Browsing by Author "Ayad, Mouloud"

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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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    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.
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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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    Tri-Band endfire antenna array with wide Angles of Beam-Scanning capability for 5G mmWave mobile communication
    (Institute of Electrical and Electronics Engineers Inc, 2023) Zidour, Ali; Ayad, Mouloud; Alibakhshikenari, Mohammad; Basherlou, Haleh Jahanbakhsh; Parchin, Naser Ojaroudi; See, Chan Hwang
    In this paper, a novel multiband phased array antenna with endfire radiation pattern is designed at millimeter-wave (mmWave) frequency bands for 5G mobile applications. The proposed antenna element is a compact quasi-Yagi with a modified dipole driver to generate multiband operation, arranged on low-loss RO4003C materiel. The antenna array achieves excellent performance and covers wide frequency ranges of (24.15-29.8 GHz), (36.2-50 GHz) to support 5G NR bands; 26, 28, 39 and the new allocated 48 GHz. The array can exhibit a maximum realized gain from 8.4 dBi to 11.8 dBi. Meanwhile, wide beam-scanning angles from - 68° to 65° at 28 GHz, from 40° to 41° at 39 GHz, and from - 33° to 35° at 48 GHz are realized.
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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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    Wideband Endfire Antenna Array for 5G mmWave Mobile Terminals
    (Institute of Electrical and Electronics Engineers Inc., 2024) Zidour, Ali; Ayad, Mouloud; Alibakhshikenari, Mohammad; See, Chan Hwang; Lai, Ying-Xin; Ma, Yue.; Guenad, Boumediene; Livreri, Patrizia; Khan, Salahuddin; Pau, Giovanni; Denidni, Tayeb A.
    In this paper, a compact endfire antenna array with low-profile, small clearance, and wideband operation is proposed for millimeter-wave (mmWave) fifth-generation (5G) mobile terminals. The wideband operation is achieved by exciting two identical bow-tie dipoles inserted on both sides of a multilayer substrate fed by an asymmetric open-end stripline to slotline transition. The antenna performance is significantly improved by introducing a set of vertical metallic vias. The proposed antenna element can achieve 29 % from 24.2 GHz to 32.4 GHz with a peak realized gain that varies from 3.5 dBi to 4.5 dBi. A linear 4-element antenna array is arranged and fabricated to verify the proposed antenna beamforming capabilities. The simulated and measured bandwidth achieves a wide range of 34.4 % (24-34 GHz) to support 26, 28, and 30 GHz 5G mmWave bands with an isolation level better than 20 dB and a peak realized gain over the interested bands ranging from 7.56 to 8.14 dBi. The simulated array scanning angle is ± 68° at 28 GHz within 3-dB gain deterioration. Furthermore, the simulated spherical coverage has met the requirements of 3GPP standards which make the proposed antenna array a promising candidate to be integrated within mmWave 5G mobile devices
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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.