Publications Scientifiques

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Author: search.filters.author.Benlakehal, Mohamed ElamineHas files: No

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    Design and simulation of high gain 2-element, 4-element and 16-element arrays of microstrip patch antenna for terahertz applications based on photonic crystals
    (AIP Publishing, 2024) Benlakehal, Mohamed Elamine; Shayea, Ibraheem; El-Saleh, Ayman A.; Alhammadi, Abdulraqeb
    In the past years, the study of microstrip patch antennas has made significant progress because of their miniature size, low cost, compatibility, and ease of manufacture compared to traditional antennas. In this study, different microstrip patch antenna array configurations including 2-element, 4-element and 16-element were studied and designed in the range of frequencies of 0.25- 0.55 THz. This study aims to enhance the gain and the radiation properties of these proposed antenna array configurations using air cylinder holes photonic band gap (PBG) substrate instead of the homogeneous substrate. Simulation was conducted with the help of CST Microwave Studio software for the different substrates. To obtain better radiation properties, the proposed antenna arrays have around 0.35 THz resonant frequencies where there exists a low atmospheric attenuation window in the terahertz band. The outcomes demonstrated that the studied antenna arrays based on the photonic band gap substrate provided additional performance in terms of the return loss, bandwidth, gain, directivity and beamwidth compared to their corresponding conventional antenna arrays counterparts based on the homogeneous substrate. Among all designed antenna array configurations, the 16-element antenna array based on the photonic band gap has successfully achieved impressive gain and directivity performance of 16.75 dB and 17.40 dBi, respectively. Finally, the proposed antenna arrays are highly promising candidates for wireless communications, imaging, sensing, medical diagnosis and threat detection.
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    Data Caching in Edge Computing: A Survey
    (Institute of Electrical and Electronics Engineers Inc., 2024) Kara, Meliha Çağla; Benlakehal, Mohamed Elamine; Shayea, Ibraheem; Tussupov, Akhmet; Rzayeva, Leila
    As the Internet of Things (IoT) generates ever-increasing data streams, traditional cloud-centric architectures face crippling challenges in network latency, bandwidth consumption, and resource constraints. This paper explores how data caching in edge computing environments emerges as a potent solution, significantly impacting latency reduction, network efficiency, and overall system performance. We comprehensively review the landscape of edge IoT and data caching, analyze caching benefits and complexities, and delve into architectural integration, caching strategies, and algorithms tailored to address specific IoT challenges. Through case studies in chosen application domains, we quantify the performance improvements enabled by effective caching and pave the way for future research exploring novel caching methodologies and optimization techniques in the dynamic world of edge IoT.
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    Gain enhancement of a novel 1 × 2 microstrip patch antenna array based on cylindrical and cuboid photonic crystal substrate in THz
    (Springer, 2023) Benlakehal, Mohamed Elamine; Hocini, Abdesselam; Khedrouche, Djamel; Temmar, Mohamed Nasr eddine; Denidni, Tayeb Ahmed
    Recent advancements in the next-generation wireless communication technologies require high gain and larger bandwidth. In this paper, a high gain novel 1 × 2 circular microstrip patch antenna array is proposed to operate around 0.65 THz based on different substrates. First, the proposed antenna array is designed based on air cylinders holes embedded in a thick polyimide substrate, and then by using air cuboids holes. The proposed antenna array model is compared with a homogeneous polyimide substrate. The simulation results showed that the performance of the proposed antenna array was enhanced especially by using air cuboids holes and achieved a minimal return loss of − 74.10 dB, a wide bandwidth greater than 290 GHz, a gain of 10.57 dB, and radiation efficiency of 82.96% at a resonance frequency of 0.65 THz. Next, the gain of the proposed antenna array is investigated further by using two different substrates with a modified non-periodic photonic crystal where the air cylinders holes and air cuboids holes are mixed at the same time and embedded in the substrate with different diameter values. The simulation showed an enhancement in the gain where the highest gain was achieved by antenna array 4 of 12.03 dB. The proposed antenna array can be useful in imaging, sensing, and next-generation wireless communication technologies. The simulation is carried out by using the CST Microwave Studio simulator
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    Design and analysis of a 1 × 2 microstrip patch antenna array based on periodic and aperiodic photonic crystals in terahertz
    (Springer, 2022) Benlakehal, Mohamed Elamine; Hocini, Abdesselam; Khedrouche, Djamel; Temmar, Mohamed Nasr eddine; Denidni, Tayeb Ahmed
    In terahertz (THz), high gain antennas are required to overcome the atmospheric attenuation and path losses, for this aim the antenna arrays are helpful. In this paper, we designed and analyzed six terahertz microstrip patch antenna arrays based on diferent substrates, including homogeneous, periodic photonic crystals and fve new aperiodic photonic crystals substrates in the frequency range of 0.5–0.8 THz, which have applications in the next generation wireless communication technologies such as imaging, sensing and detection. The proposed antenna arrays are mounted on a thick polyimide substrate where each of the modifed photonic crystal substrates is divided into several sets of perforated air cylinder holes where each set had its particular radius. The simulation has been performed using CST microwave studio for the proposed antenna arrays which resonated around 0.65 THz and showed high radiation characteristics compared to the conventional antenna array. The highest radiation characteristics were achieved by antenna array 6 which is designed based on aperiodic photonic crystals, which obtained at the resonance frequency of 0.66 THz a very low return loss of −92.89 dB, larger bandwidth greater than 282 GHz, high gain of 11.77 dBi and radiation efciency of 87.63 %. Whereas, the conventional antenna array ofered at the resonance frequency of 0.635 THz −29.73 dB, 62.81 GHz, 8.47 dBi and 84.21 %, respectively. Finally, the link budget analysis was discussed by estimating the total signal loss