “Slots as impedance transformers in microwave circuit designs”, in symposium proceedings GHz-2000, Göteborg, Sweden, 2000, pp. 407-410.
E. Öjefors, J. Lindblom, A. Rydberg, Dr. Dhanesh G. Kurup, Y. Bäcklund, F. Municio, T. Ryhanen, and H. O. Scheck, “High gain micromachined slot-coupled patch-antenna for 60 GHz WLAN application”, in proceedings COST-268, Rennes, France, 2000.
Dr. Dhanesh G. Kurup, A. Rydberg, and T. Johansson, “A Nonradiative dielectric interconnect for compact radio front-ends”, in Proceedings, RVK-99, Radio Vetenskap och Kommunications, Karlskrona, Sweden, 1999.
Dr. Dhanesh G. Kurup and A. Rydberg, “Equivalent network models for active antenna design”, in Conference proceedings EMB-98, Electromagnetic computations for analysis and design of complex systems, Linköping, Sweden, 1998, pp. 195-202.
B. Sinha and Dr. Dhanesh G. Kurup, “CAD for RCS of complex objects”, in Conference Proceedings, Asia Pacific Microwave Conference, APMC, New Delhi, 1996.
V. S. Kumar and Dr. Dhanesh G. Kurup, “A new broadband Magic Tee design for Ka-Band Satellite Communications (Accepted)”, IEEE Microwave and Wireless Components Letters, 2018.
In recent research, microwave sensors have been used to follow up the recovery of lower extremity trauma patients. This is done mainly by monitoring the changes of dielectric properties of lower limb tissues such as skin, fat, muscle, and bone. As part of the characterization of the microwave sensor, it is crucial to assess the signal penetration in in vivo tissues. This work presents a new approach for investigating the penetration depth of planar microwave sensors based on the Split-Ring Resonator in the in vivo context of the femoral area. This approach is based on the optimization of a 3D simulation model using the platform of CST Microwave Studio and consisting of a sensor of the considered type and a multilayered material representing the femoral area. The geometry of the layered material is built based on information from ultrasound images and includes mainly the thicknesses of skin, fat, and muscle tissues. The optimization target is the measured S11 parameters at the sensor connector and the fitting parameters are the permittivity of each layer of the material. Four positions in the femoral area (two at distal and two at thigh) in four volunteers are considered for the in vivo study. The penetration depths are finally calculated with the help of the electric field distribution in simulations of the optimized model for each one of the 16 considered positions. The numerical results show that positions at the thigh contribute the highest penetration values of up to 17.5 mm. This finding has a high significance in planning in vitro penetration depth measurements and other tests that are going to be performed in the future.
This article presents the performance evaluation of Vector Fitting Algorithm (VFA) from a system identification perspective. In this paper, VFA has been first applied to known baseband and bandpass systems such as Butterworth lowpass and bandpass filters to analyze the algorithm's pole-residue extraction ability for band-limited noisy data. The poles identified by the algorithm for different bandwidths and noise powers are compared with the actual system poles of the baseband and bandpass systems. It is concluded that the algorithm is capable of identifying the actual system poles even if the capture bandwidth is less than the 3 dB bandwidth, which is a significant observation of this paper. It is also seen that the system identification performance with noisy data is better for baseband systems when compared to bandpass systems. Further, a practical investigation has been done to evaluate VFA performance for modeling a microstrip coupled line filter in the presence of noise.
This article presents a new method for studying the near-field electromagnetic interaction between a dielectric filled open ended circular waveguide (OECW) and a layered dielectric structure. The proposed model is based on plane wave spectrum theory using a novel and computationally efficient two step integration method. The first integral, involving multiple singularities in the integration path, is efficiently solved using a deformed elliptical integration path which encircles the singularities of the integral. The infinite domain tail integral involving the slowly converging integrand is further solved using an efficient trigonometric transformation. The proposed OECW based method is capable of determining the unknown material properties of any layered dielectric medium, and hence finds application in nondestructive evaluation of materials. © 2018, Electromagnetics Academy. All rights reserved.
In this paper, an approach to analyze the bone mineral density (BMD) based on microwave reflectivity is presented The proposed method enables us to overcome the health risks associated with diagnostic techniques such as X-rays for repeated study of the rate of mineralization in the case of fractures or de-mineralization in the case of osteoporosis. The proposed method is used to demonstrate the application of microwaves for continuous observation of skull healing process during post-cranial surgery period. The proposed technique can be a potential clinical model in future for extracting target characteristics such as bone deposition thickness and other cranial defects. Based on the conclusions of wideband measured data and signal processing techniques, we propose to design the Transceiver using ultra-wideband (UWB) pulsed technology.
Accurate and efficient formulas for computing spatial-domain Green's functions are presented in this paper. To apply the formulas, we only require a set of sample points of the spectral-domain Green's function (SDGF) on an integration path avoiding its singularities and an infinite domain tail path. Since the sampling is carried out for the integrand excluding the Bessel function, the number of sample points required is much smaller than the numerical integration method. This aspect of the proposed method proves to be very advantageous for evaluating closed-form Green's functions at large source observer distances. It is shown that the proposed formulas provide accurate results for both the near-and far-field regions as well as a wide range of material parameters such as lossless, lossy, left-handed materials as well as multilayered substrates. © 2015 IEEE.
GNU Radio is a free and open-source simulation software that provides signal processing blocks to simulate communication systems. It can be used with readily-available low-cost external RF hardware to create software defined radios, or without hardware in a simulation-like environment. It is used to support both wireless communications research and real-world radio systems. For this paper, GNU Radio has been used to simulate a trans-receive chain of a communication system for Combat Platform Identification System to minimize the incidence of fratricide among friendly forces during war. Also, comparative study of the effect of Additive White Gaussian Noise (AWGN) on DBPSK, DQPSK and GMSK modulation techniques have been carried out.
the analysis and simulation using GNU Radio.
Satellite technology plays an important role in the global communication system. A significant amount of cost and resources are dedicated for tracking and telemetry of satellite, so that no compromise is made on pointing accuracy. This paper analyses, how the antenna misalignment error affects the received power and in turn Bit Error Rate (BER). For simulation we used a Linux based open software development tool kit called GNU Radio.
We present accurate trigonometric expansions of Bessel functions of first kind and integer order for complex arguments of the form Jv(z)= ∑Kαk,S(βkz) , where α k and β k are constants and S is a sinusoidal function. Using the new expansions, varying levels of accuracy and range of applicability can be achieved by varying the number of terms in the expansions. For example, a four term expansion of J0(z) yields an average relative error of &lt;.1% for z≤2π and same accuracy is achieved for an eight term expansion for an extended range ≤ 5π. Further, a phase and amplitude corrected large argument asymptotic formula is studied such that, the lower limit of its usage is reduced to medium magnitude ranges of arguments. The new set of formulas can not only be incorporated into math libraries very easily but also be useful for treatment of radiation and scattering problems involving Bessel functions. © 1963-2012 IEEE.
A simplified approach for accurate and efficient computation of infinite domain Sommerfeld integrals (SI) associated with spatial domain Green's functions of layered media is described in this article. Integrand in SI excluding Bessel function is expressed as sum of complex exponentials using the matrix pencil method (MPM) which requires fewer terms than when we include oscillating Bessel functions. By using a novel three term representation for small arguments and classical large argument formulas of Bessel functions, analytical expressions for computing integrals along infinite domain SI tails are derived. The newly derived analytical formulas use the same MPM expansions for any given set of radial distance parameter ρ, enabling us to efficiently solve closed form Green's functions in layered media.
A computationally efficient global optimization method, the differential evolution algorithm (DEA), is proposed for the synthesis of uniform amplitude arrays of two classes, i.e., unequally spaced arrays with equal phases and unequal phases. Phase-only synthesis and the synthesis of uniformly exited unequally spaced arrays (position only synthesis) are compared and it is seen that, by using the unequal spacing, the number of array elements can be significantly reduced for attaining reduced sidelobe levels. From the DEA-based synthesis of unequally spaced arrays with uniform amplitudes and unequal phases, it is found that a tradeoff exists between the size of the unequally spaced arrays and the range of phases for the same radiation characteristics. The proposed synthesis technique using uniform amplitudes, unequal spacing, and unequal phases (position-phase synthesis) not only decreases the size of the array for the same sidelobe level compared to both the phase-only synthesis and position-only synthesis but also retains their advantages.
A compact design of an amplifying active reflect-antenna using a novel microstrip-T coupled-patch antenna is proposed. The dual-polarized ports of the microstrip-T coupled-patch antenna provide excellent RF isolation as well as dc isolation. The dc isolation helps in avoiding additional coupling capacitors in the RF path, thereby achieving reduced layout size and cross-polarization levels for the active reflect-antenna. The gain and monostatic radar cross section (RCS) measurement of the active reflect-antenna has been carried out using a time-domain technique based on a single dual-polarized antenna and vector network analyzer. The measured monostatic RCS and gains are then compared with the calculated ones using two different modeling approaches.
A novel way of feeding single-layer microstrip patch antennas using electromagnetically coupled microstrip-T junctions is proposed. The measured isolation and 10â€…dB bandwidth of an X-band dual polarised antenna are âˆ¼32â€…dB and 2.1%, respectively, on an Îµr 3.0 substrate. Since both ports of the antenna are electromagnetically coupled, the proposed antenna eliminates the need for capacitors in the RF path for active antenna applications.
A study into the application of nonresonant slots for impedance matching in microwave circuits is presented based on an evaluation of the performance of a low noise microwave transistor amplifier. Results show improved gain and noise figure characteristics for a slot matched amplifier compared to a microwave amplifier designed using transmission line stubs. Since the slots that are proposed appear in the ground plane of the active circuits, the size of the overall circuit is lower compared to that of an amplifier designed using transmission line stubs.
Dielectric connectors for multilayered hybrid integration technology are considered in this paper. The design of one of the connectors which works on the nonradiative dielectric (NRD) waveguide mode has been carried out using a transmission-line model. For this connector, since the slots for the microstrip NRD guide coupling lie directly above one another, considerable space is released compared to the traditional method of using an NRD guide. To further enhance the integration, a novel way of feeding the dielectric connector using a tail-ended tapered microstrip line has also been designed and tested.&nbsp;©1999 John Wiley &amp; Sons, Inc. Microwave Opt Technol Lett 23: 230–233, 1999.
Scholar : Roopa R., M. Tejaswi, Priyadarshini S. A.
Scholar : R. V. Saikarteek, Pratheik A, Yeshaswy R.
Scholar : Kavita, Priyanka, Yeshwanthi.
Sanjika Devi (Amrita Vishwa Vidyapeetham, Bengaluru campus).
Senthil Kumar (ISRO Satellite Centre, Bengaluru).
Vineetha Jain (Amrita Vishwa Vidyapeetham, Bengaluru campus).
Gayathri Narayanan (Amrita Vishwa Vidyapeetham, Amritapuri campus).
Vrinda K (Amrita Vishwa Vidyapeetham, Bengaluru campus).
Parul Mathur (Amrita Vishwa Vidyapeetham, Bengaluru campus).
Anusree S (Amrita Vishwa Vidyapeetham, Bengaluru campus).

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