Dr Tarun Kumar
@jyothyit.ac.in
Associate Professor
Jyothy Institute of Technology
Dr. Tarun Kumar, Associate Professor in the Department of Electronics and Communication Engineering, received his Diploma in Electronics Engineering from Government Polytechnic, Narender Nagar (Tehri Garhwal), and Uttarakhand, in 1996, Bachelor’s Degree (AMIETE) in Electronics & Telecommunication Engineering from The Institution of Electronics & Telecommunication Engineers (IETE), New Delhi in year 2003 and, M.Tech. in Communication Systems & Signal Processing from Jaypee Institute of Information Technology (JIIT), Noida (U.P) in 2008. He has completed his Ph.D. from Jaypee Institute of Information Technology (JIIT), Noida (U.P) in 2017 with his research area being Electromagnetic Metamaterials. He has 3 years of Industry experience and 14 years of academic experience. His research interests include Electromagnetic Metamaterials, Electromagnetic Scattering, Microstrip Antennas and Electromagnetic Sensors. He has published 22 research papers in various International journals and intern
EDUCATION
Doctorate in Electronics & Communication Engineering
RESEARCH INTERESTS
Electromagnetic Metamaterials, Biomedical Applications of the RF and Microwave and Microstrip Antennas
Scopus Publications
Scholar Citations
Scholar h-index
Scopus Publications
R. Rajesh Kanna, P. Jeyakumar, N. Lenin, G. Marimuthu, Mookkandi Palsamy Kesavan, and T. Venish Kumar
Springer Science and Business Media LLC
B. Manikandan, D. Thiripurasundari, R. Athilingam, G. Karthikeyan, and T. Venish Kumar
Springer Nature Singapore
Tarun Kumar, Natarajan Kalyanasundaram, and Geetam Singh Tomar
Informa UK Limited
Tarun Kumar and Natarajan Kalyanasundaram
Informa UK Limited
The work presented in this paper involves the analysis of effective permittivity and permeability of a ferromagnetic microwire grid consisting of an infinite number of ferromagnetic microwires. Analytical solution is obtained through satisfying the tangential boundary conditions at the surface of a reference microwire. Subsequently, the local and average fields and hence, effective permittivity and permeability are obtained within a unit cell. The analysis reported in the literature allows to calculate only and components of the effective permittivity and permeability for the case of polarization with normal incidence. Proposed analysis provides a most generalized solution for the three diagonal elements of the effective permittivity and permeability tensors for the case of arbitrary polarization with arbitrarily incident uniform plane wave. Numerical results are obtained through MATLAB to show the impact of frequency, radius of the microwires, periodicity and applied external magnetization on the effective permittivity and permeability for and polarization. A comparative analysis is also done with the numerical results available in the literature to validate the proposed method of analysis.
Tanisha Gupta, Tarun Kumar, and Rajeev Kamal
Springer Singapore
Vishal Pant, Yogendra Choudhary, Abhinav Sharma, Tarun Kumar, and R. Gowri
Springer Singapore
Tarun Kumar
IEEE
The problem of electromagnetic scattering of a uniform plane wave from an axially magnetized ferromagnetic microwire in free space is theoretically investigated in this paper using impedance boundary condition. A comparison of the results of proposed analysis is done with the results of normal incidence case of scattering obtained by exact analysis available in the literature in order to find the extent of agreement in the two approaches in terms of the radius of microwire. Impact of the radius and surface impedance of the microwire on the scattered field are discussed in detail.
Tarun Kumar and Natarajan Kalyansundaram
The Electromagnetics Academy
Effective permittivity and permeability of a medium consisting of an infinite number of ferromagnetic microwires are evaluated in this paper. Analysis is carried out with the help of local and average fields inside a unit cell. In the literature, effective permittivity of the microwire grid is obtained by assuming the grid as an impedance loaded surface. The analysis is applicable only for the case of TMz polarized normally incident wave. Proposed analysis enable us to evaluate all the three diagonal components of effective permittivity and permeability for arbitrarily incident uniform plane wave having arbitrary polarization angle. Numerical results are obtained through MATLAB, and a comparison is done with the results available in the literature for validation. Numerical results have shown a DNG like behaviour of the medium for a TMz polarized incident wave.
Tarun Kumar
IEEE
A novel method of analysis for the evaluation of effective permittivity and effective permeability of a ferromagnetic microwire grid consist of an infinite number of microwires is presented in this paper. The analysis is carried out through the evaluation of unknown scattering field coefficients of the reference microwire for a uniform plane wave incident normal to the surface of microwire. Evaluation of the unknown scattering field coefficients is obtained through boundary value type solution available in the literature. The current induced in each microwire is shown to be related to the scattering field coefficient. Average polarization over a unit cell is calculated with the help of current induced in the microwire. Finally, effective permittivity and effective permeability are evaluated with the help of average polarization over a unit cell. Numerical results are obtained for TMz and TEz polarizations in terms of the variation in effective permittivity and effective permeability with respect to the operating frequency.
Tarun Kumar, Natarajan Kalyanasundaram, and Bhaurao K. Lande
Informa UK Limited
A boundary value type solution of the generalized case of scattering from an array consisting of a finite number of axially magnetized ferromagnetic circular cylinders is presented in this paper. Proposed analysis is carried out by matching the tangential fields at the surface of each cylinder to find the unknown expansion coefficients of the scattered field. A planar array having size and a linear array having size consist of ferromagnetic microwires are considered to obtain the numerical results for and polarizations in terms of the variation in scattered field components of the near field and scattering cross section with respect to the angle of incidence, radius of microwires, spacing among the microwires, number of microwires in the array, and operating frequency. For validation, theoretical results of the method already available in the literature are simulated for a linear array and compared to match with the numerical results of proposed analysis for the same array. In order to prove the generalization of the solution in terms of the number of microwires, simulated results specialized to the case of single ferromagnetic microwire are shown to be matched with the results available in the literature for the special case.
T. Kumar, N. Kalyanasundaram, and B. K. Lande
Advanced Electromagnetics
A generalized solution of the scattering problem from an array containing a finite number of axially magnetized ferromagnetic cylinders of infinite length placed in free space is presented in this paper. The analysis is carried out by matching the tangential boundary conditions at the surface of each cylinder to find the unknown expansion coefficients of the scattered field. Planar arrays consist of a finite number of ferromagnetic microwires are considered to obtain the numerical results for TMz and TEz polarizations in terms of the variation in scattered field components of the near field and scattering cross section (SCS) with respect to angle of incidence, radius of microwires, spacing among the microwires and operating frequency. For validation purpose, numerical results of the proposed analysis specialized for the case of single microwire and normal incidence for TMz polarization are compared with the results available in the literature for the specialized case and both are found to be matched completely.
Tarun Kumar, Natarajan Kalyanasundaram, and Bhaurao Kashirao Lande
The Electromagnetics Academy
This paper investigates the generalized case of scattering from a planar grid, containing inflnite numbers of axially magnetized ferromagnetic microwires placed parallel to each other in free space. A semi-analytical solution is obtained by calculating the local fleld at the surface of the reference microwire which is the sum of the scattered fleld from the other microwires as well as the incident fleld. Graf's theorem is used to transform the scattered fleld from one coordinate system to the other. Scattering fleld coe-cients for the reference microwire are obtained by matching the tangential fleld components at the surface of the reference microwire. Simulated results are expressed in terms of the Re∞ection, Transmission and Absorption Coe-cients for the TMz and TEz polarizations. For validation, results of the proposed analysis specialized to the case of normal incidence with TMz polarization are compared with the results available in the literature.