Browsing by Author "Nakmouche, Mohammed Farouk"

Now showing 1 - 15 of 15

Citation - WoS: 11
Citation - Scopus: 15
Design and Development of a Graphene-Based Reconfigurable Patch Antenna Array for Thz Applications
(Walter De Gruyter Gmbh, 2023) Lamri, Isam Eddine; Ahmad, Sarosh; Nakmouche, Mohammed Farouk; Ghaffar, Adnan; Fawzy, Diaa E.; Allam, A. M. M. A.; Ali, Esraa Mousa; Eddine Lamri, Isam; Alibakhshikenari, Mohammad
This paper presents a graphene-based antenna array for terahertz (THz) applications. The suggested antenna array has four radiating square shaped patches fed by a coplanar waveguide (CPW) technique. The proposed antenna array operates at the three frequencies with operational bandwidths of 1.173-1.210 THz (at 1.19 THz), 1.270-1.320 THz (at 1.3 GHz), and 1.368-1.346 THz (at 1.4 GHz). The total area of the antenna array is reported as 1000 x 1000 mu m(2), printed on a Silicon substrate with a thickness of 20 mu m and a dielectric constant of epsilon( r ) = 11.9. To enhance the structure's performance and optimize the feeding network, a parametric analysis was performed using the FDTD technique. Furthermore, the key properties of the proposed antenna array, such as resonance frequency, peak gain, and radiation efficiency, may be changed by adjusting the chemical potentials of the graphene in the antenna array. The use of graphene's chemical potential tuneability yields exceptional results comparing to the recent research outputs, with a peak gain and radiation efficiency of 10.45 dB and 70%, respectively. These results show the performance of the suggested design for constructing antenna arrays for use in THz applications.
Citation - WoS: 3
Design of Novel Uwb 4-Element Mimo Microstrip Patch Antenna for Sub-6 Ghz 5g Applications
(IEEE, 2021) Lamri, Isam Eddine; Mansoul, Ali; Nakmouche, Mohammed Farouk; Belattar, Mounir
The aim of this paper is the development of a 2x2 MIMO antenna that is capable of covering the whole UWB spectrum of 3.1 - 10.6 GHz. The design starts by implementing a single element of Printed Circular Disc Monopole (PCDM) antenna on a 1.6 mm thick FR-4 substrate having a relative permittivity of 4.4. A parametric analysis, as well as slots insertion, are performed based on Finite Difference Time Domain Analysis (FDTD) to improve the structure performance related to the operating bandwidth. Concerning the MIMO antenna structure, a four-element configuration is investigated. Over the intended frequency band, the isolation is greater than 15 dB. The Envelope Correlation Coefficient (ECC), Diversity Gain (DG), and Channel Capacity Loss (CCL) have all been shown to improve diversity performance and are determined to be within acceptable limits. A network analyzer is used to measure the antenna structure once it is constructed. In terms of scattering characteristics and spectral efficiency, the measured and simulated are in good agreement.
Citation - Scopus: 2
Design of Triple-Band Bandpass Filter Using Inverted Microstrip Ridge Gap Waveguide for Ka-Band Applications
(IEEE, 2022) Cengiz, Mehmet Faruk; Nakmouche, Mohammed Farouk; Fawzy, Diaa E.; Allam, A. M. M. A.; Akarsu, Gokberk; Taher, Hany
In this paper, a triple-band inverted microstrip Ridge Gap Waveguide (RGW) filter is designed using a double octagonal ring resonator (RR) with corner cuts. The design parameters are optimized using the Finite Difference Time Domain (FDTD) method (CST studio simulator). The filter is implemented on Rogers RT5880 (epsilon(r) =2.2, thickness of 0.787 mm and loss tangent tan delta = 0.0009). It is selected because of its low losses at high frequencies. The proposed design operates within the Ka frequency band (27-40 GHz), with resonance frequencies of 32.32 GHz, 35.75 GHz, and 38.12 GHz. The return losses reach levels of about -35 dB, -25 dB, and -32 dB for the three bands, respectively. The filter exhibits a low insertion losses of about 0.6 dB, 1.1 dB, and 0.9 dB at the three resonant frequencies, respectively.
Citation - WoS: 15
Citation - Scopus: 31
Development of a High Gain Fss Reflector Backed Monopole Antenna Using Machine Learning for 5g Applications
(Electromagnetics Academy, 2021) Nakmouche M.F.; Allam A.M.M.A.; Fawzy D.E.; Lin D.-B.; Nakmouche, Mohammed Farouk; Fawzy, Diaa E.; Allam, Abdemegeed M. M. A.; Lin, Ding-Bing
—This work is devoted to the development of a high gain Frequency Selective Surface (FSS) reflector backed monopole antenna using Machine Learning (ML) techniques for 5G applications. It analyzes and solves the complexity of the determination of the optimum position of the FSS reflector and the ground dimension of the monopole in this composite antenna structure since there are no solid and standard formulations for the computation of these two parameters. ML modelling is involved in the development process for the sake of gain enhancement. It is applied to get the optimum position of the FSS reflector layer and the ground dimension of the monopole antenna. The proposed antenna structure is 50 mm × 50 mm, implemented on a Rogers 5880 substrate (thickness = 1.6 mm). Two different patch antenna structures, with and without FSS, are developed and considered in the current work. The antenna performance in terms of operating frequency, return loss, and gain is analysed using the finite element methods. The design is optimized for a targeting frequency band operating at 6 GHz (5.53 GHz to 6.36 GHz), which is suitable for 5G Sub-6 GHz applications. The obtained results show that the integration of the FSS layer below the antenna structure provides a simple and efficient method to obtain a low-profile and high-gain antenna. Finally, the proposed design is fabricated and measured, and a good agreement between the simulated and measured results is obtained. A comparison with similar studies in the literature is presented and shows that the current design is more compact in size, and the obtained radiation efficiency and gain are higher than other designs. © 2021, Electromagnetics Academy. All rights reserved.
Citation - WoS: 1
Citation - Scopus: 4
Development of a Novel Ultra-Wideband Textile-Based Metamaterial Absorber for Mm-Wave Band Applications
(IEEE, 2022) Akarsu, Gokberk; Cengiz, Mehmet Faruk; Fawzy, Diaa E.; Zengin, E. Buse; Allam, A. M. M. A.; Taher, Hany; Cleary, Frances; Nakmouche, Mohammed Farouk
This work proposes an ultra-wideband Metamaterial (MM) absorber for smart electronic textile (etextile) applications. The design is based on a novel cell geometry composed of two combined letter patches (A&S) printed on a grounded textile substrate. This unit cell geometry is specifically developed and optimized for millimeter-wave (mm-wave) applications. In this study, different types of textiles are considered, namely, Felt, Denim, and Polyester, and the achieved -10 dB reflective fractional bandwidths are about 50.36%, 44.49% and 41.42%, respectively. A comparison between conventional counterparts PCB-based dielectrics (FR-4 and Rogers RT-5880) and textile-based fabrics (Felt, Denim, and Polyester) indicates that the bandwidths exhibited by textile fabrics are significantly wider. This study also demonstrates that the bending of textile-based materials has an inverse effect on the -10 dB bandwidth, as the material's surface curvature increases. The current design is more compact, thin, and more efficient in terms of absorptivity in comparison to other reported absorbers and structures in the literature. The obtained results can be considered promising for the development of ultra-wideband e-textile-based applications such as energy harvesting, health monitoring, and camouflage systems.
Citation - Scopus: 3
Development of a Symmetric Metamaterial Absorber With Bandwidth Improvements for 5g Millimeter-Wave Applications
(Institute of Electrical and Electronics Engineers Inc., 2022) Akarsu, Gokberk; Buse Zengin E.; Nakmouche M.F.; Cengiz, Mehmet Faruk; Fawzy, Diaa E.; Allam A.M.M.A.; Taher H.; Taher, Hany; Buse Zengin, E.; Nakmouche, Mohammed Farouk; Allam, A.M.M.A.
This study presents the development of a one-layer symmetrical Metamaterial Absorber (MMA) for millimeter-wave (mm-wave) applications. The target is to enhance the narrow band behavior and to achieve ultra-wideband with high absorptivity rates. The design is based on octagonal shaped cut rings and octagonal patches printed on grounded rigid substrate. A novel unit cell is developed and enhanced with the use of lumped elements technique to obtain ultra-wideband absorbers with high absorptivity rates. It is implemented on Rogers RT5880 with dielectric relative permittivity ? r=2.2, dielectric loss tangent of tan ?=0.0009, thermal conductivity of 0.2 W/m. K and with a 1.575 mm thickness. The characteristics of the MMA are examined in term of different resistive values, geometries, and angle of incidence. The obtained results show great enhancements in both the-10 dB bandwidth and in the absorptivity rates. The narrow bandwidth of the symmetrical design is enhanced by a factor of about 200 with average absorptivity of about 98% over the whole bandwidth. The current design is a very suitable for applications in the mm-wave. © 2022 IEEE.
Citation - WoS: 6
Citation - Scopus: 15
Development of a Wideband Substrate Integrated Waveguide Bandpass Filter Using H-Slotted Dgs
(Institute of Electrical and Electronics Engineers Inc., 2019) Nakmouche M.F.; Taher H.; Fawzy D.E.; Allam A.M.M.A.; Taher, Hany; Nakmouche, Mohammed Farouk; Fawzy, Diaa E.; Allam, A.M.M.A.
In the current work, a new Wideband Substrate Integrated Waveguide Bandpass Filter (SIW-BPF) is presented. The target is to allow vertical roaming between the X and Ku band applications. As a first step, we performed a parametric study of different etched slot geometries namely, H-Slotted, T-Slotted, and U-Slotted DGS in order to examine the effects of altering different geometrical parameters of the unit on its response. H-Slotted DGS shows the highest FBW with 82.89% on the average compared to other geometries. As a second step, the cell size and the numbers of the H-Slotted DGS were optimized with the use of finite element method with the following constraints taken into consideration: low cost fabrication, high Q-Factor, compact size and easy integration. One of the designs was chosen for fabrication to validate the designed circuit. The measured results show that our optimized filter achieves an insertion loss of 2.01 dB at 8.5 GHz, a return loss higher than 11 dB and fractional bandwidth of 90.87% for a single cell and a fractional bandwidth of 80.05% for multiple cells. The measured results are in good agreement with the simulated results. © 2019 IEEE.
Citation - WoS: 11
Citation - Scopus: 36
Development of H-Slotted Dgs Based Dual Band Antenna Using Ann for 5g Applications
(Institute of Electrical and Electronics Engineers Inc., 2021) Nakmouche M.F.; Allam A.M.M.A.; Fawzy D.E.; Bing Lin D.; Abo Sree M.F.; Bing Lin, Ding; Nakmouche, Mohammed Farouk; Fawzy, Diaa E.; Allam, A.M.M.A.; Abo Sree, Mohamed Fathy
The proposed work conducts a new approach for modeling a dual band monopole antenna design using DGS assisted by ANN. In the aim of efficient dual band antenna design with gain and optimal impedance matching, the Artificial Neural Networks technique (ANN) is used for the development process. This work presents a modeling for H-slotted Defected Ground Structure (DGS) based dual band antenna using ANN for 5G Sub-6 GHz applications. The designed antenna operates at 3.76 GHz and 6.1 GHz. The antenna gain is 2.18 dB and 2.75 dB at both frequencies, respectively. Firstly, a simulation is performed using CST EM simulator, then the predicted results in term of return losses and frequencies are fed into the ANN model. Secondly using a hybrid algorithm based on both feed-forward back-propagation and Levenberg-Marquart (LM) learning algorithm, the optimal position of the H-Slotted DGS in terms of 5G Sub-6 GHz band is extracted. Finally, the experimental validation is conducted and compared with the simulation results, a good agreement is obtained. © 2021 EurAAP.
Citation - Scopus: 2
Dual Band Antenna Design Using Pixeled Dgs for Energy Harvesting Applications
(IEEE, 2022) Derbal, Mohammed Cherif; Nakmouche, Mohammed Farouk; Nedil, Mourad; Allam, Amma; Fawzy, Diaa E.; Abo Sree, Mohamed Fathy; Amma, Allam
This letter describes a dual-band antenna for energy harvesting applications at 3.5 GHz and 5.8 GHz utilizing a multi-objective Genetic Algorithm (GA). An optimized Defected Ground Structure (DGS) has been etched in the patch antenna's ground to achieve a dual-band response. Moreover, the GA allows obtaining a maximum gain in both frequency bands. The proposed antenna has a good gain of 7.22 dBi and 6.18 dBi at 3.5 GHz and 5.8 GHz. An experimental validation is conducted using ROHDE & SCHWARZ ZVB20 network analyzer, and a good agreement with the simulation result is obtained. Therefore, this antenna is suitable for Wi-Fi energy harvesting applications.
Citation - WoS: 5
Citation - Scopus: 19
Dual Band Siw Patch Antenna Based on H-Slotted Dgs for Ku Band Application
(Institute of Electrical and Electronics Engineers Inc., 2020) Nakmouche M.F.; Fawzy D.E.; Allam A.M.M.A.; Taher H.; Sree M.F.A.; Taher, Hany; Sree, Mohamed Fathy Abo; Nakmouche, Mohammed Farouk; Fawzy, Diaa E.; Allam, A.M.M.A.
A dual band Substrate Integrated Waveguide; SIW microstrip patch antenna based on periodic H-Defected Ground Structure; H-DGS is designed for Ku band applications. SIW techniques provide low cost, small size and convenient integration with planer circuit. The proposed antenna structure is designed on a Roger 5058 substrate with a thickness of 1.6 mm, 2.2 of dielectric constant and tangent loss of 0.0009. The performance analysis of the proposed antennas is performed using finite element methods, and the simulation results show a gain and directivity of 7.03 dB and 7.38 dB respectively at 12.67 GHz center frequency and at 14.56 GHz a gain of 7.77 dB and directivity of 8.13 dB. The proposed antenna overall radiation efficiency is 95.25% and 95.60% at 12.67 GHz and 14.56 GHz, respectively. The obtained measurements show good agreement with the simulation results. The proposed antenna is compact, simple in structure, and can be used in a variety of applications in the Ku band. © 2020 IEEE.
Citation - WoS: 7
Citation - Scopus: 23
Low 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 Bing
In 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.
Citation - Scopus: 1
Low-Cost Aip Array Design Using Machine Learning for Mmwave Mobile Systems
(Institute of Electrical and Electronics Engineers Inc., 2021) Nakmouche M.F.; Idrees Magray M.; Allam A.M.M.A.; Fawzy D.E.; Lin D.B.; Tarng J.-H.; Fawzy, Diaa E.; Nakmouche, Mohammed Farouk; Allam, A.M.M.A.; Lin, Ding Bing; Idrees Magray, M.; Tarng, Jenn-Hwan
Based on low-cost PCB solution, an array antenna in packaging (AiP) dedicated for mmWave mobile systems is designed using machine learning. The proposed antenna operates at 28 GHz (26.5 - 29.5 GHz) with a gain ranging from 8 dB to 15 dB in the operating bandwidth. The development process of the proposed AiP is assisted by machine learning for prediction of the optimal radiating patch's length and width in terms of resonance frequency. © 2021 Taiwan Microwave Association.
Citation - Scopus: 6
Machine Learning Based Design of Ku Band Ridge Gap Waveguide Slot Antenna Loaded With Fss for Satellite Internet Applications
(Institute of Electrical and Electronics Engineers Inc., 2021) Nakmouche M.F.; Derbal M.C.; Allam A.M.M.A.; Fawzy D.E.; Shams S.I.; Nedil M.; Elsaadany M.; Fawzy, Diaa E.; Allam, A.M.M.A.; Gagnon, Ghyslain; Derbal, Mohammed Cherif; Nedil, Mourad; Nakmouche, Mohammed Farouk; Shams, Shoukry I.
Machine learning has been used in this work for the development of a Ku band Ridge Gap Waveguide (RGW) slot antenna loaded with an FSS superstrate for satellite internet applications. The structure operates from 13.25 to 14.75 GHz with a gain beyond 10 dB using FSS superstrate loading. The developed machine learning model aims to predict the optimal length and width of the radiated slot, where both the Fractional Bandwidth (FBW) and the resonance frequency are considered objective parameters. The simulated results and the anticipated results through the machine learning algorithm are in good agreement. © 2021 IEEE.
Citation - WoS: 8
Citation - Scopus: 12
A 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 Faruk
This 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.
Citation - Scopus: 4
A Novel Ultra-Wideband Metamaterial-Based Perfect Absorber for 5g Millimeter-Wave Applications
(Institute of Electrical and Electronics Engineers Inc., 2022) Akarsu G.; Nakmouche M.F.; Fawzy D.E.; Allam A.M.M.A.; Akarsu, Gokberk; Nakmouche, Mohammed Farouk; Fawzy, Diaa E.; Allam, A.M.M.A.
This paper proposes a novel design of an ultra-thin, miniature metamaterial (MM)-based ultra-wideband absorber. The unit cell is designed by combining two letters (H & S) and side patches for the generation of multi-resonance bands, and printed on a grounded dielectric of Rogers RT5880 material. Based on the numerical plane-wave simulations, the proposed absorber exhibits an ultra-wideband of about 16.2 GHz absorption bandwidth in the frequency range between 27.669 GHz and 43.871 GHz. The average absorptivity rates are close to 99% for incident angles between 0°-20°. The developed absorber preserves the ultra-wideband property of about 11.50 GHz for incident angles between 20° and 30° in the frequency range between 27.7 GHz and 39.2 GHz with average absorptivity rates close to 90%. This design is very suitable for 5G millimeter-waves and Ka-band applications. © 2022 IEEE.