Publications Scientifiques

Permanent URI for this communityhttps://dspace.univ-boumerdes.dz/handle/123456789/10

Browse

Author: search.filters.author.Khedrouche, DjamelHas files: No

Search Results

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Ultra wideband bandstop plasmonic filter in the NIR region based on stub resonators
    (IOP Publishing, 2023) Zegaar, Imane; Hocini, Abdesselam; Bensalah, Hocine; Harhouz, Ahlam; Khedrouche, Djamel; Lahoubi, Mahieddine
    In this study, we propose an ultra-wideband bandstop filter (UWB-BSF) using a plasmonic MIM waveguide coupled with a stub cavity that is investigated using finite-difference time-domain (FDTD). Air and silver are used as insulators and metals, respectively; silver is characterized by the Drude model. The structure can filter the optical telecommunication wavelengths of 1550 nm and 1310 nm. The transmission peak and the resonance wavelength of the basic structure can be tuned by varying the stub resonator's length and width. In order to improve the filtering function of the bandstop filter at broad bandwidth in the NIR region with maximum transmission peak, the number of stub resonators is increased to two, three, and four stubs with properly studied lengths and a proper horizontal distance between each two stubs. The bandwidth is enhanced from 350 nm, with two stubs, to 620 nm, with three stubs, and 770 nm, with four stubs, respectively. The corresponding filtered wavelength ranges are [1600 nm–1950 nm], [1330 nm–1950 nm] and [1180 nm–1950 nm] respectively. Moreover, with the increase in the number of stubs, the center wavelength achieves a blue shift to lower wavelengths. Further, the paper provides significant applications for plasmonic bandstop filters in highly integrated optical circuits
  • No Thumbnail Available
    Item
    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
  • No Thumbnail Available
    Item
    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