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Roman Jobava - IEEE Xplore Author Profile
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Roman Jobava

Also published under: R. G. Jobava, R. Jobava, Roman G. Jobava

Publications
119
Citations
446
Publications by Year
19962024
Co-Authors:
Show All Co-Authors (100)
Image of author Roman Jobava

Roman Jobava

Also published under: R. G. Jobava, R. Jobava, Roman G. Jobava

Affiliation

Tbilisi State University, Georgia
EMCoS LLC, Georgia

Publication Topics

Biography

Roman G. Jobava (M'97) was born in Sokhumi, Georgia, in 1965. He received the Ph.D. degree in radiophysics from Tbilisi State University, Tbilisi, Georgia, in 1990.,In 1996, he joined Tbilisi State University as an Associate Professor. From 1987 to 2000, he was a Senior Researcher with the Laboratory of Applied Electrodynamics, Tbilisi State University, responsible for computer simulation of transient electromagnetic phenomena and development of numerical and software tools. In 2001, he began leading EM Consulting and Software, EMCoS LLC., Tbilisi, Georgia. His research interests include numerical methods in applied electrodynamics, computer simulation of EMC problems, electrostatic discharge, and transient field calculations, as well as so...
Publications
119
Citations
446
Publications by Year
19962024
Co-Authors:
Show All Co-Authors (100)
Author's Published Works

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Extended Capabilities of PEEC-based Approach for the Modelling and Design of Common-Mode Chokes

Diana Eremyan;Anna Gheonjian;Zviadi Kutchadze;Roman Jobava

2024 International Symposium on Electromagnetic Compatibility – EMC Europe
Year: 2024 | Conference Paper |
This paper presents modelling methodology for common-mode chokes (CMC) with multi-wire (double or triplewire) winding’s structure, bifilar CMC and 4-phase power inductors with toroidal and oval-shaped magnetic cores. Simulation models are based on the Partial Element Equivalent Circuit (PEEC) method. Validation of the PEEC-based models of the examined chokes is performed by comparison of the calcu...Show More

Extended Capabilities of PEEC-based Approach for the Modelling and Design of Common-Mode Chokes

Diana Eremyan;Anna Gheonjian;Zviadi Kutchadze;Roman Jobava

Year: 2024 | Conference Paper |

Acceleration of Mirror Image Method Using 3D Poisson Summation Approach for Solving Antenna Problems in a Stirred Reverberation Chamber

Faik Bogdanov;Irina Chochia;David Karkashadze;Roman Jobava

2024 International Symposium on Electromagnetic Compatibility – EMC Europe
Year: 2024 | Conference Paper |
3D Poisson Summation Approach is proposed to accelerate the MoM-based mirror image method (MIM) solution to antenna problems in large closed cavities such as Reverberation Chambers including radiating wire antennas and stirrers. The developed approach is validated by comparison of the fields due to a wire antenna in a realistic RC with direct MoM. The benefit of the proposed approach compared to d...Show More

Acceleration of Mirror Image Method Using 3D Poisson Summation Approach for Solving Antenna Problems in a Stirred Reverberation Chamber

Faik Bogdanov;Irina Chochia;David Karkashadze;Roman Jobava

Year: 2024 | Conference Paper |

Analytical Prediction of Magnetic Field Shielding for Multilayer Thin Sheets Excited by Loop Sources

Giorgi Korkotadze;Giorgi Chiqovani;Roman Jobava

2024 IEEE 29th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)
Year: 2024 | Conference Paper |
This paper presents an analytical method for calculating the near-field magnetic shielding effectiveness of two- and three-layer thin sheets. Using the vector wave equation and boundary conditions, the method calculates the shielding effectiveness, with integrals evaluated both numerically and analytically. This approach is validated by experimental data from Moser's research and numerical modelli...Show More

Analytical Prediction of Magnetic Field Shielding for Multilayer Thin Sheets Excited by Loop Sources

Giorgi Korkotadze;Giorgi Chiqovani;Roman Jobava

Year: 2024 | Volume: 1 | Conference Paper |

Extension of a Hybrid MTL/MoM Approach for Automotive Applications

Irina Oganezova;Anna L. Gheonjian;Badri Khvitia;Xavier Bunlon;Roman Jobava

IEEE Transactions on Electromagnetic Compatibility
Year: 2024 | Volume: 66, Issue: 3 | Journal Article |
In this article, we use an extended hybrid multitransmission line (MTL)/method of moments (MoM) approach for analyzing the diesel common-rail distribution system model installed in a perfect electrically conductive automotive vehicle and its interaction with an EMC wideband antenna in the 20–200 MHz frequency band. The proposed workflow involves analyzing the impedance of a discontinuity, such as ...Show More

Extension of a Hybrid MTL/MoM Approach for Automotive Applications

Irina Oganezova;Anna L. Gheonjian;Badri Khvitia;Xavier Bunlon;Roman Jobava

Year: 2024 | Volume: 66, Issue: 3 | Journal Article |

PEEC-based Wideband Micro-Model of Inductive Components for Power Electronics Applications

Diana Eremyan;Anna Gheonjian;Davit Imnadze;Konstantin Parshutkin;Roman Jobava

2023 International Symposium on Electromagnetic Compatibility – EMC Europe
Year: 2023 | Conference Paper |
Cited by: Papers (2)
This paper presents modeling approach for the fast and accurate simulations of the power inductors with toroidal core. The proposed method is developed in order to generate a wideband micro-model of a common-mode (CM) chokes represented as Partial Element Equivalent Circuit (PEEC). The combination of the analytical solution and 2D static simulation is used to obtain the values of the physical para...Show More

PEEC-based Wideband Micro-Model of Inductive Components for Power Electronics Applications

Diana Eremyan;Anna Gheonjian;Davit Imnadze;Konstantin Parshutkin;Roman Jobava

Year: 2023 | Conference Paper |

Application of Entire Domain Hyper Basis Functions Approach to Solution of EMC Problems

Faik Bogdanov;Irina Chochia;Roman Jobava

2023 International Symposium on Electromagnetic Compatibility – EMC Europe
Year: 2023 | Conference Paper |
This paper aims to extend the previously proposed HBF-based MoM approach to analyze EMC problems. This approach uses the eigenfunctions of the generalized eigenvalue equation (GEE) obtained at only one frequency as entire domain hyper basis functions (HBFs) to find the desired solution to the boundary value problem in the broadband frequency range. This paper demonstrates the application of this a...Show More

Application of Entire Domain Hyper Basis Functions Approach to Solution of EMC Problems

Faik Bogdanov;Irina Chochia;Roman Jobava

Year: 2023 | Conference Paper |

Virtual Triaxial Setup Modeling for Numerical Determination of Transfer Impedance of Shielded Cables

Iskander Badzagua;Ilona Danelyan;Kakhaber Odisharia;Anna Gheonjian;Roman Jobava

2023 International Symposium on Electromagnetic Compatibility – EMC Europe
Year: 2023 | Conference Paper |
In this paper, we present a numerical approach for analysis of cable shields, where a computational model is constructed to represent Triaxial Setup measurement procedure. Transfer impedance is calculated using multi-conductor transmission line (MTL) approach. Virtual Triaxial Setup is divided into 2D cross-sections along the axis of the cable. After that, frequency dependent P.U.L. parameters are...Show More

Virtual Triaxial Setup Modeling for Numerical Determination of Transfer Impedance of Shielded Cables

Iskander Badzagua;Ilona Danelyan;Kakhaber Odisharia;Anna Gheonjian;Roman Jobava

Year: 2023 | Conference Paper |

PEEC Solution of EM-Circuit Problems for Combined Metalic and Dielectric Structures Based on the Augmented Integral Equations

Giorgi Chiqovani;Alexander Demurov;Diana Eremyan;Davit Imnadze;Anna Gheonjian;Roman Jobava

2023 International Symposium on Electromagnetic Compatibility – EMC Europe
Year: 2023 | Conference Paper |
This paper presents a full-wave triangular mesh based partial element equivalent circuit (PEEC) approach in the frequency domain for combined metal-dielectric structures based on A-PMCHWT and E-PMCHWT formulations of the augmented electric field integral equation (A-EFIE). The method avoids so called low frequency breakdown of EFIE and takes into account phase shifts of fields radiated by partial ...Show More

PEEC Solution of EM-Circuit Problems for Combined Metalic and Dielectric Structures Based on the Augmented Integral Equations

Giorgi Chiqovani;Alexander Demurov;Diana Eremyan;Davit Imnadze;Anna Gheonjian;Roman Jobava

Year: 2023 | Conference Paper |

Common Mode Loop Impedance Analysis for Wire System in the Vehicle using PEEC Solution

I. Oganezova;A. Gheonjian;B. Khvitia;R. Jobava;X. Bunlon

2023 International Symposium on Electromagnetic Compatibility – EMC Europe
Year: 2023 | Conference Paper |
The novel simulation process based on the dual probe method and an enhanced partial element equivalent circuit (PEEC) is developed and validated. With a proper calibration process, the proposed method allows us to determine the common mode (CM) loop impedance of the complex cable system in vehicles at the early design stages. These CM loop impedances will be useful for designing a cable system, wh...Show More

Common Mode Loop Impedance Analysis for Wire System in the Vehicle using PEEC Solution

I. Oganezova;A. Gheonjian;B. Khvitia;R. Jobava;X. Bunlon

Year: 2023 | Conference Paper |

Comparison of MoM Solutions to Radiation and Scattering Problems on Wire and Surface Models of Microwave Antennas with Linear Elements

Faik Bogdanov;Lily Svanidze;Irina Chochia;Roman Jobava

2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)
Year: 2022 | Conference Paper |
Cited by: Papers (2)
An aim of this paper is to compare thin-wire and surface modeling techniques in MoM solution of radiation and scattering problems on microwave antennas with linear and mixed mesh geometries. This is done for two different feed schemes proposed for surface and wire models: delta-gap and wide-gap. The proposed approach is applied to analyzing canonical antenna geometries with linear elements.Show More

Comparison of MoM Solutions to Radiation and Scattering Problems on Wire and Surface Models of Microwave Antennas with Linear Elements

Faik Bogdanov;Lily Svanidze;Irina Chochia;Roman Jobava

Year: 2022 | Conference Paper |

Validation of HBF-Based MoM Approach to Solution of Radiation and Scattering Problems on Microwave Antennas With Linear Elements

Faik G. Bogdanov;Lily Svanidze;Irina Chochia;Roman Jobava

IEEE Transactions on Antennas and Propagation
Year: 2022 | Volume: 70, Issue: 11 | Journal Article |
Cited by: Papers (3)
A recently proposed method of moment (MoM)-based approach is extended to efficiently solve broadband radiation and scattering problems on wire and mixed geometries. This approach is based on expanding the total current on a conducting structure at any desired frequency in terms of entire domain hyper basis functions (HBFs), calculated at only one frequency. The developed approach is validated by c...Show More

Validation of HBF-Based MoM Approach to Solution of Radiation and Scattering Problems on Microwave Antennas With Linear Elements

Faik G. Bogdanov;Lily Svanidze;Irina Chochia;Roman Jobava

Year: 2022 | Volume: 70, Issue: 11 | Journal Article |

MoM Solution of Broadband Radiation and Scattering Problems Based on Entire-Domain Hyperbasis Functions Approach

Faik G. Bogdanov;Lily G. Svanidze;Irina I. Chochia;Roman G. Jobava

IEEE Transactions on Antennas and Propagation
Year: 2022 | Volume: 70, Issue: 10 | Journal Article |
Cited by: Papers (3)
A new method of moments (MoM)-based approach is proposed to efficiently solve broadband radiation and scattering problems on triangulated, quadrilateral, and mixed mesh geometries. This approach is based on expanding the total current on a conducting body at any desired frequency in terms of entire-domain hyperbasis functions (HBFs), calculated at only one frequency. These HBFs must be found as ei...Show More

MoM Solution of Broadband Radiation and Scattering Problems Based on Entire-Domain Hyperbasis Functions Approach

Faik G. Bogdanov;Lily G. Svanidze;Irina I. Chochia;Roman G. Jobava

Year: 2022 | Volume: 70, Issue: 10 | Journal Article |

Development of MoM-based Approach for Solution of Radiation and Scattering Problems Using CMA-based Hyper Basis Functions

Faik Bogdanov;Lily Svanidze;Irina Chochia;Roman Jobava

2021 IEEE 26th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)
Year: 2021 | Conference Paper |
Cited by: Papers (3)
In this paper, a new MoM-based approach is proposed for solving the radiation and scattering problem at any frequency by expansion of the total current in terms of hyper-basis functions (HBF), calculated at another frequency. These HBFs are to be found from solution of the generalized eigenvalue problem (GEP) at a single frequency. The developed approach has been demonstrated on the numerical mode...Show More

Development of MoM-based Approach for Solution of Radiation and Scattering Problems Using CMA-based Hyper Basis Functions

Faik Bogdanov;Lily Svanidze;Irina Chochia;Roman Jobava

Year: 2021 | Conference Paper |

Comparison of Computational Efficiencies of MoM Solutions for EFIE/CFIE Problems on Triangulated and Quadrilateral Geometries

Faik Bogdanov;Lily Svanidze;Irina Chochia;Roman Jobava

2021 IEEE 26th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)
Year: 2021 | Conference Paper |
Cited by: Papers (2)
This paper is intended to systematize the topology of quadrilaterals based on the previously proposed classical approach. We introduce an alternative representation of the generalized roof-top basis function (BF) for the method of moments (MoM) and consider the relationship between the edge-to-edge and face-to face calculation of matrix elements. Finally, we compare the computational efficiencies ...Show More

Comparison of Computational Efficiencies of MoM Solutions for EFIE/CFIE Problems on Triangulated and Quadrilateral Geometries

Faik Bogdanov;Lily Svanidze;Irina Chochia;Roman Jobava

Year: 2021 | Conference Paper |

High Speed Cables Modeling and Simulations

Irina Oganezova;Anna Gheonjian;Zviad Kutchadze;Badri Khvitia;Diana Eremyan;Roman Jobava;Wissem Yahyaoui;Xavier Bunlon

2020 IEEE XXVth International Seminar/Workshop Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)
Year: 2020 | Conference Paper |
Cited by: Papers (2)
This paper is devoted to the experimental validation of the modeling approach for studying the shielding cables and their properties for high speed systems. The simulation model is based on the multi-transmission line approach, and the novelty is in special validation of shield structure parameters using measurements of transfer impedance values according to IEC 62153-4-3 [1]. The methodology pres...Show More

High Speed Cables Modeling and Simulations

Irina Oganezova;Anna Gheonjian;Zviad Kutchadze;Badri Khvitia;Diana Eremyan;Roman Jobava;Wissem Yahyaoui;Xavier Bunlon

Year: 2020 | Conference Paper |

Hybridization of PMCHW Approach with Mitzner Surface Impedance Boundary Conditions for Treating Combined Geometries with Dielectrics and Thin 3D Material Sheets

Faik Bogdanov;Lily Svanidze;Irina Chochia;Roman Jobava

2020 IEEE XXVth International Seminar/Workshop Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)
Year: 2020 | Conference Paper |
This paper combines the PMCHW approach and Mitzner surface impedance boundary conditions (SIBC) to derive a generalized approach for treating combined geometries, including both dielectric parts and thin 3D material sheets. The developed approach is verified on a number of specific problems by comparison of the results with those obtained by well-known methods and measurements.Show More

Hybridization of PMCHW Approach with Mitzner Surface Impedance Boundary Conditions for Treating Combined Geometries with Dielectrics and Thin 3D Material Sheets

Faik Bogdanov;Lily Svanidze;Irina Chochia;Roman Jobava

Year: 2020 | Conference Paper |

Measurement and 3D Simulation Study of Shielding Properties of HV Connectors used in Electric and Hybrid Vehicles

Faik Bogdanov;Davit Imnadze;Anna Gheonjian;Irina Oganezova;Iskander Badzagua;David Karkashadze;Roman Jobava

2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE
Year: 2020 | Conference Paper |
Cited by: Papers (2)
This paper is devoted to the experimental validation of the 3D modeling approach for studying the shielding properties of high voltage (HV) connectors used in electric and hybrid vehicles with an arbitrary number, shape, size and location of apertures. The 3D simulation model is based on the method of moments (MoM), and novelty is in special implementation of Mitzner surface impedance boundary con...Show More

Measurement and 3D Simulation Study of Shielding Properties of HV Connectors used in Electric and Hybrid Vehicles

Faik Bogdanov;Davit Imnadze;Anna Gheonjian;Irina Oganezova;Iskander Badzagua;David Karkashadze;Roman Jobava

Year: 2020 | Conference Paper |

Source Reconstruction in Near-Field Scanning Using Inverse MoM for RFI Application

Hossein Rezaei;Javad Soleiman Meiguni;Morten Sørensen;Roman G. Jobava;Victor Khilkevich;Jun Fan;Daryl G. Beetner;David Pommerenke

IEEE Transactions on Electromagnetic Compatibility
Year: 2020 | Volume: 62, Issue: 4 | Journal Article |
Cited by: Papers (12)
The ability to predict the electric and magnetic fields generated by a component can solve many in-system interference problems before they occur. In this article, methods are presented to predict the high-frequency near electric and magnetic fields from a component using a method of moment approach. The current representation is estimated from a near electric-field scan by solving the electric fi...Show More

Source Reconstruction in Near-Field Scanning Using Inverse MoM for RFI Application

Hossein Rezaei;Javad Soleiman Meiguni;Morten Sørensen;Roman G. Jobava;Victor Khilkevich;Jun Fan;Daryl G. Beetner;David Pommerenke

Year: 2020 | Volume: 62, Issue: 4 | Journal Article |

Enhanced PEEC Model Based on Automatic Voronoi Decomposition of Triangular Meshes

Giga Gabriadze;Giorgi Chiqovani;Anna Gheonjian;Irina Oganezova;Alexander Demurov;Zviadi Kutchadze;Xavier Bunlon;Fatima Ajebbar;Roman Jobava

IEEE Transactions on Electromagnetic Compatibility
Year: 2020 | Volume: 62, Issue: 5 | Journal Article |
Cited by: Papers (8)
We present an enhanced partial element equivalent circuit (PEEC) model based on Voronoi decomposition of triangular meshes. A complex geometry is accurately represented by many surface triangles, while keeping the number of elements in the corresponding equivalent circuit far less than the number of triangles. To do this, the triangular geometry is automatically decomposed into surface partitions ...Show More

Enhanced PEEC Model Based on Automatic Voronoi Decomposition of Triangular Meshes

Giga Gabriadze;Giorgi Chiqovani;Anna Gheonjian;Irina Oganezova;Alexander Demurov;Zviadi Kutchadze;Xavier Bunlon;Fatima Ajebbar;Roman Jobava

Year: 2020 | Volume: 62, Issue: 5 | Journal Article |

Validation of MoM-based Solution of Waveguide Port Problem for Composite Structures Applied to Microwave Antenna and PCB Geometries

Faik G. Bogdanov;Irina Chochia;Lily Svanidze;Roman Jobava

2019 49th European Microwave Conference (EuMC)
Year: 2019 | Conference Paper |
Cited by: Papers (1)
This paper generalizes a waveguide port excitation problem on arbitrary composite geometries. An entire problem is formulated in terms of multiple equivalent subproblems for the equivalent currents in each specific region, which are found using the Method of Moments (MoM). The obtained solution takes into account the problem of material junctions between several material surfaces. The developed ap...Show More

Validation of MoM-based Solution of Waveguide Port Problem for Composite Structures Applied to Microwave Antenna and PCB Geometries

Faik G. Bogdanov;Irina Chochia;Lily Svanidze;Roman Jobava

Year: 2019 | Conference Paper |

Full Wave Simulation of a Vertically Polarized Transverse Electromagnetic Mode Cell

Teona Jobava;Irina Oganezova;Roman Jobava;Robert Kado

2019 XXIVth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)
Year: 2019 | Conference Paper |
Vertically Polarized Transverse Electromagnetic Mode (VTEM) cells may be used for immunity tests in vehicles. The tests are performed according to the ISO 11451-2 Standard. This work material describes a full wave approach for simulation of a VTEM cell. The investigation is performed in two stages. Firstly, the field uniformity and vertical polarization of the empty cell are verified. Secondly, th...Show More

Full Wave Simulation of a Vertically Polarized Transverse Electromagnetic Mode Cell

Teona Jobava;Irina Oganezova;Roman Jobava;Robert Kado

Year: 2019 | Conference Paper |

Radiation of Low Frequency Magnetic Field from High Voltage Powertrain Systems of Electric Vehicles

George Chiqovani;Irina Oganezova;Giga Gabriadze;Michael Kuehn;Marcel Messer;Roman Jobava

2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE
Year: 2019 | Conference Paper |
Cited by: Papers (1)
This paper describes the procedure for calculating low frequency magnetic fields radiated by high voltage (HV) powertrain systems of electric vehicles (EV). Simulations or measurements of common mode currents on HV cables are done in time domain. The spectrum of such signals contains many harmonics and 3D radiation calculations in frequency domain and might be computationally very costly. We propo...Show More

Radiation of Low Frequency Magnetic Field from High Voltage Powertrain Systems of Electric Vehicles

George Chiqovani;Irina Oganezova;Giga Gabriadze;Michael Kuehn;Marcel Messer;Roman Jobava

Year: 2019 | Conference Paper |

Investigation of Magnetic Permeability of Toroidal Cores

Zviad Kutchadze;Anna Gheonjian;Roman Jobava

2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE
Year: 2019 | Conference Paper |
Cited by: Papers (6)
This paper describes the procedure for extracting complex permeability for inductive toroidal cores using short coaxial sample holders in the frequency range between 100 Hz and 110 MHz. Extracting complex permeability from measured input impedance is performed based on the inductive behavior of the coaxial holder. Three numerical techniques based on non-uniform transmission line theory, frequency ...Show More

Investigation of Magnetic Permeability of Toroidal Cores

Zviad Kutchadze;Anna Gheonjian;Roman Jobava

Year: 2019 | Conference Paper |

Investigation of Possible EMC Interferences between Multi-Gig Communication Link and RF Applications in Vehicle

Sanaz Mortazavi;Detlef Schleicher;Diana Eremyan;Anna Gheonjian;Roman Jobava;Ali Sinai;Friedel Gerfers

2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE
Year: 2019 | Conference Paper |
Cited by: Papers (2)
Implementation of fully automated vehicles, car2-car, car-2-x, and advanced driver assistance systems requires a high-speed and reliable network. Automotive Ethernet technology is the suitable platform, which will provide data rates up to 10 Gbps. To ensure the safety of these gigabit networks the electromagnetic compatibility (EMC) investigations play a dominant role. This work presents the simul...Show More

Investigation of Possible EMC Interferences between Multi-Gig Communication Link and RF Applications in Vehicle

Sanaz Mortazavi;Detlef Schleicher;Diana Eremyan;Anna Gheonjian;Roman Jobava;Ali Sinai;Friedel Gerfers

Year: 2019 | Conference Paper |

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