Gadelmavla, Diaa
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Fawzy, D
Gadelmavla, Dıaa
Fawzy, Diaa
Fawzy, Diaa E.
Fawzy, DE
Fawzy, D. E.
Gadelmavla, Dıaa
Fawzy, Diaa
Fawzy, Diaa E.
Fawzy, DE
Fawzy, D. E.
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Email Address
diaa.gadelmavla@ieu.edu.tr
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05.01. Aerospace Engineering
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Current Staff
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Sustainable Development Goals
10
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0
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14
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16
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17
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11
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1
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9
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4
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2
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0
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1
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13
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7
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4
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8
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0
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3
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2
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15
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4
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6
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5
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12
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Documents
71
Citations
591
h-index
15
Documents
30
Citations
351
Scholarly Output
68
Articles
24
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25/671
Supervised MSc Theses
4
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0
WoS Citation Count
201
Scopus Citation Count
362
WoS h-index
8
Scopus h-index
11
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0
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0
WoS Citations per Publication
2.96
Scopus Citations per Publication
5.32
Open Access Source
18
Supervised Theses
4
| Journal | Count |
|---|---|
| Monthly Notıces of the Royal Astronomıcal Socıety | 8 |
| Proceedings - 2023 10th International Conference on Electrical and Electronics Engineering, ICEEE 2023 | 4 |
| Astrophysıcs And Space Scıence | 4 |
| 2022 9Th Internatıonal Conference on Electrıcal And Electronıcs Engıneerıng (Iceee 2022) | 3 |
| 2023 International Telecommunications Conference, ITC-Egypt 2023 | 3 |
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68 results
Scholarly Output Search Results
Now showing 1 - 10 of 68
Master Thesis Development of Millimeter Wave System Components for 5g/6g Wireless Networks(İzmir Ekonomi Üniversitesi, 2022) Cengiz, Mehmet Faruk; Gadelmavla, DıaaBu tez, boşluk dalga kılavuzu teknolojisine dayalı 5G ve mm dalga uygulamaları için üç sistem bileşeninin tasarımına ayrılmıştır. Üç bantlı bant geçiren filtre, sırasıyla 32,32 GHz, 35,75 GHz ve 38,12 GHz rezonans frekanslarına ve yaklaşık 0,6 dB, 1,1 dB ve 0,9 dB düşük ekleme kayıplarına sahip Ka-bant uygulamaları için tasarlanmıştır. V/W frekans bantlarındaki uygulamalar için dört portlu MIMO anten geliştirilmiştir. 72,7 ile 79,5 GHz aralığı arasındaki otomotiv radar ve uydular arası uygulamalarda kullanıma uygundur. D-bant uygulamaları için 140,9 ile 157,7 GHz aralığında yeni 4 x 1 dikdörtgen yarık anten dizisi geliştirilmiştir. Genel verimlilik %95 civarındadır ve maksimum kazanç yaklaşık 10 dBi'dir. DGS izolasyon geliştirme tabanlı dört portlu MIMO anteni, D-bandı uygulamaları için tasarlanmıştır. Empedans bant genişliği 148 GHz'den 161,7 GHz'e kadar uzanır. Farklı DGS geometrilerinin kullanılması kuplaj azaltmalarında etkili olup bu geometrilerinden elde edilen en yüksek kuplaj seviyesi -26,4 dB'dir, en düşük seviye yaklaşık -96 dB'ye ulaşır ve maksimum gerçekleşen kazanç 7,97 dBi'dir. 11,94 ile 16,91 GHz aralığındaki Ku-bant uygulamaları için özgün, ayarlanabilir metayüzey tabanlı kompakt UWB hibrit kuplör geliştirildi. Kuplör, 2,6 ile 4,8 dB arasında sürekli olarak ayarlanabilen büyüklük sunarken, faz farkları 77° ila 105° aralığındadır ve %34,45'lik kesirli bant genişliğine (FBW) sahiptir. Önerdiğimiz tasarım, Ku bandı/mm-bant aralığındaki ilk ayarlanabilir faz kuplörüdür.Article Citation - WoS: 3Citation - Scopus: 3Theoretical Basal Ca Ii and Mg Ii Fluxes for Late-Type Stars: Results From Acoustic Wave Spectra With Time-Dependent Ionization and Multilevel Radiation Treatments(Oxford Univ Press, 2015) Fawzy, Diaa E.Computations of chromospheric models and the resulting spectral line emission fluxes are presented for late-type stars exhibiting very low level of chromospheric activity, referred to as a basal flux stars or low activity stars. The computations are self-consistent, and consider the entire acoustic wave energy spectra generated in the stellar convection zones. We consider multilevel atomic models, take into account departures from local thermodynamic equilibrium and also consider the time-dependent ionization processes of hydrogen. We employ the new finding of the mixing-length parameter alpha = 1.8. The Ca II H+K and Mg II h+k line fluxes are computed assuming pseudo-partial redistribution. The results show the importance of time-dependent ionization in modelling the middle and high chromospheres. Models without considering time-dependent ionization overestimate the emitted Ca II fluxes by factors between 1.1 and 5.6 for F8V and M0V stars, respectively, while factors between 1.8 for G0V and 17.4 for M0V stars have been obtained for the MgII fluxes. The theoretically computed basal fluxes in Ca II and MgII, respectively, follow simple linear formulae depending on the effective temperature log T-eff. The obtained results for Ca II fluxes show reasonable agreement with observations.Conference Object Citation - Scopus: 1Re-Configurable Power Divider Based on Printed Ridge Gap Waveguide Technology(Institute of Electrical and Electronics Engineers Inc., 2023) Ali, M.M.M.; Shams, S.I.; Elsaadany, M.; Fawzy, Diaa E.; Allam, A.M.M.A.; Abbas, M.A.; Abo, Sree, M.F.Future Millimeter Wave (mmWave) band communication systems are predicted to be involved in different and diverse fields. These systems will be smart with high speed that enable the emergence of fundamental and advanced services. In order to realize these systems we need the use of reconfigurable microwave components implemented based on modern guiding structures. Power dividers are considered one of the essential components for the feeding antenna system. In this paper, Re-configurable Printed Ridge Gap Waveguide (RPRGW) is deployed to implement a power divider. The simulated results show a wide bandwidth of 16 % at 38.5 GHz. These results demonstrate the merit of using this technology to implement various microwave components suitable for smart communication systems. © 2023 IEEE.Article Citation - WoS: 26Citation - Scopus: 28The Secret Lives of Cepheids: Delta Cep-The Prototype of a New Class of Pulsating X-Ray Variable Stars(Iop Publishing Ltd, 2017) Engle, Scott G.; Guinan, Edward F.; Harper, Graham M.; Cuntz, Manfred; Evans, Nancy Remage; Neilson, Hilding R.; Fawzy, Diaa E.From our Secret Lives of Cepheids program, the prototype Classical Cepheid, delta Cep, is found to be an X-ray source with periodic pulsation-modulated X-ray variations. This finding complements our earlier reported phasedependent FUV-UV emissions of the star that increase similar to 10-20 times with highest fluxes at similar to 0.90-0.95 phi, just prior to maximum brightness. Previously delta Cep. was found as potentially X-ray variable, using XMM-Newton observations. Additional phase-constrained data were secured with Chandra near X-ray emission peak, to determine if the emission and variability were pulsation-phase-specific to delta Cep. and not transient or due to a possible coronally active, cool companion. The Chandra data were combined with prior XMM-Newton observations, and were found to very closely match the previously observed X-ray behavior. From the combined data set, a similar to 4 increase in X-ray flux is measured, reaching a peak L-X = 1.7 x 10(29) erg s(-1) near 0.45 phi. The precise X-ray flux phasing with the star's pulsation indicates that the emissions arise from the Cepheid and not from a companion. However, it is puzzling that the maximum X-ray flux occurs similar to 0.5 phi (similar to 3 days) later than the FUV-UV maximum. There are several other potential Cepheid X-ray detections with properties similar to delta Cep, and comparable X-ray variability is indicated for two other Cepheids: beta Dor. and V473 Lyr. X-ray generating mechanisms in delta Cep. and other Cepheids are discussed. If additional Cepheids are confirmed to show phased X-ray variations, then delta Cep. will be the prototype of a new class of pulsation-induced X-ray variables.Conference Object Citation - WoS: 3Citation - Scopus: 5Interfacing Wideband Amplifiers Using Ridge Gap Waveguide for Mm-Wave Systems(Institute of Electrical and Electronics Engineers Inc., 2020) Shams S.I.; Ali M.M.M.; Sebak A.; Elsaadany M.; Gagnon G.; Fawzy D.E.; Allam A.M.M.A.The 6G race has already begun, and many countries and giant corporations started directing significant efforts and funds towards the development of the future technology. The 6G standard is expected to migrate to higher bands of frequencies to support wider bandwidth. Through this wide bandwidth, it will be feasible to serve the expected massive number of users and future applications, such as virtual reality and HD realtime transmission. One major problem in high frequency ranges, such as mm-wave bands, is the high signal attenuation, which can be compensated through more efficient amplifier systems. In this paper, we propose a wideband amplifier design fed through a Ridge Gap Waveguide line. The proposed design has many advantages inherited from the host guiding structure. The signal is carried by a Quasi-TEM signal, which minimizes the signal distortion. Also, the structure acts as a large heat sink, which minimizes the operating temperature. As a result, the expected added noise by the proposed amplifier shall be minimal. © 2020 IEEE.Conference Object Citation - WoS: 3Citation - Scopus: 13Parametric Study of Different Shapes-Slotted Substrate Integrated Waveguide for Wideband Applications(IEEE Computer Society, 2019) Nakmouche M.F.; Taher H.; Fawzy D.E.; Kahraman G.On the way to design Substrate Integrated Waveguide Bandpass Filter (SIW-BPF) for wideband applications a parametric study of the slot geometry etched on a SIW structure is the preliminary step to design such filter. Three different structures, namely, H-Slotted, T- Slotted, and U-Slotted SIW is investigated in order to examine the effect of altering different geometrical parameter of the unit on its response. H-Slotted Electromagnetic Band Gap (EBG) shows the highest Fractional Band Width (FBW), which is about 90% compared to the others, consequently it could be used to design a wideband SIW-BPF. © 2018 IEEE.Conference Object Citation - WoS: 7Citation - Scopus: 23Low Profile Dual Band H-Slotted Dgs Based Antenna Design Using Ann for K/Ku Band Applications(IEEE, 2021) Nakmouche, Mohammed Farouk; Allam, A. M. M. A.; Fawzy, Diaa E.; Lin, Ding BingIn this manuscripts, H-slotted DGS based antenna configuration for K/Ku applications is designed, fabricated and measured using ROHDE & SCHWARZ ZVB20 network analyzer. Simulation studies are performed using Electromagnetic Simulation Software CST Studio Suite. Moreover, a development of Artificial Neural Networks (ANN) model is implemented based on feed-forward back-propagation and Bayesian regularization learning algorithm. The optimal position for H-slotted DGS antenna performance is predicted in terms of reflection coefficient and resonance frequency. The antenna is implemented on Rogers RT/Duroid 5880 with relative dielectric constant of 0.0009 and thickness 0.38 mm. It operates at both 15.04 GHz (from 14.87 GHz to 15.208 GHz) and 24.77 GHz (from 24.404 GHz to 25.137 GHz). The antenna achieves gains of 5.59 dB and 6.10 dB and efficiencies of 87 % and 80 % at both frequencies, respectively. The simulation using CST, predicted ANN and measurement results are in good agreement.Conference Object Citation - Scopus: 1Beamforming Network for 5g Applications(Institute of Electrical and Electronics Engineers Inc., 2023) Raafat, M.A.; Allam, A.M.M.A.; Helala, M.A.; Ghanem, M.G.; Fawzy, Diaa E.; Abbas, M.A.; Abo, Sree, M.F.This paper is devoted to the design, analysis, and implementation of switched beamforming network operating at 5.2 GHz for 5G applications. It is intended to launch four beams. The Butler matrix feeding network is presented to electronically switch the beam in the desired direction. This work achieves a good approach to alleviate the problem of cross-over implementation and fabrication. A Four-element array of printed antennas is designed and fabricated. The network and array are implemented on Rogers RT/duroid 5880 substrate with a relative permittivity of 2.2 and a thickness of 1.04 mm. The different scattering parameters are simulated using both ADS and CST which conduct good agreement between the simulated and measured results. © 2023 IEEE.Conference Object Developement of 4-Ports Mimo Cp Antennas for Radar Applications(Institute of Electrical and Electronics Engineers Inc., 2024) Said, A.; Allam, A.M.M.A.; Fawzy, D.E.; Sahin, O.N.This paper introduces a printed four-port MIMO antenna with advantages such as compact size, excellent MIMO diversity performance, and simple geometry for radar applications at 10 GHz. It is small size makes it suitable for integrating various telecommunication devices for multiple applications, with a prototype measuring 32 mm × 32 mm × 4.3 mm. The mutual coupling between the individual elements significantly im-pacts the MIMO system's diversity properties, and an effective technique of orthogonally positioning the antenna elements to each other increases their isolation resulting in superior MIMO diversity performance. It is evaluated through S-parameters and MIMO diversity parameters to ensure its suitability for future radar applications. It is validated through measurements, and the results showed a good match between simulated and measured results. The different diversity parameters such as (Envelope Correlation Coefficient (ECC), Diversity Gain (DG), Channel Capacity Loss (CCL), Multiplexing Efficiency (ME), Total Active Reflection Coefficient (TARC) are simulated and measured. It is found that all values are within the standard norms which indicates the availability for MIMO radar applications. © 2024 IEEE.Conference Object Citation - WoS: 8Citation - Scopus: 12A Novel 5g Wideband Metamaterial Based Absorber for Microwave Energy Harvesting Applications(IEEE, 2021) Akarsu, Gokberk; Nakmouche, Mohammed Farouk; Fawzy, Diaa E.; Allam, A. M. M. A.; Baskoy, Kadir; Cengiz, Mehmet FarukThis paper proposes a novel design of a compact and thin metamaterials (MMs) based wideband absorber aiming at specific microwave energy harvesting for 5G applications. The developed unit cell is obtained by combining two letters-like patches printed on a grounded dielectric substrate. The developed operating band is achieved based on the superposition of the two-resonances generated by the two letters. The simulations are based on Rogers RT5880 (thickness of 1.575 mm, dielectric constant of epsilon r=2.2, loss tangent of tan delta=0.009) and FR-4 substrates (thickness of 1.2 mm dielectric constant of epsilon r=4.3, loss tangent of tan delta=0.02). The obtained results show a wide 10 dB absorption bandwidth in the frequency range between 18 GHz and 30 GHz with absorptivity close to 99% for normal and oblique incident up top to 30 degrees in the case of Rogers RT5880. An absorptivity rate of 96% is obtained for the cased of FR-4 because of high dielectric losses. The obtained results are reasonable compared to other studies in the literatures.
