Publications Scientifiques

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Author: search.filters.author.Boutejdar, Ahmed

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    Quad-band microstrip patch antenna for WLAN/WIMAX/C/X applications
    (IEEE, 2017) Challal, Mouloud; Mouhouche, Faiza; Djafri, Kahina; Boutejdar, Ahmed
    This work proposes a novel quad-band microstrip patch antenna for wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX), C and X applications. It is composed of a modified rectangular patch antenna and two parasitic elements which are both printed on one side of a FR4 substrate, a ground plane on other side on which a U-shaped slot is etched. The proposed antenna, with a total size of 31×33 mm 2 , is fabricated and experimental results illustrate that the -10 dB impedance bandwidth can completely cover the 4.4-4.58 GHz, 5.4-5.6 GHz, 7.2-8.3 GHz and 9.6-10.3 GHz, applications. The simulation results are in good agreement with the measurement ones
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    Design and manufacturing of a novel compact 2.4 GHz LPF using a DGS-DMS combination and quasi octagonal resonators for radar and GPS applications
    (2019) Boutejdar, Ahmed; Challal, Mouloud; Das, Sudipta; El Hani, Soumia
    In this paper, a new compact microstrip low-pass filter (LPF) with ultra-wide stopband characteristics is presented. The combinations of DGS-DMS along with quasi octagonal resonators are employed in the design of the proposed filter to achieve compact size and ultra-wide stopband suppression level. The proposed filter has been designed, simulated, optimized and tested. The design procedure is validated using the commercial full-wave EM MoM simulator Microwave Office. Simulated as well as measured results of low-pass filter exhibit sharp roll-off (ξ) of 19 dB/GHz and creating transmission zero at around 7.8 GHz with attenuation level -54 dB. The measurement results show good agreement with the simulations. The cutoff frequency of the proposed low-pass filter is 2.4 GHz with the insertion loss less than 0.3 dB. The ultra wide stop band with over 20 dB attenuation extended from 3.42 GHz to 12 GHz. The spurious passband suppression up to six harmonics (5fc) is achieved for the proposed design. The addition of two parasitics DGS elements in the ground plane leads to suppression of the undesired harmonics and thus to improve the stopband. The size of the whole structure is less as (0.44λgx0.26λg) with λg = 68 mm. The proposed filter is useful for microwave L band, GPS system, and RADAR applications
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    Compact, low insertion loss and Ultra-Wide rejection bandwidth microstrip Low-Pass filter
    (2013) Challal, Mouloud; Boutejdar, Ahmed; Dehmas, Mokrane; Azrar, Arab
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    Design and fabrication of a novel quadruple-Band monopole antenna using a U-DGS and open-Loop-Ring resonators
    (2017) Boutejdar, Ahmed; Challal, Mouloud; Bennani, Saad Dosse; Mouhouche, Faiza; Djafri, Kahina
    In this Article, a novel quadruple-band microstrip patch antenna is proposed for the systems operating at quad-band applications. The antenna structure is composed of modified rectangular patch antenna with a U-shaped defected ground structure (DGS) unit and two parasitic elements (open-loop-ring resonators) to serve as a coupling-bridge. The proposed antenna with a total size of 31×33 mm2 is fabricated and tested. The measured result indicates that the designed antenna has impedance bandwidths for 10 dB return loss reach about 180 MHz (4.4–4.58 GHz), 200 MHz (5.4–5.6 GHz), 1100 MHz (7.2–8.3 GHz), and 700 MHz (9.6–10.3 GHz), which meet the requirements of the wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX), C and X bands applications. Good agreement is obtained between measurement and simulation results
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    A simple transformation from lowpass to bandpass filter using a new quasi-arrow head defected ground structure resonator and gap-J-inverter
    (Wiley Periodicals, 2016) Boutejdar, Ahmed; Abd Ellatif, W.; Ibrahim, A. A.; Challal, Mouloud
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    A novel band-stop filter using octagonal-shaped patterned ground structures along with interdigital and compensated capacitors
    (2011) Boutejdar, Ahmed; Challal, Mouloud; Azrar, Arab
    This paper presents a novel compact microstrip band-stop filter (BSF) based on octagonal defected ground structure (DGS) along with interdigital and compensated capacitors. The proposed BSF has lower and higher cut-off frequencies of 3.4 GHz and 5.3 GHz, respectively. A comparison between simulation and measurement results confirms the validity of the BSF configuration and the design procedure. The compact filter occupies an area of (0.45g × 0.35g) with g = 0.044 m on an r = 3.66 substrate and shows a 44% bandwidth ( 2GHz) and a return loss of 0.1 dB. The experimental results show the excellent agreement with theoretical simulation results