Debdeep Sarkar

Debdeep Sarkar
Indian Institute of Science | IISC · Department of Electrical and Communication Engineering

PhD (Electrical Engineering)

About

142
Publications
21,574
Reads
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1,517
Citations
Citations since 2017
100 Research Items
1254 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
Introduction
Dr. Debdeep Sarkar obtained his B.E. in ETCE from Jadavpur University in 2011, and his M.Tech. and Ph.D. in EE from IIT Kanpur, in 2013 and 2018 respectively. He has worked as Visiting Researcher and Post-doctoral fellow in RMC Canada, respectively during May 2017-Aug 2017 and Nov 2018-Feb 2020. After briefly serving as Assistant Professor in Dept of EE, IIT Ropar (March-July 2020), he has now joined as an Assistant Professor in Dept of ECE, IISc Bangalore since August 2020.
Additional affiliations
August 2020 - present
Indian Institute of Science
Position
  • Professor (Assistant)
Description
  • I am currently working as an Assistant Professor in the Department of ECE, IISc Bangalore. My current research interests include: MIMO antenna/array design for 5G and beyond, channel modelling for massive MIMO systems and WBAN, near field theory and EM energy aspects.
March 2020 - July 2020
Indian Institute of Technology Ropar
Position
  • Professor (Assistant)
November 2018 - February 2020
Royal Military College of Canada
Position
  • PostDoc Position
Description
  • I have worked with Prof. Yahia Antar's research group, focusing on theoretical and computational aspects of antenna near fields, as well as MIMO antennas for 5G systems.
Education
January 2014 - October 2018
Indian Institute of Technology Kanpur
Field of study
  • Electrical Engineering
August 2011 - June 2013
Indian Institute of Technology Kanpur
Field of study
  • Electrical Engineering
July 2007 - June 2011
Jadavpur University
Field of study
  • Electronics and Telecommunication Engineering

Publications

Publications (142)
Article
In this paper, the concept of cross-correlation Green's functions (CGF) is used in conjunction with the finite difference time domain (FDTD) technique for calculation of envelope correlation coefficient (ECC) of any arbitrary MIMO antenna system over wide frequency band. Both frequency-domain (FD) and time-domain (TD) post-processing techniques are...
Article
In this paper, we completely eliminate all numerical integrations needed to compute the far-field envelope crosscorrelation (ECC) in multiple-input-multiple-output (MIMO) systems by deriving accurate and efficient analytical expressions for the frequency-domain cross-correlation Green’s functions (CGF), the most fundamental electromagnetic kernel n...
Article
We present a general and comprehensive approach to evaluate spatio-temporal localized energy around radiating structures of arbitrary shapes and excitation signals. The method utilizes the finite-difference time-domain (FDTD) algorithm to calculate the Poynting localized energy for any antenna by working directly with computed fields, rather than s...
Article
In this letter, we present a co-linearly polarized in-band full-duplex (FD) microstrip antenna system with passive self-interference cancellation achieved from extremely high inter-port isolation. The proposed FD antenna achieves this isolation enhancement without the use of any circulator, hybrid or complex feed-network, by adopting a novel combin...
Preprint
p>In this letter, we propose the designs of 1-bit and 2-bit digitally coded metasurfaces, which achieve anomalous reflection-based beam-steering. First, we demonstrate the systematic design flow of coded metasurface using phase gradient digital unit cells to achieve anomalous reflection in the preferred direction for a normally incident plane wave....
Preprint
p>In this letter, we propose the designs of 1-bit and 2-bit digitally coded metasurfaces, which achieve anomalous reflection-based beam-steering. First, we demonstrate the systematic design flow of coded metasurface using phase gradient digital unit cells to achieve anomalous reflection in the preferred direction for a normally incident plane wave....
Article
In this paper, a co-linearly polarized shared radiator (SR) based in-band full-duplex (FD) microstrip antenna with high Tx-Rx isolation is proposed. The Tx and Rx terminals of the proposed FD antenna are designed on a single patch, where a series of vias are loaded in the central line of the patch followed by two L-shaped stubs at either end, which...
Preprint
p> In this paper, we propose a parasitic patch-based method to improve the power transfer efficiency of radiative wireless power transfer (WPT) systems involving implanted biomedical devices. The proposed WPT system uses circularly polarised antennas, having a four-element sequentially rotated antenna array, as the Tx and a miniaturized circularly...
Preprint
p>In this paper, we present an electromagnetic (EM) Lagrangian approach to quantify the reactive energy density distribution around generic antenna systems operating in the time-harmonic regime. First, we introduce the `period-averaged EM Lagrangian density' for radiating EM fields and present its intrinsic relations with the complex Poynting vecto...
Preprint
Full-text available
In this paper, we propose a closely spaced multi-antenna system with passive self-interference cancellation (p-SIC) of ~ 90 dB between the transmitter and receiver antenna for full-duplex application. The p-SIC is achieved by field confinement near individual antennae using shorted metallic vias and the application of U-shaped perturbation in the g...
Preprint
Full-text available
A compact quasi-Yagi antenna with a modified ground plane is designed for a through-wall radar (TWR) on-chip. A slot-based ground plane modification in the proposed antenna results in significant miniaturization with an increase in the impedance bandwidth by 44.62%. The antenna has a high directivity of 9.02 dBi and a front-to-back ratio of 25.76 d...
Article
italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Research is often succinctly defined as: “creative and systematic work undertaken to increase the stock of knowledge” [1] , although obtaining an all-encompassing delineation of the term is an insurmountable task indeed. The key differences and inter...
Preprint
In this paper, MATLAB based computational approaches for the design and analysis of time-varying capacitors using the finite-difference time-domain (FDTD) technique and the Simulink design environment are presented. The FDTD formulation for multiple lumped capacitors loaded in series on a transmission line is discussed and extended to include time...
Preprint
In this paper, MATLAB based computational approaches for the design and analysis of time-varying capacitors using the finite-difference time-domain (FDTD) technique and the Simulink design environment are presented. The FDTD formulation for multiple lumped capacitors loaded in series on a transmission line is discussed and extended to include time...
Conference Paper
In this paper, a circular polarization based wireless power transfer system is proposed for implantable medical devices (IMDs). Initially, a sequentially rotated left-handed circular polarization (LHCP) array operating at 2.4 GHz is designed for transmitter. Similarly, for receiver a miniaturised LHCP implantable antenna is designed inside a skin b...
Conference Paper
In this paper, we critically examine the frequency dependent path-loss characteristics and impacts of multiple additional side-lobes in the radiated beams (i.e. scalloping) in an IRS (intelligent reflecting surface) assisted SISO (single-input single-output) communication link. Using Method-of-Moment based MATLAB Antenna Toolbox, we analyze a syste...
Preprint
In this paper, we develop a formalism based on electromagnetic Lagrangian which provides new insights about the near-field reactive energy density around generic antennas for arbitrary spatio-temporal excitation signals. Using electric and magnetic fields calculated via FDTD technique and interpolation routines, we compute the EM Lagrangian density...
Preprint
In this paper, we develop a formalism based on electromagnetic Lagrangian which provides new insights about the near-field reactive energy density around generic antennas for arbitrary spatio-temporal excitation signals. Using electric and magnetic fields calculated via FDTD technique and interpolation routines, we compute the EM Lagrangian density...
Article
In this paper, we develop a formalism based on electromagnetic Lagrangian which provides new insights about the near-field reactive energy density around generic antennas for arbitrary spatio-temporal excitation signals. Using electric and magnetic fields calculated via FDTD technique and interpolation routines,we compute the EM Lagrangian density...
Article
Full-text available
In this paper, we propose a compact four-port dual-band MIMO antenna with suppressed higher order modes (HOMs). First, complementary split ring resonator (CSRR) loading is used on a square microstrip antenna to achieve simultaneous miniaturization and dual-band response. Next, the HOMs in the proposed CSRR loaded MIMO configuration are analysed usi...
Chapter
The objective of this book was to present computational and analytical frameworks to critically analyse EM wave interaction with time-varying media, a problem that is gaining significant attention among physicists and engineers these days. In Chap. 1 (Introduction), we presented the various exotic properties of such time-periodic media, which are d...
Chapter
In this chapter, we first emphasize upon the unique properties of generic time-periodic permittivity-modulated media like momentum gaps and parametric amplification/absorption. Then we showcase the formulation of a state-transition matrix-based analytical approach for the studies on EM wave propagation in dielectric media having step-periodically v...
Chapter
This chapter begins with a recapitulation of key theories pertaining to classical electromagnetism: Maxwell’s equations, constitutive relations and electromagnetic (EM) boundary conditions. After that, the importance of full wave and asymptotic computational EM frameworks are highlighted, with emphasis on the application purview of finite-differenc...
Chapter
In this chapter, first the EM wave-equations are derived for electric and magnetic fields in a general time-varying but space-invariant infinitely extended medium. The concept of velocity modulation is discussed for the scenarios when the ratio of permittivity and permeability functions is constant or both are slowly varying with time. We then intr...
Article
In this paper, MATLAB based computational approaches for the design and analysis of time-varying capacitor- loaded transmission lines using the finite-difference time-domain (FDTD) technique and the Simulink design environment are presented. The FDTD formulation for multiple lumped capacitors loaded in series on a transmission line is discussed and...
Article
Full-text available
In this paper, we propose a closely spaced two-port microstrip patch antenna system with significant isolation enhancement (> 90 dB), which can be deployed for MIMO as well as full-duplex transceiver systems. We deploy a resonant combination of rectangular defected ground structure (DGS) and a near-field decoupling structure (NFDS) in the vicinity...
Article
Full-text available
In this paper, we demonstrate the usefulness of MoM (Method-of-Moments) based methods in efficient path-loss modelling for SISO (single-input single-output) communication links assisted by IRS (Intelligent Reflecting Surfaces). Being a full-wave computational electromagnetic tool, MoM is better equipped compared to high-frequency asymptotic methods...
Article
In this article, we reconsider the subject of spatiotemporal electromagnetic (EM) energy around the antenna near field from a fundamental perspective and discuss the use of radiation quality factors (Q factors) in this context. After a thorough literature review, we demonstrate how minimization of the Q factor and maximization of the directivity Q...
Article
A novel multifunctional exponentially tapered slot (Vivaldi) antenna exhibiting tunable frequency-notched and tunable narrow-band operation is proposed in this article. Integration of multiple varactor-coupled split-ring resonators (VC-SRRs) into the feed region of the Vivaldi yields a wideband tunable frequency-notched response upon suitable tunin...
Preprint
In this paper, we develop a formalism based on either spatially or temporally integrated electromagnetic (EM) Lagrangian, which provides new insights about the near-field reactive energy around generic antennas for arbitrary spatio-temporal excitation signals. Using electric and magnetic fields calculated via FDTD technique and interpolation routin...
Article
The COVID-19 pandemic also posed significant challenges for the higher education community worldwide, necessitating educators and students across all levels of education to adapt quickly to “online education” (for example, virtual courses/emergency remote learning), traditionally viewed as an alternative pathway and well suited mainly to adult lear...
Article
Full-text available
Linear-array of circular split ring resonators (C-SRR) integrated wideband notched filtering horn antenna with very strong rejection-band is proposed in this article. The linear C-SRR array, consisting of 3-sub arrays each having 4 identical C-SRR-elements, is printed on a dielectric substrate and is integrated into the throat or waveguide-section...
Article
Full-text available
In this paper, we explore the dynamics of electromagnetic energy, especially in the near‐field region of radiating antennas, from a fundamental perspective (ie, no limitations on antenna shape and nature of excitation signal) and identify some key future research directions. First, we provide a comprehensive critique of the frequency‐domain reactiv...
Preprint
Full-text available
In this paper, we deploy a full-wave FDTD paradigm to investigate the effect of reconfigurable intelligent surface (RIS) -- switchable frequency-selective surfaces (FSS) -- on generic massive MIMO uplink channel's eigenspace structure. We place an RIS based on two switchable FSS layers in the vicinity of a 64-element massive MIMO base-station (BS)...
Article
Full-text available
In this paper, we present an efficient finite-difference time-domain (FDTD) computational paradigm to estimate the channel matrix of generic massive MIMO systems. Considering an example having 196 base-station (BS) elements and 6 equispaced user-equipment (UE) devices, we compute the dominant eigenspace for the uplink channel using FDTD. The result...
Conference Paper
In this paper, we present a unified computational scheme FDTD-IDM-CGF, which combines the well-known finite-difference time-domain (FDTD) technique with the infinitesimal dipole modelling (IDM) and cross-correlation Greens functions(CGF). The proposed FDTD-IDM-CGF methodology is extremely useful for investigation of fundamental problems pertaining...
Preprint
We propose a source-based approach to the analysis and evaluation of cross-correlation in generic near-field (NF) interaction scenarios. The proposed theory integrates electromag-netics and stochastic considerations to derive a general formula for Rx port-to-port cross-correlation. The derivation is quite general and is expressed in terms of the st...
Article
We propose a source-based approach to the analysis and evaluation of cross-correlation in generic near-field (NF) interaction scenarios. The proposed theory integrates electromagnetics and stochastic considerations to derive a general formula for Rx port-to-port cross-correlation in terms of the stochastic correlation tensor of random NF source clo...
Article
In this paper, we propose an Infinitesimal Dipole Model, Cross-Correlation Green's Function (IDM-CGF) algorithm suitable for the efficient determination of spatial correlation matrix data for massive MIMO antennas with arbitrary element polarization and inter-element spacing. Through observations of the dominant eigenspace of the massive MIMO corre...
Preprint
Full-text available
In this paper, we completely eliminate all numerical integrations needed to compute the far-field envelope cross-correlation (ECC) in multiple-input-multiple-output (MIMO) systems by deriving accurate and efficient analytical expressions for the frequency-domain cross-correlation Green's functions (CGF), the most fundamental electromagnetic kernel...
Article
Full-text available
We provide a general and rigorous formulation of antenna localized electromagnetic radiation energy in generic antenna systems based on Poynting flow instead of the spectral approach proposed earlier. The main theory is first developed using the principles of energy-momentum conservation and the center-of-energy theorem, culminating in the derivati...
Article
A general computational paradigm, the time-domain IDM method, is developed and applied to compute reactive energy and radiated power for arbitrary shaped antennas with different time-domain excitations. The proposed technique first utilizes finite-difference time-domain (FDTD) method to compute the time-domain radiating antenna currents from nearzo...
Conference Paper
Full-text available
In this paper, a four element MIMO configuration is proposed for possible application in sub-6 GHz 5G wireless access points working in 3 – 4 GHz frequency bands. The proposed antenna uses microstrip-fed square slot-loops loaded with split-ring resonators (SRRs) to achieve miniaturized multiband performance, where extended bandwidth is achieved in...
Conference Paper
In this paper, a compact microstrip-fed multi-band frequency reconfigurable monopole is realized by utilizing capacitively loaded loops (CLLs) with embedded PIN diodes as loading elements. Depending on the ON / OFF state of the PIN diodes on the CLLs, quad-band / penta-band / hexa-band characteristics can be achieved from the proposed antenna. All...
Conference Paper
Full-text available
In this paper, a new cross-correlation Green's function (CGF) is formulated, considering the mutual interaction between electric and magnetic source current distributions. This additional CGF is essential for complete analysis of envelope correlation coefficient (ECC) for “hybrid” MIMO antenna systems that contain both dipoles (electric current sou...
Conference Paper
In this paper, design of a wide-band SIW-fed printed Yagi antenna with frequency dependent radiation properties is reported. The proposed antenna utilizes an offset longitudinal slot on the SIW-feed structure, which excites a higher frequency antenna resonance having broadside radiation characteristics. Merging of this slot-mode with the end-fire Y...
Conference Paper
Full-text available
In this paper, design of a two element loop-loaded printed dipole array having miniaturized dual-band characteristics is presented. At the lower operating frequency of 1.64 GHz, the proposed array exhibits tilted dual-beam radiation (peak gain 4.11 dBi)about the azimuth plane, due to the tightly coupled loop mode. At the higher operating frequency...
Article
An FDTD-based technique for evaluating envelope correlation coefficient (ECC) and mean effective gain (MEG) of MIMO antennas operating in real-life non-uniform propagation environment is introduced. The proposed algorithm is based on the formulation of a modified cross-correlation Greens function (CGF), which directly incorporates the specific angu...
Conference Paper
Full-text available
In this paper, the concept of time-domain crosscorrelation Green's function (CGF) is introduced to facilitate calculation of envelope correlation coefficient (ECC) for wideband MIMO antenna systems. Furthermore, a quasi-analytical technique utilizing Taylor's series expansion is proposed in order to reduce the dependency on numerical integrations i...
Conference Paper
In this paper, a compact two-port MIMO antenna is designed, which uses a shared orthogonally fed slot-loop, loaded with split-ring resonators (SRRs). The SRRs reduce the operating frequency of the slot-loop, leading to miniaturized antenna footprint of 0.059λ2 (λ being the operating wavelength). Also the SRRs significantly enhance the inter-element...
Conference Paper
Full-text available
In this paper, the problem of determining electromagnetic energy in the near-field of antennas is critically revisited. It is emphasized why one must look beyond the traditional antenna-Q factor and investigate near-field EM energy from a time-domain approach. A finite-difference time-domain (FDTD) simulation strategy for calculating reactive energ...
Conference Paper
In this paper, a four-element MIMO antenna based on quasi-self-complementary (QSC) elements is proposed, which has ultra-wideband (UWB) characteristics (3.1-10.6 GHz) with notch-band in upper WLAN frequency range (5.15-5.85 GHz). The UWB elements are trapezoidal shaped monopoles having complementary cuts in the ground plane. The WLAN-band notched f...
Article
A quad-band dual-polarized monopole with asymmetrical microstrip feed line is proposed in this letter. The proposed antenna exhibits a linearly polarized behaviour in three operating bands for UMTS, WLAN 2.4 GHz and WiMAX 3.5 GHz applications while a circularly polarized nature in the lowermost band for the GPS/GLONASS. The multi-band operation is...
Article
In this letter, a four-element dual-band MIMO configuration consisting of split-ring resonator (SRR) loaded inverted L-monopole antenna (ILA)elements is realized. In the proposed antenna, the lower frequency mode of the unloaded MIMO configuration merges with one SRR-induced antenna resonance. This leads to antenna operation around 2.93 GHz with wi...
Article
In this letter, a four-element wide-band MIMO configuration consisting of inverted L-monopole antenna (ILA) elements is proposed. An additional low frequency operating mode arises in the MIMO system due to symmetric arrangement of elements with inter-connected ground, apart from the resonance of the isolated ILA. Utilizing this mode, the proposed M...