Browsing by Author "Fertas, Khelil"

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A Bandpass Filter with Triple-Narrow Notch Bands Based on Metamaterials SRR Configurations for UWB Applications
(nternational Academy of Microwave and Optical Technology (IAMOT), 2024) Aissioui, Mohamed; Kendil, Djamel; Fertas, Khelil; Fertas, Fouad
This paper presents a bandpass filter (BPF) with three narrow notched bands designed for ultra-wideband (UWB) applications. Initially, a basic UWB BPF is designed using a microstrip multimode resonator (MMR) with an open stepped impedance stub loaded at its center. Following that, the Split-Ring Resonator (SRR) is used to generate a triple narrow notched band, allowing undesired signals to be rejected. The frequency range is 2.81 GHz to 10.2 GHz. Beyond this range, there is a strong rejection. Notably, three narrowly notched bands at 5.29, 5.83, and 7.99 GHz are used to achieve in-band interference cancellation, with - 3dB fractional bandwidths of 2.64%, 2.91%, and 1.77%, and rejection levels of -17.15 dB, -11.65 dB, and -11.56 dB, respectively. This filter simultaneously has three main advantages: it is simple, rejects unwanted signals within the bandwidth without affecting the adjacent signals, and achieved high selectivity, the simulation and measurement results show a good agreement, demonstrating effective filtering performance, with a compact dimension of 25.9 x 13.7 mm2.
A Compact Slot-Antenna with Tunable-Frequency for WLAN,WiMAX, LTE, and X-Band Applications
(2020) Fertas, Fouad; Challal, Mouloud; Fertas, Khelil
In this paper, a new monopole compact antenna with tunable frequency fed by a coplanarwaveguide (CPW) for WiMAX, WLAN, LTE bands, and X-band satellite communication system ispresented. This is achieved by adequate combination of a new radiating patch element along with slotsand switches. The simulation and measurement results show that depending on ON/OFF states, theproposed reconfigurable antenna, printed on an FR4 substrate, can operate in four applicable frequencybands, i.e., [2.37–2.75 GHz], [3.15–4.08 GHz], [4.48–5.92 GHz], and [6.69–8.31 GHz]. Very interestingresults for the reflection coefficient, current distribution, and radiation pattern of the antenna arepresented and discussed. The measured results are in good agreement with the simulated ones
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
Design of miniaturized tri-band antenna based on differential evolution algorithm
(John Wiley and Sons Inc, 2023) Fertas, Fouad; Fertas, Khelil; Denidni, Tayeb A.; Challal, Mouloud
A novel highly miniaturized triple band structure based on Z-slots-shaped antenna is presented in this letter, with only 0.0015 (Formula presented.) footprint, where (Formula presented.) is the free space wavelength at 1.3 GHz. The proposed design can generates three resonant frequency bands (1.3–1.62 GHz), (2.22–2.59 GHz), and (3.24–3.65 GHz) with −10 dB reflection coefficient, a triple band function is achieved by etching tow connected Z-shaped-slots in the radiating element and the differential evolution algorithm is then used to control the currents path, the prototype of the proposed antenna is printed on a single substrate layer and fed via coplanar waveguide CPW technology. The measured and simulated results are in good agreement, and validate the design principle, the results show that the antenna has a compact size (19.5 × 17.6 mm2), aside from its planar design, simple manufacturing, and low cost to fabricate, this antenna exhibits stable omnidirectional radiation patterns in E plane as well as bidirectional radiation patterns in H plane, making it an ideal device for multiband applications
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
Development of non-conventional super-UWB antenna based on genetic algorithm optimization
(Institute of Electrical and Electronics Engineers Inc, 2023) Fertas, Khelil; Fertas, Fouad; Maamria, Tarek
This paper presents, an improved applied approach using genetic algorithm optimization for super-ultra wide band antenna. The intended antenna is optimized to operate from 2.8 GHz to more than 40 GHz and suggested for UWB wireless communications include 5G applications. Improving the impedance bandwidth is achieved by optimizing appropriate non-conventional defected ground structure (DGS) filter. The optimized non-conventional filter consists of a matrix of rectangular shapes where each one is allocated by either conducting or non-conducting property. The process is based in a code developed using visual basic script of CST microwave studio. Additionally, the optimized form can be automatically achieved without designer intervention. The simulated results for reflexion coefficient, current distribution, radiation pattern and gain are presented and discussed
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
A novel miniaturized V-shaped monopole antenna for GSM/WiMAX/WLAN applications
(De Gruyter, 2023) Fertas, Khelil; Fertas, Fouad; Challal, Mouloud; Denidni, Tayeb A.
This paper presents a novel miniaturized triple band V-shaped antenna (VSA). The miniaturization and the triple-band operation are obtained by performing two V-shaped turns on the metallic strip. The proposed antenna is printed on a single FR4 substrate and fed using the coplanar waveguide (CPW) technique. It operates in three frequency bands, [1.6–1.95 GHz], [2.8–4.4 GHz] and [5.4–5.8 GHz], with stable bidirectional radiation patterns in both E- and H-planes. A prototype of the designed antenna is fabricated and tested where the observed good agreement between simulated and experimental results indicates that the proposed structure, having a reasonably compact size of 0 . 0166 λ 2 0 , is suitable for GSM [1800 MHz], WiMAX [3.4–3.77 GHz] and WLAN [5.725–5.825 GHz] applications
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