Browsing by Author "Allam, A.M.M.A."

Now showing 1 - 20 of 22

Citation - Scopus: 1
Beamforming 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.; El-Din, M.S.H.Salah
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.
Design and Implementation of an Antenna for Automotive Applications at 76.5 Ghz
(Institute of Electrical and Electronics Engineers Inc., 2024) Mohamed, M.S.A.; Esam, G.; Allam, A.M.M.A.; Alexan, W.; Gadelmavla, Diaa; Şahin, Osman Nuri; Fawzy, Diaa E.
This paper presents an antenna candidate for automotive cars and MIMO radar applications. It is implemented on Rogers RO4003C with a relative dielectric constant of 3.55 and a thickness of 0.203 mm. Linearly and circularly polarized versions of printed antennas are presented and operate at 76.5 GHz, which meets the characteristics of the required application. One of the antennas is selected and fabricated for validation. The results of the reflection coefficient fo und good agreement between the simulated and measured ones. Further antenna parameters like 3D and 2D radiation patterns, realized gain and axial ratio are illustrated. © 2024 IEEE.
Citation - Scopus: 3
Design and Implementation of Smart Watch Textile Antenna for Wi-Fi Bio Medical Applications in Millimetric Wave Band
(Institute of Electrical and Electronics Engineers Inc., 2023) Allam, A.M.M.A.; Ghanem, M.G.; Fawzy, Diaa E.; Raafat, M.A.; Abbas, M.A.; Abo, Sree, M.F.; El-Din, M.S.H.S.; Abo Sree, Mohamed Fathy
This paper is devoted to the design and implementation of smart watch textile antenna for Wi-Fi bio-medical applications in millimetric wave bands. The antenna is implemented on the leather textile-based substrate to be embedded in a smart watch. It enables the watch to pick up Wi-Fi signals without the need to be connected to a mobile through Bluetooth. It operates at 60 GHz or WiGig (Wireless Gigabit Alliance) band with a wide band for higher-rate applications. It also could be implemented over many stratified layers of the body organisms to be used in the diagnosis of many diseases like diabetes and cancer. The structure is designed and simulated using CST (Studio Suite) program. The wearable patch antenna has an octagon shape and it is implemented on leather material that acted as a flexible substrate with a size of 5.632 x 6.4 x 2 mm 3, relative permittivity of 2.95, and loss tangent of 0.006. The feeding is carried out using differential feed (discrete port in CST). This work provides five antenna implementations; antenna without ground, a ground is added at the back of the antenna in order to increase the antenna gain, the substrate dimensions are increased to 15 x 30 mm2 to resemble the real hand watch size, layers of skin and fat are added under the ground of the antenna to study the effect of human body tissues human on the antenna performance. Finally, the whole structure is bent. It is found that the antenna can achieve a simulated peak realized gain in dB of 5.68, 7.28, 6.15, 3.03, and 4.37 for antenna without ground, antenna with the ground, antenna with larger substrate dimensions, antenna with skin and fat, and bent structure, respectively. The antenna with ground exhibits high gain, while adding the human organisms absorption, the gain is degraded because of human absorption. The bent structure contributes to higher gain. © 2023 IEEE.
Citation - Scopus: 1
Design and Implementation Rgw Based Uwb Antenna Array for D-Band Applications
(IEEE Computer Society, 2022) Cengiz M.F.; Allam A.M.M.A.; Fawzy D.E.; Ghanem M.G.; Helala M.A.; Fawzy, Diaa E.; Ghanem, M.G.; Allam, A.M.M.A.; Cengiz, Mehmet Faruk; Helala, Mahmoud.A.
This study presents a new 4×1 rectangular slot antenna array based on ridge gap waveguide (RGW) technology for the use of D-band applications. The operating frequency of the proposed array antenna is 140.9-157.7 GHz. The Finite Integration Time-Domain (FITD) method is used to optimize the design parameters. Four rectangular slots are placed side by side and the RGW feeding network is used to feed them with minimal dispersion. Quarter-wavelength transformers are used to match the source to the load composed of the antenna array and feeding network. The antenna overall efficiency is around 95%. The antenna array's maximum gain is about 10 dBi, compared to the single antenna's gain of roughly 7 dBi. © 2022 IEEE.
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.
Development of a Split Ring Resonator Sensor for Vibration Detection
(Institute of Electrical and Electronics Engineers Inc., 2024) Zengin, E.B.; Fawzy, D.E.; Allam, A.M.M.A.; Şahin, O.N.
The main focus of this work is the development of a metamaterial-based vibration sensor for the detection of earthquake amplitudes. The sensor is composed of two metamaterial layers made of FR-4 substrates with Circular Split Ring Resonators (CSRR) arranged in a back-to-back configuration on each substrate. The variation of the spacing between the plates results in an alteration of the electric field and thus changes in the resonance frequencies of the whole system. The system is designed and optimized to resonate in the GSM 1.8 GHz band, which ultimately results in a self-sustaining sensor. A clear relationship between the spacing of the two layers and the shift in the resonance frequency has been obtained. It also changes the magnitude of the reflected and absorbed energy from the sensor. This spacing in turn can be directly correlated with the vibration amplitudes. The system can be integrated into a warning system with the ability to quantify the structural resilience of buildings against potentially damaging vibrations. Different unit cell geometries of metamaterial surface are tested before selecting the CSRR geometry to develop highly sensitive sensors operating in the GSM frequency band at 1.8 GHz. © 2024 IEEE.
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 - 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: 3
Citation - Scopus: 5
Interfacing 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.; Fawzy, Diaa E.; Gagnon, Ghyslain; Allam, A.M.M.A.; Sebak, Abdelrazik; Elsaadany, Mahmoud; Shams, Shoukry I.; Ali, Mohamed Mamdouh M.
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.
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 - Scopus: 15
Metamaterial-Based Mm-Wave Phased Array for Broadband Cellular Networks
(Institute of Electrical and Electronics Engineers Inc., 2023) Amar, A.S.I.; Parchin, N.O.; Fawzy, Diaa E.; Allam, A.M.M.A.; Eid, A.M.; Soliman, M.A.
A new broadband phased array antenna with wide-scan and high-gain beam-scanning are desirable to meet the requirements of future cellular networks. This paper discusses the characteristics of a new beam-steerable array design having broad bandwidth for 5G communications. The discussion is focused on smartphones, due to their small size and complexity. The design procedure is straightforward and accomplished on a mainboard of future smart handheld devices. The introduced phased array design involves eight metamaterial-based dipole resonators with a 1×8 linear form. The resonators have small sizes with microstripline feedings. For -10 dB, the design represents 28-38 GHz covering several bands in the 5G spectra. © 2023 IEEE.
Citation - Scopus: 1
Mimo Slot Antenna With Polarization Diversity and Dual Notched Bands for Uwb Applications
(Institute of Electrical and Electronics Engineers Inc., 2023) Parchin, N.O.; Amar, A.S.I.; Fawzy, D.E.; Allam, A.M.M.A.; Eid, A.M.; Ibrahim, A.G.A.
This paper introduces a 4-port MIMO slot antenna system with dual notched bands, which is designed for future wireless communications. The antenna structure consists of four modified U-shaped radiation stubs with a shared ground plane, arranged in a planar form. The results demonstrate that the antenna operates effectively across frequencies ranging from 2.1 to 10.7 GHz, covering the entire ultra-wideband (UWB) spectrum. Moreover, two notched filtering characteristics have been incorporated at 3.3 to 4.2 GHz and 5 to 6 GHz, utilizing modified radiation stub resonators. These notches effectively suppress interference from C-band, WLAN, and WiMAX interfaces. The performance of the proposed antenna design has been thoroughly evaluated in terms of its fundamental characteristics. The results show that the antenna achieves satisfactory scattering parameters, 3D radiation patterns, efficiency, and gain levels. The designed UWB antenna system fulfills the requirements for MIMO and diversity applications. © 2023 IEEE.
Citation - Scopus: 2
A Multi-Band Textile-Based Mtm Absorber for Energy Harvesting Applications
(Institute of Electrical and Electronics Engineers Inc., 2023) Allam, A.M.M.A.; Helala, M.A.; Fawzy, Diaa E.; Abbas, M.A.; Sree, M.F.A.; Parchin, N.O.; Amar, A.S.I.
This paper is devoted to design and implementation of multi-band textile based Metamaterial absorber operating at K and Ku bands to be deployed in energy harvesting system. The unit cell of the absorber comprises a ground plane of copper annealed, Felt textile and top ground layer with etched Jerusalem cross surrounded with etched square ring. It provides three highly resonant peaks at 16.7 GHz, 18.6GHz, and 22.45 GHz, with absorption percentages of 99.8%, 96.5%, and 99.7%, respectively. The full width at half maximum (FWHM) is 3.35 GHz (19%) at 17.6 GHz. In addition, the absorber provides a wideband of absorption for oblique incidence up to 20 degrees and also at different bending radii. The relative permittivity and permeability are studied to demonstrate it effect on the absorption mechanism. A negative index of refraction is achieved over a band of 6.5 GHz from 16 GHz to 22.5 GHz, which leads to perfect absorptivity. © 2023 IEEE.
Citation - Scopus: 3
A Novel Substrate Integrated Gap Waveguide Ultra Wide-Band Circular Directional Coupler for Ku Band Applications
(Institute of Electrical and Electronics Engineers Inc., 2023) Cengiz, Mehmet Faruk; Allam, A.M.M.A.; Fawzy, Diaa E.
This study presents a new circular compact Ultra Wide-Band (UWB) substrate integrated gap waveguide (SIGW) based 3 dB hybrid coupler for Ku band applications. The coupling section is a circular structure with an elliptic slot and additional via to achieve equal-power division in two ports and isolation in the 4th port. To optimize the design parameters of the hybrid coupler, the Finite Integration Time-Domain (FITD) approach is employed. The operating frequency of the coupler is between 12.14 to 15.4 GHz with a central frequency of 13.5 GHz, a bandwidth of 3.26 GHz, and a Fractional Band Width (FBW) being 23.67%. A phase difference throughout the operational spectrum around 90° has been attained. The coupler is fabricated with an overall dimension of 33.8 x 33.8 mm2. The measured and simulated scattering parameters demonstrate satisfactory agreement. © 2023 European Association for Antennas and Propagation.
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.
On the Design of Reconfigurable Wideband Ridge Gap Waveguide Amplifier Modules
(Institute of Electrical and Electronics Engineers Inc., 2020) Fawzy, Diaa E.; Gagnon, Ghyslain; Allam, A.M.M.A.; Elsaadany, Mahmoud; Sebak, Abdelrazik; Shams, Shoukry I.; Ali, Mohamed Mamdouh M.
Optimizing Ridge Gap Waveguide Based Slot Antenna Shape for Maximum Gain and Bandwidth for Satellite Applications
(Institute of Electrical and Electronics Engineers Inc., 2022) Akarsu, Gokberk; Fawzy, Diaa E.; Allam, A.M.M.A.; Cengiz, Mehmet Faruk