Browsing by Author "Khodja, Khalida"

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Contribution to the design of new antenna structure more efficient for 5G communications systems
(Université M'Hamed Bougara Boumerdès : Faculté de Technologie, 2025) Khodja, Khalida; Atia, Salima(Directeur de thèse)
This thesis explores key advancements and challenges in telecommunications and antenna design, focusing on the evolution towards 5G networks and the utilization of millimeter-wave (MMW) frequencies. The first chapter provides a comprehensive overview of 5G networks, emphasizing the unique propagation characteristics and transformative potential of MMW technology. It investigates the technological innovations required to optimize MMW spectrum for ultra-high-speed data transmission. The second chapter presents a comprehensive overview of the evolution of wave guiding techniques including their fundamental principles and common applications, detailing their historical development, advantages, and drawbacks. It traces the advancements from traditional hollow waveguides to more recent innovations designed to meet the increasing demands of high-frequency communication systems, particularly in the MMW band. It also explores the limitations of these conventional techniques that have spurred the development of novel waveguide technologies. Among the various emerging techniques, this chapter highlights the Ridge Gap Waveguide (RGW) technology as the most promising solution for MMW applications and discusses in detail its main characteristics, while displaying its key advantages. Actually, the RGW's ability to overcome many of the challenges faced by traditional waveguides are emphasized, showing that the RGW's unique ridge structure offers a significant improvement in performance and versatility, which makes it a superior candidate for next-generation communication systems. Additionally, this chapter addresses the current drawbacks of RGWs and it concludes with a critical evaluation of RGW technology in the context of its application to advanced communication network. This overview establishes a foundational understanding of wave guiding techniques and positions RGW technology as a leading candidate for addressing the demands of modern high-frequency communication systems. The third chapter introduces a novel antenna design tailored for the Ka-band frequency range, featuring both dual-band and dual-beam radiation capabilities. This dual-band functionality is realized through a carefully engineered radiating structure that accommodates the different wavelength requirements of each band, ensuring optimal performance and minimal interference. In addition to its dualband capability, the antenna features a dual-beam radiation pattern; this design innovation allows for simultaneous coverage of two separate spatial regions, enhancing the system's flexibility and efficiency. Chapter “four” introduces a miniaturized, high-gain, and highly efficient antenna designed for operation at 60 GHz, leveraging the innovative Double Printed Ridge Gap Waveguide (D-PRGW) technology. The proposed antenna utilizes D-PRGW technology to achieve exceptional performance while maintaining a compact size factor. This design innovation allows for a significant reduction in antenna dimensions without compromising gain or efficiency. By employing a dual-ridge configuration, the antenna effectively mitigates signal losses and enhances power handling capabilities, making it wellsuited for high-frequency applications where space constraints are a major concern. The chapter provides a detailed analysis of the antenna's design, including its geometric parameters, simulation results and experimental measurements that demonstrate the antenna's excellent performance metrics, such as gain, beam width, and efficiency
Design of a compact SWB high gain antenna uysing a fully PEC reflector
(IEEE, 2021) Belazzoug, Massinissa; Khodja, Khalida; Ksouri, Elhachmi; Rebbah, Rabia; Messaoudene, Idris; Chaouche, Youcef Braham; Hammache, Boualam; Denidni, Tayeb A.
In this paper, a high-gain and low-profile super wideband (SWB) antenna is presented. The proposed design consists of an asymmetric coplanar waveguide (CPW)-fed modified Y-shaped monopole antenna. A parasitic patch in the ending of bowtieshaped leads to improve the impedance match performance. Therefore, a fully PEC reflector is included in order to enhance the gain by combining the output and the reflected waves in the boresight direction. An impedance bandwidth of 124% is obtained (4.2-18 GHz for VSWR less than 2) with a very compact size of 0.15λ0×0.22λ0×0.012λ0. Directional radiation patterns for the E and H-planes are achieved. The realized gain of the proposed antenna is enhanced by 3-6.5 dBi over the operating band, and the total efficiency is more than 85%. All these features make the proposed antenna a good candidate for RADAR and WLAN communications
Dual-beam DRA based array for 5G applications
(IEEE, 2021) Khodja, Khalida; Belazzoug, Massinisssa; Atia, Salim; Messaoudene, Idris; Denidni, Tayeb A.
In this paper, a dual-beam array antenna based on triangular dielectric resonator (TDR) is presented for Ka-band applications. It consists of 2×1 radiating elements sharing a common ground plane and plated with a thin copper layer at the upper side. The antenna effectively covers two separate bands (28 GHz and 33GHz) with a double-beam radiation at both operating frequencies. This structure has achieved a return loss lower than -20dB with a corresponding gain of more than 8 dBi at 28GHz and 6dBi at 33GHz, and a high radiation efficiency (≥90%) across each band. The radiation pointing angles are centered at ±28° (28GHz) and ±31° (33GHz) with a wide angular width of more than 30°, respectively
Novel High Efficiency V-Band Pure TEM D-PRGW Antenna for 5G mmWave Applications
(John Wiley & Sons, 2024) Khodja, Khalida; Atia, Salim; Messaoudene, Idris; Belazzoug, Massinissa; Merabet, I.; Melouki, Noureddine; Denidni, Tayeb A.
This paper starts with the proposal of an enhanced version of a planar rectangular slot antenna fed by the quasi-TEM printed ridge gap waveguide (PRGW), attended with a numerical study of a miniaturization procedure showing the limitations of the conventional PRGW-based antennas. Then innovative solution is introducing a new miniaturized pure TEM wide-band slot antenna utilizing double PRGW (D-PRGW) technology; the proposed approach is self-packaged and shows high potential for enhancing antenna performance, particularly in terms of bandwidth, gain, and compactness. This technology is featured with low loss, high performance, and compact size; it consists of surrounding the ridge area with a double layer of electromagnetic band gap (EBG) lattice instead of one to eliminate the surface waves effectively and keep the signal completely confined inside the ridge area with strict minimum rows of EBG. Therefore, a broad impedance matching bandwidth (|S11| ≤ −10 dB) of 33.33% is obtained from 50 to 70 GHz, which covers the unlicensed NR parts (n262; amp; n263) of the V band. Furthermore, the antenna achieves a peak gain of approximately 16 at 65 GHz while the overall efficiency remains above 90% across the entire operating frequency band. The high performance along with the compact size of this novel design makes it a good candidate for 5G wireless communications applications centered around 60 GHz.
Study and simulation of DWDM star topology network
(2018) Bouchafa, Safia; Khodja, Khalida; Zitouni, Abdelkader (Supervisor)
Nowadays, optical networks employing Dense Wavelength Division Multiplexing (DWDM) are the adopted technique used in modern communication networks that can meet the everincreasing demand for bandwidth of the end users. The development of nodal elements, such as Optical Cross-Connects (OXC) for DWDM networks, has led to huge possible network architectures for the optical layer. In this project, we study the effect of the input power, transmission speed, pre- and postcompensation techniques on the performance of an eight channel DWDM star topology operating at wavelength 1550 nm and consisting of a central node to which 64 other nodes are connected. OptiSystem 7.0 is used for building the overall system and carrying out simulations. The performance analysis is based on eye diagrams, Q Factor and simulated Bit Error Rate (BER).
Study and simulation of DWDM star topology network
(2018) Bouchafa, Safia; Khodja, Khalida; Zitouni, Abdelkader(Supervisor)
Nowadays, optical networks employing Dense Wavelength Division Multiplexing (DWDM) are the adopted technique used in modern communication networks that can meet the everincreasing demand for bandwidth of the end users. The development of nodal elements, such as Optical Cross-Connects (OXC) for DWDM networks, has led to huge possible network architectures for the optical layer. In this project, we study the effect of the input power, transmission speed, pre- and postcompensation techniques on the performance of an eight channel DWDM star topology operating at wavelength 1550 nm and consisting of a central node to which 64 other nodes are connected. OptiSystem 7.0 is used for building the overall system and carrying out simulations. The performance analysis is based on eye diagrams, Q Factor and simulated Bit Error Rate (BER).