Abdelhamid Shaalan

Abdelhamid Shaalan

Zagazig University

H-index: 15

Africa-Egypt

Professor Information

University

Zagazig University

Position

- faculty of Engineering

Citations(all)

876

Citations(since 2020)

608

Cited By

439

hIndex(all)

15

hIndex(since 2020)

11

i10Index(all)

18

i10Index(since 2020)

14

Email

University Profile Page

Zagazig University

Top articles of Abdelhamid Shaalan

Integrated rules classifier for predicting pathogenic non-synonymous single nucleotide variants in human

The most prevalent kind of genetic variants in humans are non-synonymous single nucleotide variants (nsSNVs). Several prediction tools have been launched to forecast the effect of amino acid substitutes on human protein function. These tools sort variants as pathogenic or neutral. We developed an Integrated Rules Classifier (Integration Score through JRip “ISTJRip”), which integrates the four individual tools that are publicly available; iFish, Mutation Assessor, FATHMM, and SIFT-based on the JRip machine learning technique. Additionally, we compared the ISTJRip approach with the other three created integration classifiers; Integration Score through J48 “ISTJ48”, Integration Score through RF “ISTRF”, and Integration Score through SVM “ISTSVM” using a VaribenchSelectedPure dataset character from the standard dataset “Varibench”. The proposed integrated rules classifier “ISTJRip” and the other three …

Authors

Marwa S Hassan,AA Shaalan,Shymaa Khamis,Ahmed Barakat,MI Dessouky

Journal

Gene Reports

Published Date

2024/3/1

Effect of Via-Array Side Walls on the Characteristics of SIW Resonator with Novel Design Equations.

The present work proves by both simulation and experimental work that the most common empirical formulas available in the previous publications for the design of substrate-integrated waveguide (SIW) cavities are incorrect in most cases. Moreover, the present work provides correct and exact design equations that are examined by both simulation and experimental work. In planar circuit structures, rectangular waveguide and resonators are commonly integrated within a dielectric substrate to produce what is known as SIW structures. For ease of fabrication and embedding into the dielectric substrate, the closed (solid) side walls of the rectangular waveguides and resonators are replaced by metallic via arrays. The main concern of the present paper is to investigate the effects of such replacement on the performance of a SIW resonator through simulation as well as experimental work. The limiting constraints on the relative dimensions of such via arrays including the diameter of the vias and the spacing between them are numerically and experimentally investigated to ensure proper operation of the SIW resonator regarding the radiation loss due to leakage from the openings of the resonator side walls. The effects of the via array dimensions on the resonant frequency, radiation loss, and quality factor (Q-factor) of the resonator are evaluated. For this purpose, two models of the rectangular resonator embedded in the dielectric substrate are designed to operate at 10 GHz. The first model is an ideal box-shaped resonator of solid sidewalls whereas the other model is a conventional SIW resonator with via-array side walls. The two types of the substrate …

Authors

Samar M Azab,Abdelhamid A Shaalan,Khalid FA Hussein,Asmaa E Farahat

Journal

Progress in Electromagnetics Research B

Published Date

2024/1/1

Super-Wideband Fractal Antenna for Future Generations of Wireless Communication.

A super-wideband (SWB) antenna of enhanced performance is proposed to cover the frequency band from 3 to 30GHz. The proposed antenna can be regarded as a two-arm antenna of fractal structure. Each of the antenna arms can be viewed as composed of multiple merged wideband fractal elements. Each fractal element is a wide-flare metallic sector-shaped radiator with circular (arc-shaped) edges to enhance the bandwidth over which the antenna impedance is matched to 50Ω-feeder. A novel SWB balun is proposed for feeding the two-arm antenna of its balanced structure through the conventional coaxial feeder of its unbalanced structure. For experimental assessment of its performance, the proposed antenna is fabricated and measured by a vector network analyzer (VNA). The experimental results come in agreement with the results obtained by the CST R ⃝ simulator. It is shown that the proposed antenna has a ratio bandwidth (RBW) of 10: 1, percentage bandwidth (% BW) of 164%, and bandwidth-dimension ratio (BDR) of 1952. The efficiency of radiation of the proposed antenna is shown to be greater than 98% over most of the operational frequency band.

Authors

Mohamed S Fouad,Asmaa E Farahat,Khalid FA Hussein,Abdelhamid A Shaalan,Mai F Ahmed

Journal

Progress In Electromagnetics Research C

Published Date

2023/10/1

Analysis and design of sub-6 beam steerable antenna array using meta-material loaded vivaldi elements

In this paper, a sub-6 beam-steerable antenna array system is introduced. The main radiating element in the proposed array is a gain-enhanced Vivaldi antenna, whose overall realized gain is improved by introducing near-zero-index metamaterial (NZIM) with broadband characteristics at 3.6 GHz. The proposed system is intended to be integrated with fifth-generation automotive applications. The 4 × 4 butler matrix is resonating at 3.6 GHz to feed the designed antenna array elements and steer the radiating beam. When altering the phase of the input signal, the primary beam direction is steered at an angle from 45° to 135°. So, by choosing the butler matrix input port, the phase of each radiating element is changed, which leads to precise beam direction control. All the system components, including antenna elements and the [4 × 4] butler matrix, are designed, simulated, and optimized. In order to verify the …

Authors

A Khairy,A Elboushi,AA Shaalan,MF Ahmed

Journal

Analog Integrated Circuits and Signal Processing

Published Date

2023/4

A novel compact dual notch with high-gain multi-layer dielectric resonator antenna for ultrawide-band applications

In this paper, a novel compact high-gain multi-layer dielectric resonator antenna for ultrawideband applications is designed and fabricated. The proposed antenna employs a new technique to make a notch-band for the frequencies within UWB. This technique helps avoid any interference for bands like WLAN and X-band for satellite applications. In this design, several notch bands can get at different frequencies by changing the length of slots. The operating bandwidth of this antenna is between 4.8 GHz and 11.31 GHz with− 10dB return loss and maximum gain of 6dBi. Finally, the proposed antenna is fabricated and measured to validate the simulation results. The simulation results are obtained by two different simulators; CST Studio suiteTM 2020 and HFSS 15 to ensure the validity of the design results before fabrication. The fabricated antenna is measured using Agilent R&S Z67 VNA. There is a good agreement between the simulation and experimental results.

Authors

Mai F Ahmed,Mona A Mohamed,Abdel A Meneam Shaalan,Walid S El-Deeb

Journal

Progress In Electromagnetics Research M

Published Date

2022/6/1

Analysis and Design of Wide Band 28/38 GHz Antenna Array Integrated with 3D printed Dielectric Lens For 5G Automotive Applications

This paper presents the design of a Chebyshev linear antenna array (CLA) integrated with the dielectric lens. In comparison to a uniform amplitude distribution (UAD), a Chebyshev amplitude distribution (CAD) is used to achieve a low side lobe level (SLL) characteristic and increase the directivity of the antenna array. The proposed CLA is optimized to operate at a high fifth generation (5G) frequency. The proposed CLA achieves a-10 dB broadband width from 25.8 GHz to 42.4 GHz. The dielectric lenses can be employed to modify the phase and amplitude of the antenna array, which increases the realized gain and leads to stable radiation over the operational bandwidth. The main purposes of the dielectric lens are to improve the realized gain, enhance efficiency, and result in stable radiation pattern properties. The CLA is integrated with an epoxy resin dielectric lens, which has a relative permittivity (ε r) of 2.716. The proposed CLA integrated with a dielectric lens has a realized gain of 15.2 dB at 28 GHz and 11.94 dB at 38 GHz, respectively. The proposed design is simulated using CSTMWS2020 and HFSS. However, to verify the obtained results, the proposed design is fabricated using a photolithography process technique, and the dielectric lens is fabricated using a 3D printing technique.

Authors

A Elboushi,AA Shaalan,MF Ahmed

Published Date

2022/6/29

Evaluation of Free Space Optics Uplink Availability to LEO Satellite Using Climatic Data in Cairo.

Free space optics uplink to Low Earth Orbit (LEO) satellite with 500Km distance and 1.55 μm wavelength is evaluated with 10Gbps data rate and 70W transmitted power. The equivalent effects for all weather parameters are given by the measured visibility used to determine the weather attenuations by using Mie-Scattering, in this proposed. These high attenuations reduce the availability performance of the FSO uplink. The scintillation (Cn 2) had estimated using a compatible model of Cairo weather, and the turbulence effect (beam divergence) becomes very weak by using the aperture diameter of the receiver higher than the maximum optical spot size due to turbulence and divergence. During the year 2019, the visibility must be greater than 5Km, and weak scintillation turbulence is Cn 2< 0.00566∗ 10− 16 m− 2 3⁄ at distance 500Km. The availability evaluations based on predicted attenuation due to weather and turbulence using data measured in Cairo and the effects of all parameters on the performance of FSO are discussed. The required transmitted power must be related to the expected visibility. In year 2019, the availability of link becomes 99.9945%.

Authors

Adel Zaghloul,Abdalhameed A Shaalan,Hany Kasban,Amal Ashraf

Journal

J. Commun.

Published Date

2021/8

Effect of fog and scintillation on performance of vertical free‐space optical link from Earth to low Earth orbit satellite

This paper studies the effects of fog and scintillation attenuations on the performance of the vertical free‐space optical (FSO) link from the Earth to low Earth orbit (LEO) satellite. FSO link performance was investigated under different foggy conditions and turbulence by calculating the power received, achieved data rate, and link margin. Different parameters were studied such as the wavelength, the transmitted power, the divergence angle, and the diameter of receiving optical antenna. The results show that the FSO performance can be improved using 1,550‐nm wavelength, increasing the transmitted power to a range of 5 mW and reducing the divergence angle to a range of 1 μrad.

Authors

Amal Ashraf,Adel Zaghloul,Abdalhameed A Shaalan,Hany Kasban

Journal

International Journal of Satellite Communications and Networking

Published Date

2021/5

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