Publications Scientifiques

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Author: search.filters.author.Ayad, MouloudHas files: No

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    Compact UWB Patch Antenna with Open-Loop Resonator for Dual-Band Rejection
    (Horizon House, 2025) Fortas, Ibrahim; Ayad, Mouloud; Zoubiri, Bachir
    A novel approach to the design of a compact UWB patch antenna with improved rejection capabilities integrates a dual-ellipse structure in the patch geometry fed by CPW. It also employs four open-loop resonators to selectively target undesirable frequency bands, specifically WLAN (5.2 to 5.8 GHz) and the satellite downlink band (7 to 8 GHz). Experimental results closely align with the simulation, verifying the effectiveness of the open-loop resonators in enhancing rejection.
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    Wideband Eight-Element MIMO Antenna System for 5G FR1 Mobile Terminals
    (Institute of Electrical and Electronics Engineers Inc., 2024) Zidour, Ali; Alibakhshikenari, Mohammad; Ayad, Mouloud; Kouhalvandi, Lida
    In this paper, a broadband antenna system for multiple-input multiple-output (MIMO) applications in 5G FR1 mobile terminals. The MIMO design consists of eight L-shaped coupled slot antenna elements based on stepped impedance resonators (SIRs) that can generate resonances to achieve wide operating bandwidth. The simulated results of the MIMO system show a -6 dB wide impedance bandwidth of 47% ranging from 3.25 to 5.2 GHz and inter-element isolation level of greater than 12 dB have been obtained for each antenna element with an envelope correlation coefficient (ECC) below 0.05 providing a reliable anti-interference for the MIMO antenna system. In addition, the simulated total efficiencies are higher than 50% across the 5G NR bands; n77 (3.3-4.2 GHz), n78 (3.3-3.8 GHz), and n79 (4.4-5 GHz).
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    Dual-Band Vertically Polarized Endfire Antenna Array for 5G NR FR2 Bands Applications
    (Institute of Electrical and Electronics Engineers Inc., 2024) Zidour, Ali; Alibakhshikenari, Mohammad; Ayad, Mouloud; Kouhalvandi, Lida
    In this paper, a dual-band endfire antenna is proposed for promising 5G NR mmWave frequency (FR2) bands applications. The antenna design introduces a novel radiating aperture array analogy based on open-end substrate integrated waveguide (SIW) feeding technology to achieve vertically polarized dual-band operation. The simulated -10 dB impedance bandwidth achieves 11.5 % (26.3-29.5 GHz) lower band and 9.6 % (36.8-40.5 GHz) higher band. The peak realized gain is 8.78 dBi and 11.5 dBi in the lower and higher bands, respectively. The mmWave array delivers a scanning angle of ± 40° and ± 32° for a realized endfire gain higher than 5.5 dBi and 8.2 dBi at 28 GHz and 39 GHz, respectively.
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    Wideband Hybrid Dielectric Resonator Antenna Array for 5G mmWave Mobile Applications
    (Institute of Electrical and Electronics Engineers Inc., 2024) Zidour, Ali; Alibakhshikenari, Mohammad; Ayad, Mouloud; See, Chan Hwang; Limiti, Ernesto
    In this paper, a wideband hybrid dielectric resonator antenna (HDRA) array design is presented for fifth-generation (5G) millimeter wave (mmWave) applications. The hybrid antenna integrates three resonant radiators of feeding slot, ring patch, and DRA to generate four resonances around 28 and 38 GHz frequency bands. The antenna element within an overall size of 0.46λL × 0.46λL× 0.1λL(λLis the free-space wavelength at 28 GHz) can achieve wide impedance bandwidth, covering n257, n259, n260 and n261, simultaneously. The 1 × 4 HDRA array is designed and simulated based on the antenna element which can achieve high realized gain varies between 10.3 to 12.5 dBi and wide beam scanning angles of ±55° and ±40° at 28 and 38 GHz frequency bands, respectively.
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    Dual-band Endfire Phased Array Antenna for mmWave 5G NR Bands Applications
    (Institute of Electrical and Electronics Engineers, 2024) Zidour, Ali; Ayad, Mouloud; Alibakhshikenari, Mohammad; Guenad, Boumediene; Soruri, Mohamad; Kouhalvandi, Lida
    A dual-band endfire antenna phased array suitable for 5G NR mmWave bands applications is presented in this paper. The antenna introduces a novel radiating aperture array analogy based on open-end substrate integrated waveguide (SIW) technology to achieve wide dual-band operation and vertical polarization radiation. The simulated -10 dB impedance bandwidth achieves 17.4 % (25.2-30 GHz) lower band and 12.4 % (36.4-41.2 GHz) higher band covering mmWave 5G NR bands; n257, n260, and n261 with isolation levels higher than 15 dB over the operating bands. The peak realized gain is 8.8 dBi and 11.8 dBi in the lower and higher bands, respectively. The mmWave array delivers a scanning angle of ±50° and ±33° for a realized endfire gain higher than 6.5 dBi and 8.5 dBi at 28 GHz and 39 GHz, respectively.