Publications Scientifiques

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

Browse

Author: search.filters.author.Challal, MouloudHas files: Yes

Search Results

Now showing 1 - 10 of 51
  • No Thumbnail Available
    Item
    Compact CPW-fed Antenna with Controllable WLAN Band-rejection for Microwave Imaging
    (Advanced Electromagnetics, 2024) Mokhtari, Mokhtar; Oussaid, Rachid; Mansoul, Ali; Challal, Mouloud
    This work presents the design and experimental validation of a compact frequency-reconfigurable coplanar waveguide (CPW)-fed ultra-wideband (UWB) antenna for application in microwave imaging systems with a capability to switch between UWB modes, with and without WLAN band-notched features. The suggested topology and design process are used to achieve an enhancement in the bandwidth using T-shaped slots between the feedline and the ground plane of the antenna, whereas the WLAN band is rejected using an open loop resonator (OLR) placed on the antenna backside. Switching between UWB with and without WLAN band-notched modes is performed using a single PIN diode. The simulation results corroborate well with the experimental data and clearly show an interesting frequency reconfigurable behavior for use in microwave imaging applications. The antenna performance simulation and analysis model is presented for breast tumor detection.
  • No Thumbnail Available
    Item
    Wideband Printed Antenna for Wireless Communication Systems
    (Institute of Electrical and Electronics Engineers Inc, 2023) Challal, Mouloud
    A compact and low profile printed monopole antenna for applications in wireless communication systems (WCS) is presented in this paper. The antenna design is based on a rectangular patch along with a V-shaped staircase slot on the top side of the substrate and a partial ground plane on the bottom side. This design technique allows obtaining a wideband operation with bandwidth extended from 2 GHz to more than 8 GHz. The investigated antenna shows a monopole radiation pattern in the H-plane and a bisectional radiation pattern in the E-plane. The measurement and simulation results are in a quite good agreement, which indicates that the antenna is appropriate for WCS.
  • No Thumbnail Available
    Item
    Reconfigurable UWB monopole antenna with WLAN Band-Notch characteristic
    (Institute of Electrical and Electronics Engineers Inc, 2023) Fertas, Khelil; Fertas, Fouad; Challal, Mouloud
    this paper presents a reconfigurable WLAN stopband UWB-monopole antenna with an inverted II-shaped slot embedded at the lower part of the ground plane, and a PIN diode. The proposed antenna has the capability to work in the frequency range of 3.1-10.6 GHz with and without notched-band. To achieve the reconfigurability of a rejected band, a PIN diode is inserted in the middle length of inverted II-shaped slot. The ON/OFF states of the PIN diode can change the antenna performance. The presented antenna is designed on Teflon substrate of dielectric constant 2.5 with loss tangent of 0.002. Good performance regarding reflection coefficient, gain and radiation patterns are presented and discussed
  • No Thumbnail Available
    Item
    A New Microstrip Dual-Band Bandpass Filter Design using SIRs and Open Stubs
    (2021) Lahmissi, Ahmed; Challal, Mouloud; Tayeb, Ahmed Denidni
    A novel design of microstrip dual-band bandpass filter is presented in this article. The structure contains stubs loaded feeding and Stepped Impedance Resonators. The design allowed achieving a harmonic free characteristic for the filter and achieving a good and stable out of band attenuation. The measured return losses are better than 20 dB and the measured insertion losses are around 3dB in both passbands. The outof- band attenuation levels are 40dB up to 10GHz. The overall measured results are in good agreement with simulations and the filter dimensions are 18×16 mm². The filter is designed to work at the center frequencies 3.45 GHz and 5.75 GHz to suit WLAN and WIMAX applications
  • No Thumbnail Available
    Item
    Multi-L slots antenna for multiband applications
    (IEEE, 2019) Fertas, Fouad; Challal, Mouloud; Fertas, Khelil
    This research paper present a multi-L shaped slots antenna (MLSSA) for multiband operation, the aim of this study is to design small and simple profile antenna that can operate in multiband frequency, the proposed antenna contain a rectangle microstrip patch with a small overall size of 27.4×24 mm 2 and a transmission line with 50 Ω coplanar waveguide (CPW), the bands characteristics are realized by introducing a six of L-shaped slots in radiating element, the prototype and proposed antenna have been constructed and experimentally studied. The measured S11 shows a good agreement with the simulated one, thereby the antenna respond at five frequency bands which are (2.36-2.58 GHz), (3.07-4.01 GHz), (4.25-5.27 GHz), (5.9-6.29 GHz) and (7.01-S.l GHz) to meet requirements for WILAN (5.15-5.S75 GHz), WIMAX (3.3-3.7 GHz), LTE band (3.2-3.3 GHz) applications
  • No Thumbnail Available
    Item
    Development of a novel UWB planar antenna using a genetic algorithm
    (IEEE, 2017) Fertas, Khelil; Kimouche, Hocine; Challal, Mouloud; Ghanem, Farid
    This paper introduces a new design and optimization method of ultra wide band (UWB) printed antenna using a genetic algorithm (GA). The proposed antenna consists of a radiating patch element with an area divided into 2 mm square cells where each cell is allocated by either conducting or nonconducting property. The presented antenna is designed to operate from 2.4 GHz to 9.8 GHz. Numerical results for the return loss, radiation pattern and gain of the antenna are presented and discussed. The introduced antenna was fabricated, and the measured results are in good agreement with the full-wave simulated ones
  • No Thumbnail Available
    Item
    Design and implementation of a miniaturized CPW-Fed microstrip antenna for triple-band applications
    (IEEE, 2017) Fertas, Fouad; Challal, Mouloud; Fertas, Khelil
    In this paper, a novel and low profile CPW-Fed triple-band microstrip antenna for wireless applications is proposed. The proposed antenna is implemented on FR4-Epoxy dielectric substrate with dimensions of 24×40 mm 2 and generates three desired resonant frequencies at about 2.44 GHz, 3.56 GHz and 5-6 GHz for WLAN and WiMAX applications. Numerical results for the return loss and 2D radiation patterns of the antenna are presented. Good agreement between measured and simulated results is achieved. The obtained results represent that the proposed antenna with good performances can be suitable for various applications such as future developed technologies and handheld devices
  • No Thumbnail Available
    Item
    Band-notched ultra-wideband bandpass filter design using multiple-mode resonator and stepped impedance stub loaded
    (IEEE, 2017) Louazene, Hassiba; Challal, Mouloud; Boulakroune, M'Hamed
    A novel ultra-wideband (UWB) bandpass filter (BPF) with notched band is proposed in this paper. The filter is consisting of two symmetrical multiple-mode resonators (MMRs) connected to quarter-wavelength interdigital lines. This filter provides, in the passband, an insertion loss of 0.19 dB and a return loss greater than 22.6 dB. Furthermore, the filter occupies an area of 11.54 × 3.11 mm 2 . In this filter design, besides obtaining a uniform in-band transmission response, a notch band centered roughly 5.2 GHz is created by modifying one of two arms in the coupled-line sections. The simulation results are in satisfactory agreement with the measurement ones reported elsewhere. The proposed UWB-BPF presents good performance in terms of insertion loss, return loss, fractional bandwidth and compact size than those reported in the literature
  • No Thumbnail Available
    Item
    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
  • No Thumbnail Available
    Item
    A novel microstrip dual-band bandpass filter with wide and deep stopband using modified SIRs
    (IEEE, 2017) Lahmissi, Ahmed; Challal, Mouloud
    In this article, a magnetically coupled dual-band bandpass filter (DB-BPF) using stepped impedance resonators (SIR) is presented. The obtained passbands have elliptical function response with good stopband rejection levels. In this filter design, both passbands can be controlled independently while keeping the same filter performance. These independency in bandwidth shifting, make the design flexible to meet many applications. The proposed filter has a compact size of 12.7×32mm. The measurement results are in good agreement with the simulations ones