TY - CHAP AU - Hilt, Attila TI - Feasibility of D-band Fixed Radio Links for 5G and Beyond Access Networks T2 - 2024 34th International Conference Radioelektronika (RADIOELEKTRONIKA) PB - IEEE SN - 9798350362169 PY - 2024 SP - 1 EP - 6 PG - 6 DO - 10.1109/RADIOELEKTRONIKA61599.2024.10524063 UR - https://m2.mtmt.hu/api/publication/34856308 ID - 34856308 LA - English DB - MTMT ER - TY - CHAP AU - Hilt, Attila AU - Farkasvölgyi, Andrea AU - Iványi, László Máté TI - Experimental Verification of Transmittance and Harmonics in External Optical Intensity Modulation T2 - 2024 34th International Conference Radioelektronika (RADIOELEKTRONIKA) PB - IEEE SN - 9798350362169 PY - 2024 SP - 1 EP - 5 PG - 5 DO - 10.1109/RADIOELEKTRONIKA61599.2024.10524077 UR - https://m2.mtmt.hu/api/publication/34852488 ID - 34852488 LA - English DB - MTMT ER - TY - JOUR AU - Bakondi, Tamás TI - Simulation of Eddy Current Losses in Twisted Wires JF - PERIODICA POLYTECHNICA-ELECTRICAL ENGINEERING AND COMPUTER SCIENCE J2 - PERIOD POLYTECH ELECTR ENG COMP SCI VL - 68 PY - 2024 IS - 2 SP - 149 EP - 156 PG - 8 SN - 2064-5260 DO - 10.3311/PPee.22800 UR - https://m2.mtmt.hu/api/publication/34846761 ID - 34846761 N1 - Export Date: 10 May 2024 Correspondence Address: Bakondi, T.; Department of Broadband Infocommunications and Electromagnetic Theory, Műegyetem rkp. 3., Hungary; email: bakondi.tamas@edu.bme.hu AB - Twisted wires made of insulated strands, known as stranded conductors or litz wires, are used in various areas where the eddy current loss within the wire needs to be reduced. These areas include induction heating, resonance-based wireless energy transfer, and certain radio frequency devices. Some litz wires consist of thousands of individual conductor strands that are twisted together in multiple stages, creating a hierarchical bundle structure. Computer simulations (typically using finite element analysis) are used in the optimal design of the bundle structure. However, detailed three-dimensional models are computationally demanding. In this work, a two-dimensional finite element model was presented for simulating the eddy current loss in cables made of twisted wires. The key element of the model is considering the bundle structure (generally referred to as 3D configuration conditions) within the cross-sectional model domain. The accuracy of the proposed model is tested against 3D finite element simulations. The new method is shown to be accurate, and its computational cost is by orders of magnitude lower than that of 3D models. © 2024 Budapest University of Technology and Economics. All rights reserved. LA - English DB - MTMT ER - TY - JOUR AU - Humad, Yasir AU - Dudás, Levente TI - Resonant Radar Reflector On VHF / UHF Band Based on BPSK Modulation at LEO Orbit by MRC-100 Satellite JF - INFOCOMMUNICATIONS JOURNAL J2 - INFOCOMM J VL - 16 PY - 2024 IS - 1 SP - 26 EP - 34 PG - 9 SN - 2061-2079 DO - 10.36244/ICJ.2024.1.4 UR - https://m2.mtmt.hu/api/publication/34841513 ID - 34841513 AB - This paper presents a novel method for identify ing and tracking PocketQube satellites: the MRC-100 satellite is a model, and this method is based on a resonant radar reflec tor. The resonant reflector’s basic concept is that the resonant reflector uses a VHF/UHF communication subsystem antenna; there is no radiated RF signal, which means the power con sumption is only some Milliampere (mA). The continuous wave (CW) illuminator RF source is on the ground, and the onboard antenna receives the CW RF signal from the Earth. The micro controller (uC) periodically switches PIN diode forming BPSK modulated signal reflection so that another Earth station can receive the backscattered Binary Phase Shift Keying (BPSK) modulated signal. Also, it can detect the satellite if the ground station receiver can use a matched filter like a correlation re ceiver. If the ground station receiver knows the BPSK code of the satellite, it can detect it. If not, there is no way to detect the satellite. This method is similar to Radio Frequency Identifica tion (RFID) applications, but the reader is the ground station, and the tag is the satellite. LA - English DB - MTMT ER - 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 - EurAAP CY - Pisa SN - 9788831299091 PY - 2024 PG - 5 DO - 10.23919/EuCAP60739.2024.10501541 UR - https://m2.mtmt.hu/api/publication/34825004 ID - 34825004 N1 - Ansys; CADFEM; Dassault Systemes; et al.; Huawei; Microwave Vision Group (MVG) Jozef Stefan Institute, Ljubljana, Slovenia Budapest University of Technology and Economics, Budapest, Hungary ONERA, DEMR, Université de Toulouse, Toulouse, F-31055, France Conference code: 199134 Export Date: 17 May 2024 Funding details: Javna Agencija za Raziskovalno Dejavnost RS, ARRS, P2-0016 Funding details: Javna Agencija za Raziskovalno Dejavnost RS, ARRS Funding text 1: This work was partially funded by the Slovenian Research Agency (grant no. P2-0016). AB - High throughput satellite communication systems, need to utilize less congested high frequency bands, such as Ka- and Q-bands and above with a large available radio channel bandwidth. However, the disadvantage of radio wave propagation at these frequencies is the increased attenuation and impairment caused from tropospheric phenomena, in particular by rainfall. Site diversity is an efficient technique to mitigate the attenuation due to rain. In this paper, we present the performance evaluation of the large-scale dual site diversity system based on the long-term beacon signal measurement of geosynchronous Alphasat satellite at 19.701 GHz between the Earth stations in Ljubljana and Budapest. The statistical analysis of one-year measurement of rain attenuation of the site diversity system is presented. The results show that the mitigation of the rain attenuation in site diversity is significant. © 2024 18th European Conference on Antennas and Propagation, EuCAP 2024. All Rights Reserved. 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 -