TY - JOUR AU - Pintér, Bálint AU - Bingler, Arnold AU - Bilicz, Sándor AU - Pávó, József TI - Sensitivity analysis for the eddy current testing of carbon fiber reinforced plastic materials JF - INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS J2 - INT J APPL ELECTROM VL - 74 PY - 2024 IS - 4 SP - 397 EP - 403 PG - 7 SN - 1383-5416 DO - 10.3233/JAE-230142 UR - https://m2.mtmt.hu/api/publication/34832875 ID - 34832875 N1 - Export Date: 3 May 2024 Correspondence Address: Bingler, A.; Department of Broadband Infocommunications and Electromagnetic Theory, Hungary; email: bingler.arnold@vik.bme.hu AB - In this work, a parametric study is carried out on carbon fiber-reinforced plastic (CFRP) materials to investigate how the spatially varying fiber distribution influences the measured signal in an eddy current testing (ECT) configuration. The measurement setup was modeled using finite element method, while the fiber distribution is taken into account by an inhomogeneous anisotropic conductivity tensor. The study revealed a trade-off relation between the size of the ECT coil and the maximal dynamic range of the ECT signal, which contributes to the understanding of the connection between the fiber arrangement and the ECT signal and provides an opportunity for optimal ECT coil design. © 2024-IOS Press. All rights reserved. LA - English DB - MTMT ER - TY - CHAP AU - Kelmendi, Arsim AU - Csurgai-Horváth, László AU - Mohorčič, Mihael AU - Švigelj, Aleš AU - Javornik, Tomaž AU - Hrovat, Andrej TI - Large-Scale Site Diversity Experiment in Ljubljana and Budapest at Ka-band with Alphasat Satellite T2 - 2024 18th European Conference on Antennas and Propagation (EuCAP) PB - IEEE SN - 9788831299091 PY - 2024 SP - 1 EP - 5 PG - 5 DO - 10.23919/EuCAP60739.2024.10501541 UR - https://m2.mtmt.hu/api/publication/34825004 ID - 34825004 LA - English DB - MTMT ER - TY - JOUR AU - Makara, Árpád László AU - Csurgai-Horváth, László TI - Deep-Learning-Based ModCod Predictor for Satellite Channels JF - RADIOENGINEERING J2 - RADIOENGINEERING VL - 33 PY - 2024 IS - 1 SP - 182 EP - 194 PG - 13 SN - 1210-2512 DO - 10.13164/re.2024.0182 UR - https://m2.mtmt.hu/api/publication/34735352 ID - 34735352 AB - One of the significant challenges for satellite communications is to serve the ever-increasing demand for the use of finite resources. One option is to increase channel utilization, i.e., to transmit as much data as possible in a given frequency range. Since the channel is highly variable, primarily due to the ionosphere and troposphere, this goal can only be achieved by adaptively varying modulation and coding schemes. Most procedures and algorithms estimate the channel characteristics and descriptive quantities (e.g., signal-to-noise ratio). Ultimately, these procedures solve a regression problem. The resulting quantity is used as the basis for a decision process. Since valuation can also be subject to error, the decision mechanisms based on it must compensate and mitigate this error. The main element of the current research is to combine these two steps and solve them together using deep neural networks. The theoretical advantages of the method include that a better result can be achieved by having a joint estimation and decision process with a standard algorithm and cost function. The theoretical approach was tested with an actual protocol – Digital Video Broadcasting - Satellite - Second Generation – where we observed a significant improvement in channel utilization on previously recorded Alphasat satellite data. © (2024), (Czech Technical University in Prague). All Rights Reserved. LA - English DB - MTMT ER - TY - CHAP AU - Iványi, László Máté AU - Süle, Ádám AU - Zólomy, Attila Imre AU - Berceli, Tibor TI - Miniaturization of patch antennas using arrays of split ring resonator type unit cells T2 - 2nd Workshop on Intelligent Infocommunication Networks, Systems and Services PB - Budapest University of Technology and Economics CY - Budapest SN - 9789634219446 PY - 2024 SP - 43 EP - 47 PG - 5 DO - 10.3311/WINS2024-008 UR - https://m2.mtmt.hu/api/publication/34721120 ID - 34721120 LA - English DB - MTMT ER - TY - JOUR AU - Coskun, Aysu AU - Bilicz, Sándor TI - Analysis of Data-Driven Approaches for Radar Target Classification JF - COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING J2 - COMPEL PY - 2024 SN - 0332-1649 DO - 10.1108/COMPEL-11-2023-0576 UR - https://m2.mtmt.hu/api/publication/34543149 ID - 34543149 N1 - Funding Agency and Grant Number: Hungarian Scientific Research Fund [K-135307] Funding text: This research is supported by the Hungarian Scientific Research Fund under Grant K-135307. LA - English DB - MTMT ER - TY - GEN AU - Hilt, Attila TI - Iványi László Máté: Kisméretű antennák tulajdonságainak javítása metaanyagok segítségével c. diplomatervének bírálata PY - 2024 SP - 1 EP - 5 PG - 5 UR - https://m2.mtmt.hu/api/publication/34481515 ID - 34481515 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Bíró, Oszkár AU - Testoni, P. AU - Portone, A. TI - An Improved 3D MHD Equilibrium Formulation JF - IEEE TRANSACTIONS ON MAGNETICS J2 - IEEE T MAGN VL - 60 PY - 2024 IS - 3 PG - 4 SN - 0018-9464 DO - 10.1109/TMAG.2023.3335178 UR - https://m2.mtmt.hu/api/publication/34445370 ID - 34445370 N1 - Department of Broadband Infocommunications and Electromagnetic Theory, Budapest University of Technology and Economics, Budapest, Hungary Fusion for Energy, Barcelona, Spain Export Date: 20 December 2023 CODEN: IEMGA AB - Three fully three-dimensional finite element formulations of magnetohydrodynamic (MHD) plasma equilibrium are presented. The first one is based on the curl of the equilibrium equation, but it fails since it does not take account of the component of the current density parallel to the magnetic flux density and does not include the pressure as a variable. Two new formulations are introduced which remedy these shortcomings. One of them turns out to be too ill-conditioned to be used. Finally, a novel approach based on a current vector potential to represent the current density is shown to be stable and is validated by showing that it converges to the solution obtained by a previously authenticated 2D method for an axisymmetric problem. IEEE LA - English DB - MTMT ER - TY - JOUR AU - Csathó, Botond Tamás AU - Badics, Zsolt AU - Pávó, József AU - Horváth, Bálint Péter TI - Fast Numerical Analysis of Metasurfaces by Characteristic Basis Functions in EFIE Framework JF - IEEE TRANSACTIONS ON MAGNETICS J2 - IEEE T MAGN VL - 60 PY - 2024 IS - 3 PG - 4 SN - 0018-9464 DO - 10.1109/TMAG.2023.3333961 UR - https://m2.mtmt.hu/api/publication/34378804 ID - 34378804 N1 - Export Date: 14 December 2023 CODEN: IEMGA Funding Agency and Grant Number: Hungarian Scientific Research Fund Funding text: No Statement Available AB - Metasurface (MTS)-based reconfigurable intelligent surfaces (RISs) are able to actively control the reflection and refraction patterns on a surface to create a programmable and reconfigurable wireless propagation environment. A fast electric field integral equation (EFIE) formulation is developed here to model MTS-field interactions for RISs. The novelty of the formulation is that it utilizes characteristic basis functions (CBFs) designed specifically for approximating surface current densities on MTSs, thereby significantly reducing the necessary number of unknowns and decreasing the solution time compared with employing the standard Method of Moments technique with Rao-Wilton-Glisson (RWG) surface basis functions. In this work, we validate the novel numerical technique and demonstrate the substantial improvement in numerical performance utilizing a 2-D illustrative structure. LA - English DB - MTMT ER - TY - JOUR AU - Bingler, Arnold AU - Pinter, B. AU - Marak, K. AU - Bilicz, Sándor AU - Csornyei, M. TI - Surrogate Model-Based Parameter Identification for 3-D Modeling of Common Mode Chokes JF - IEEE TRANSACTIONS ON MAGNETICS J2 - IEEE T MAGN VL - 60 PY - 2024 IS - 3 PG - 4 SN - 0018-9464 DO - 10.1109/TMAG.2023.3322036 UR - https://m2.mtmt.hu/api/publication/34231286 ID - 34231286 N1 - Budapest University of Technology and Economics, Faculty of Electrical Engineering and Informatics Department of Broadband Infocommunications and Electromagnetic Theory, Budapest, Hungary Department of Electromagnetic Field, Czech Technical University in Prague, Czechia Robert Bosch Kft, Budapest, Hungary Export Date: 2 November 2023 CODEN: IEMGA Funding Agency and Grant Number: Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the KDP-2020 Funding Scheme Funding text: No Statement Available AB - In this article, we propose a method to provide a wideband 3-D model of a toroidal-shaped common mode choke (CMC) and extract the complex permeability curves of the toroid core. The overlapping turns of the CMC's coils are treated by equidistant turns and external capacitors, while the complex, frequency-dependent permeability is modeled by a second-order general dispersion model. Obtaining the optimal capacitance values and dispersion model parameters is addressed as an inverse problem that leads to a minimization of the misfit between the simulated-with 3-D finite element (FE) method-and measured transfer scattering parameter curves of the CMC. The computational cost is reduced by a polynomial chaos kriging (PCK) surrogate model (SM) that is built using a small sampling design and is subsequently used as a low-cost substitute for the FE model to support the great number of model evaluations that the inverse problem implies. LA - English DB - MTMT ER - TY - CHAP AU - Marak, K. AU - Kracek, J. AU - Bingler, Arnold TI - Optimization and design of versatile antenna arrays T2 - 2023 24th International Conference on the Computation of Electromagnetic Fields (COMPUMAG) PB - IEEE CY - Piscataway (NJ) SN - 9798350301052 PY - 2023 PG - 2 DO - 10.1109/COMPUMAG56388.2023.10411768 UR - https://m2.mtmt.hu/api/publication/34726807 ID - 34726807 N1 - Czech Technical University in Prague, Department of Electromagnetic Field, Czech Republic Budapest University of Technology and Economics, Faculty of Electrical Engineering and Informatics, Department of Broadband Infocommunications and Electromagnetic Theory, Hungary Conference code: 196970 Export Date: 8 March 2024 Correspondence Address: Marak, K.; Czech Technical University in Prague, Czech Republic; email: karolmar@fel.cvut.cz Funding details: European Cooperation in Science and Technology, COST Funding details: Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT, LTC20012 Funding text 1: ACKNOWLEDGEMENT This work was supported by the Ministry of Education, Youth and Sports of the Czech Republic (Program INTER-EXCELLENCE, Subprogram INTER-COST, Project LTC20012) and the COST – European Cooperation in Science and Technology (COST Action CA18223 SyMat). AB - In this paper, we investigate the synthesis of antenna arrays capable of producing different radiation patterns, which can also be easily manufactured using planar Printed Circuit Board (PCB) technology. To this end, we employ algorithms using simultaneous placement techniques of antennas into non-regular arrays. We also inspect the effect of symmetries in the specification upon the symmetries of the array's geometry. The arrays are simulated via the Finite Element Method (FEM). Through numerical examples, we illustrate the scope and convergence of the method. Applications of interest include circularly polarized patterns, since the algorithm can handle the rotation as well as translation of the antenna elements, in addition to broadband systems, as the method is capable of characterizing the performance of arrays at multiple frequencies. © 2023 IEEE. LA - English DB - MTMT ER -