Publications Scientifiques

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Author: search.filters.author.Azrar, Arab

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    High Gain and Wide Beam Printed LPDA with Improved Bandwidth Based on Multiple Scaling Factors
    (Institute of Electrical and Electronics Engineers Inc., 2024) Benamraoui, Abdelhak; Ghozlane, Mohamed Anouar; Azrar, Arab; Bencheikh, Mohammed Laid
    In this paper, a modified printed log periodic dipole array (MPLPDA) antenna based on multiple scaling factors for high gain and wide beam-width is presented. To improve the gain and broaden the beam while enhancing the impedance bandwidth, a design based on dividing the LPDA dipole elements into three groups with three scaling factors for each group is proposed. The -10 dB bandwidth of 1.36 GHz to 12.8 GHz is realized in addition to some high frequency sub bands. Furthermore a -7.3 dB bandwidth of 1.29 GHz to 18 GHz is achieved. The designed antenna is realized on F4B substrate with thickness of 1mm and a good agreement is noticed in the measurement of the input reflection coefficient and radiation patterns. The measurements show the UWB end-fire operation of the proposed LPDA with a maximum realized peak gain of 10.59 dBi. Moreover, the fabricated antenna maintains a realized gain values greater than 5 dBi and -3 dB beam-widths at both E and H plane wider than 58°in almost all L, S and C band frequencies. The proposed antenna can be used for ESM / ELINT systems by tilting it at an angle of 45°for high polarization receiving capability.
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    Gain Enhancement of Monopole Antenna using AMC Surface
    (Advanced Electromagnetics, 2018) Mouhouche, Faiza; Azrar, Arab; Dehmas, Mokrane; Djafer, Kahina
    A CPW rectangular-ring antenna over an Artificial Magnetic Conductor (AMC) is presented in this work. The AMC is a designed as a dual-band structure having an array of unit cells and operates at 2.45GHz and 5.20 GHz. A CPW antenna uses this dual-band AMC structures as a back-plane. Performance comparison is carried out with and without incorporation of AMC. The simulated and measured results show that the combination of the AMC reflector and the antenna provide directional properties at both frequency bands. It has been found that the antenna gain increases by about 5 dB
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    Design and analysis of a microstrip patch antenna for medical applications
    (IEEE, 2017) Grabssi, Wahiba; Izza, Sarah; Azrar, Arab
    In this work, a dual band Microstrip patch implantable antenna for biomedical applications has been presented to operate in both Medical Implant Communications Service (MICS) with a range of 402-405 MHz and 2.4-2.5 GHz band chosen among the Industrial Scientific and Medical (ISM). A rectangular antenna has been first simulated to operate in MICS band with dimensions of 179.7 × 228.3 × 1.63 mm, then, a new meandered serpentine shape, with single feed point, has been used in order to lengthen the current path and covers both MICS and ISM bands with new dimensions of 31 × 25 × 1.63 mm printed on dielectric material of 4.3 constant
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    Beamspace Unitary ESPRIT Parameter Channel Estimation for Pilot Contamination Mitigation
    (Institute of Electrical and Electronics Engineers Inc., 2018) Smaili, N.; Djeddou, Mustapha; Chafaa, Irched; Azrar, Arab
    The main aim of this paper is to resolve a pilot contamination (PC) problem in multicell Massive MIMO system, where the PC is considered as a bottleneck in such systems caused by lack of orthogonality. To address this constrained problem, we propose a new approach based on beamspace unitary (BU) estimation of signal parameters via rotational invariance technique (ESPRIT) for parameter channel estimation. Indeed, the PC mitigation is based on two steps, channels parameter estimation and then reconstruction of desired channel by exploiting the path gains magnitude. The simulation results demonstrate the effectiveness of the proposed approach.
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    Pilot contamination mitigation based on antenna subset transmission for mmWave massive MIMO
    (wiley, 2018) Smaili, Nessrine; Djeddou, Mustapha; Azrar, Arab
    This paper tackles the problem of pilot contamination (PC) in mmWave Mas- sive MIMO cellular systems. We propose an analog precoder based on antenna subset transmission technique to mitigate the PC. This technique ensures the interfering signal to become noise-like signal thus helping a more efficient estimation of channel coefficients. Also, this strategy is low cost and introduces no complexity load. The result shows the effectiveness of the proposed precoder to mitigate PC issue
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    Effect of oblique projection beamforming on the achievable rate in massive MIMO system
    (Springer, 2018) Smaili, Nessrine; Djeddou, Mustapha; Ghanem, K.; Azrar, Arab
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    Spectral-domain integral-equation analysis of microstrip antenna working around 24 GHz
    (Wiley, 2000) Azrar, Arab; Aksas, Rabia; Vander Vorst, André
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    Full-wave analysis of the broadband circular polarization microstrip patch antenna
    (Wiley, 2000) Azrar, Arab; Aksas, Rabia; Vander Vorst, Andre
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    Full‐wave analysis of the broadband circular polarization microstrip patch antenna
    (Wiley, 2000) Azrar, Arab; Aksas, Rabia; Vander Vorst, Andre
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    Novel analysis and design approaches of the planar antenna arrays
    (Springer, 2007) Azrar, Arab; Chemsa, Ali; Aksas, Rabia