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Tbilisi, Georgia

Bogdanov F.,EMCoS Ltd. | Bogdanov F.,Georgian Technical University | Jobava R.,EMCoS Ltd. | Jobava R.,Tbilisi State University | Bzhalava A.,EMCoS Ltd.
8th European Conference on Antennas and Propagation, EuCAP 2014 | Year: 2014

In this paper, a conventional loop-star approach is generalized on mixed multiple geometries composed of metal surfaces, wires, dielectrics and thin material sheets. A hybridized MoM solver to jointly handle these geometry elements is developed and applied for analysis of specific electromagnetic (EM), electromagnetic interference (EMI), compatibility (EMC) and safety (EMS) problems. The developed approach is validated by comparison of simulated results for particular geometries with those obtained by other approaches. Application of it to practical EMC and EMS problems, such as inductive charging in electrical and hybrid vehicles (EV and HV), is demonstrated. © 2014 European Association on Antennas and Propagation. Source


Bogdanov F.,EMCoS Ltd. | Bogdanov F.,Georgian Technical University | Jobava R.,EMCoS Ltd. | Jobava R.,Tbilisi State University | Chochia I.,EMCoS Ltd.
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2013

Surface impedance boundary conditions (SIBC) by Mitzner are implemented into the Method of Moments (MoM) to simulate arbitrary shape open thin 3D material sheets hybridized with wires and other geometry elements. This approach is validated by comparison of simulated results with analytical approaches and measurements. Application of the developed approach to automotive EMI problems is demonstrated. © 2013 IEEE. Source


Gabriadze G.,Tbilisi State University | Bodganov F.,Georgian Technical University | Tsereteli P.,The University of Georgia | Jobava R.,EMCoS Ltd. | Tskhovrebashvili V.,EMCoS Ltd.
Proceedings of International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, DIPED | Year: 2014

This paper describes the application of ACA (Adaptive Cross Approximation) algorithm for acceleration of MoM solution of large scale radiation problems. System of linear equations is solved using iterative solution and ACA is used to reduce required memory for matrix storage and speed up matrix-vector-product operation. To demonstrate applicability and performance of described technique, two numerical experiments are presented: a) calculation of radiation pattern of Magellan spacecraft high gain reflector antenna operating at 3GHz and b) calculation of radiation pattern of Wi-Fi antenna mounted on the roof of the vehicle, operating at 5.9GHz frequency. We show that ACA calculation is much faster than direct solution, while accuracy is quite acceptable. © 2014 IEEE. Source


Bogdanov F.G.,EMCoS Ltd. | Bogdanov F.G.,Georgian Technical University | Karkashadze D.D.,EMCoS Ltd. | Karkashadze D.D.,Tbilisi State University | And 9 more authors.
IEEE Transactions on Electromagnetic Compatibility | Year: 2010

In this paper, based on the refined modified image theory, an equivalent model of the layered glass antenna structure is suggested and validated by comparison with Sommerfelds traditional solution to Greens function. Using this model, a hybrid method of moments (MoM) scheme is derived to handle the full MoM geometries including finite-sized and curved glass antenna structures. This scheme is validated by comparison of the measured and simulated electromagnetic compatibility (EMC) characteristics of the special simplified models and a full vehicle model with a realistic rear window glass antenna. © 2010 IEEE. Source


Bogdanov F.,EMCoS Ltd. | Bogdanov F.,Georgian Technical University | Jobava R.,EMCoS Ltd. | Jobava R.,Tbilisi State University | And 3 more authors.
Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012 | Year: 2012

In this work, the loop-star and loop-tree basis function approach is applied to multiple, complicated and mixed surface and wire geometries, including a number of separate surfaces (open and close), with handles and holes, a number of wires (open and looped) and surface to wire junctions, being in free space, over ground plane or over/in a layered medium. This approach is also extended to considering printed structures by modifying the hybrid MoM and multilayered Green's function approach. © 2012 IEEE. Source

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