M. GARAH Messaoud

MCA

Directory of teachers

Department

Departement of ELECTRONICS

Research Interests

telecommunication

Contact Info

University of M'Sila, Algeria

Email : messaoud.garah@univ-msila.dz

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Recent Publications

2024-10-31

Design and Parametric Analysis of a Rat-Race Power Divider for 5G Applications

Power dividers, including rat-race divider, play a crucial role in wireless communication systems. The rat-race divider has been known in microwave engineering for many decades, which is used in numerous applications such as Mixers, power dividers/combiners, phase shifters, and baluns. To use this rat-race coupler as a power divider, an input signal is applied at one port, the outputs at two other ports are equal in magnitude, but 180 degrees out of phase. This work presents a parametric study of a conventional rat-race coupler, which is intended for 5G lower band applications, using the CST simulator. The parametric study aims to demonstrate the impact of certain parameters such as physical dimensions and electrical properties on the characteristics of our designed rat-race in terms of bandwidth, power ratio, and isolation. The proposed structure of standard rat-race power divider with its four ports operates at the frequency of 3.5 GHz.
Citation

M. GARAH Messaoud, (2024-10-31), "Design and Parametric Analysis of a Rat-Race Power Divider for 5G Applications", [international] 2024 IEEE International Multi-Conference on Smart System & Green Process , Djerba, Tunisia

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2024-10-01

Design of Coupled-Line Wilkinson Power Divider for UMTS mobile applications

A power divider is a critical passive device, which is commonly used in microwave systems. This microwave component splits the input power, evenly or unevenly, into several smaller output powers. In this paper, we present a design of a coupled-line Wilkinson power divider (WPD) for UMTS mobiles applications. This divider consist two (λ/4) transmission lines and an isolation resistor R, which is connected between output ports. The main disadvantage of this structure is large size and narrow band, especially at lower frequencies. The proposed design composed a signal coupled line to replace the two (λ/4) transmission lines in conventional WPD and one isolation resistor R. The use of a coupled line, in our WPD, offers many advantages compared to the standard WPD including compact size, wide bandwidth, low profile and high isolation. The design was printed on a Rogers RO4003C with an ɛᵣ=3.55 and a thickness of 0.813 mm. Simulations results indicate that the proposed WPD presents low return losses in all ports and high isolation between output ports over the third-generation mobile band.
Citation

M. GARAH Messaoud, (2024-10-01), "Design of Coupled-Line Wilkinson Power Divider for UMTS mobile applications", [international] 2024 International Conference on Advances in Electrical and Communication Technologies (ICAECOT) , Setif, Algeria

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2024-05-30

A Wideband and High Isolation GYSEL Power Divider for Wireless communication

Power divider/combiners are among the most commonly used passive devices in the microwave and millimeter wave systems for modern communication. This paper presents simulation of a wideband GYSEL power divider for wireless applications. The GYSEL PD is a three-port device with matched ports and isolated outputs, suitable for high power applications through the use of two shunt-terminated resistors. The proposed power divider consists of transmission line sections with different characteristic impedances and two grounded resistors. The electrical lengths of all the TLs sections are 90º at the design frequency. The divider network is designed using Computer Simulation Technology software by applying proposed GPD design. The GPD was designed on a Rogers’s RO4003C substrate with dielectric constant of 3.55. The thickness of the substrate is 0.508 mm and loss tangent of 0.0027. The proposed GYSEL power divider is printed on a substrate with a size of 35 x 30 mm2. The simulated results of the proposed divider show good return loss, insertion loss and isolation performance across the band from 3.4 to 3.6 GHz; with central frequency at 3.5 GHz. GYSEL power divider can split an incoming signal into two parts successfully. The measured input return loss (S11) are better than -15 dB, and output return loss (S22, S33 ) is better than -20 dB across the wide-band range. The isolation is greater than -30 dB with a very wide band, from 3.4 to 3.6 GHz. In addition, the power is divided equally between output ports with the same phase. This new structure is suitable for wideband, high isolation, and high power applications.
Citation

M. GARAH Messaoud, (2024-05-30), "A Wideband and High Isolation GYSEL Power Divider for Wireless communication", [international] International Conference on Applied Sciences (ICAS - 2024) , Travnik, Bosnia and Herzegovina

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2024-05-16

Design of Coupled-Line Wilkinson Power Divider for Wireless Communications

A power divider (PD) is a fundamental component in wireless communication systems. This microwave component divides the input power equally or unequally into several smaller outputs. There are many types of PDs in microwave domain such as Wilkinson power divider (WPD), GYSEL power divider (GPD) and others, however, WPDs are commonly used in microwave electronics. These dividers typically operate at a single frequency band and utilize two quarter-wavelength (λ/4) transmission lines and one isolation resistor. The standard WPD distributes power equally with minimal loss, presents reciprocity as it behaves similarly in both directions, and provides high isolation between the output ports. This paper presents the design of a WPD with coupled lines for wireless applications. The coupled lines offer many advantages to the standard WPD in terms of wide operating frequency range, compact size, and low profile. The proposed WPD operates at 2.1 GHz third generation mobile applications. The designed Wilkinson PD was printed on a Rogers' RO4003C substrate with a dielectric constant of 3.55. The substrate thickness is 0.813 mm, and a copper thickness of 35 μm. Based on the simulation results, it is shown that the proposed WPD presents low return losses in all the ports and high isolation over the third-generation mobile band.
Citation

M. GARAH Messaoud, (2024-05-16), "Design of Coupled-Line Wilkinson Power Divider for Wireless Communications", [international] 3rd International Conference on Engineering, Natural and Social Sciences ICENSOS 2024 , Turkey

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2023-10-21

Design and Parametric Study of a GYSEL Power Divider for Mobile Applications

Power dividers are widely used in antenna arrays feeding, radar systems, communication systems, and medical imaging systems, which makes it indispensable microwave components. These power dividers have several design advantages such as low cost, lightweight and manufacturability. Among these power dividers, one can cite Gysel power dividers which are used for antenna array feeding with high power-handling capability. This work presents a parametric study of a standard design of a Gysel divider intended for mobile applications. To design this power divider, the ADS Momentum simulator has been used. During this parametric study, our goal is to show the effect of some design parameters such as physical dimensions and electrical properties on some GPD characteristics in terms of bandwidth, power ratio, and isolation. The proposed structure consists of standard Gysel power divider of three ports and operating at the frequency of 2.4 GHz.
Citation

M. GARAH Messaoud, (2023-10-21), "Design and Parametric Study of a GYSEL Power Divider for Mobile Applications", [international] NILES 2023 , Nile university Egypt

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2023-06-18

Carte commande de la machine à laver nge

Making a control board for a washing machine involves the following steps: designing a detailed electrical diagram, choosing a suitable microcontroller, developing the program corresponding to the washing cycle steps and interacting with sensors and actuators, creating the board by placing components on a PCB and connecting them, and finally testing the board to make sure it works properly. This systematic approach aims to ensure optimal performance and reliability of the control system
Citation

M. GARAH Messaoud, (2023-06-18), "Carte commande de la machine à laver nge", [national] msila

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2022-02-01

Parametric Study and Optimization of a Dual-BandFour Port Wilkinson Power Divider

Among the most used power dividers in the field
of telecommunications (antenna networks, mobile networks,
radar system, satellite communications,military applications
and even missile guidance) we can mention the Wilkinson
power divider.In the present paper, a dual band Wilkinson
power divider with four ways will be designed.
In order to investigate the relationship between the physical
dimensions of the Wilkinson power divide rwith its
characteristics in terms of operational frequency and
bandwidth, a parametric study of a Wilkinson power
divider will be presented.To design the dual band four-way
Wilkinson power divider (WPD), ADS Momentum
simulator is used. The simulator uses a genetic algorithm
(GA) algorithm to optimize the structure of the proposed
WPD.The proposed power divider is developed to achieve
dual bands requirements of WLAN applications. To obtain
these frequency specifications in the proposed WPD, many
transmission lines sections are added. The transmission lines
are printed on FR4 (Flame Resistant 4) substrate of
dielectric constant εr of3.4 with loss tangent of 0.0023. The
proposed circuit exhibits good characteristics at WLAN
frequencies (2.45GHz & 5.8 GHZ) in terms of return loss
and isolation.
Citation

M. GARAH Messaoud, (2022-02-01), "Parametric Study and Optimization of a Dual-BandFour Port Wilkinson Power Divider", [national] International Journal of Information Science & Technology , https://innove.org/ijist/index.php/ijist/article/view/176

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2022

A novel design of a reconfigurable power divider with stubs for mobile applications

Nowadays, the world knows a huge revolution in telecommunications, which has led to the need to integrate many services, such as long-term evolution (LTE), 5G, wireless local area network (WLAN), and Bluetooth, in one receiving and transmitting device. In the same way, all active and passive microwave circuits must be compatible with the integration of services, including the power divider, which is the subject of our work. This passive component is used in several fields such as medicine, surveillance, radar systems and others applications. Wilkinson divider is one of the most prominent power dividers, it is classified as narrow-band power divider and it is a very useful component in mobile applications (2.4 and 5.8 GHz). In this work, a reconfigurable 4-ports Wilkinson divider is designed using PIN diodes and simulated using connected speech test (CST) simulator software. This designed divider can easily modify the operation mode by activating or disabling the PIN diodes.
Citation

M. GARAH Messaoud, Farid Djahli, , (2022), "A novel design of a reconfigurable power divider with stubs for mobile applications", [national] Indonesian Journal of Electrical Engineering and Computer Science , ijeecs

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2020-12-12

A Dual Band Four Ports WILKINSON Power Divider Design

In the present paper, a dual band four-way Wilkinson power divider (WPD) using a genetic algorithm (GA) optimization is designed and simulated using ADS Momentum simulator. The proposed power divider is developed to support dual bands of WLAN applications. The present power divider is formed by many transmission lines sections. The transmission lines are printed on FR4 (Flame Resistant 4) substrate of dielectric constant εr of3.4 with loss tangent of 0.0023. The proposed circuit exhibits good characteristics at WLAN frequencies (2.45GHz & 5.8 GHZ) in terms of return loss and isolation.
Citation

M. GARAH Messaoud, (2020-12-12), "A Dual Band Four Ports WILKINSON Power Divider Design", [international] IEEE 6th International Congress on Information Science and Technology (CiSt), Morocco , Morocco

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2019

Priority Management of the Handoff Requests in Mobile Cellular Networks

Due to the motion of mobile station with respect to the base station, the handover is required frequently in the communication process. In this paper, assuming that the user location and speed can be determined, we propose a suitable scheme for managing a queuing of handover requestes in wireless cellular network. The principle of the proposed method is the use of a separate queue for each transceiver in the cell (3TRX per cell) instead of using a single one and we consider that handover request to cell is queued with dynamic priority discipline; highest priority (head of the queue), least priority (joins the end of the queue). Fixed channel allocation is considered and call blocking probability (CBP), handover failure probability (HFP) are obtained as a results. In order to choose the best model which reduces significantly the handover failure probability, a comparison between the proposed model and the classical one is considered. Simulation results highlight that the newly proposed architecture can guarantee superior performance with respect to its competitor.
Citation

M. GARAH Messaoud, (2019), "Priority Management of the Handoff Requests in Mobile Cellular Networks", [national] Procedia Computer Science , elsevier

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Optimization of Suitable Propagation Model for Mobile Communication in Different Area

In this paper, the most widely used empirical path loss models are compared to real data; the most appropriate one (COST-231) has been optimized using three different algorithms to fit measured data for mobile communication system. The performance of the adjusted Cost-231 model obtained by the proposed methods is then compared to the experimental data. The concert criteria selected for the comparison of various empirical path loss models is the Root Mean Square Error (RMSE). From numerical simulations, it was noticed a significant improvement in the prediction made by the proposed algorithm with a slight superiority of Invasive weed Optimization algorithm in term of lower RMSE value in one hand and in term of convergence speed on the other hand compared to PSO and ABC algorithm
Citation

M. GARAH Messaoud, djouane lotfi, , (2019), "Optimization of Suitable Propagation Model for Mobile Communication in Different Area", [national] International Journal of Information Science & Technology , http://www.innove.org/

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2018

Empirical Path Loss Models Optimization for Mobile Communication

In this paper, the most widely used empirical path loss models are compared to real data; the most appropriate one (COST-231) has been optimized using three different algorithms to fit measured data for mobile communication system. The performance of the adjusted Cost-231 model obtained by the proposed methods is then compared to the experimental data. The concert criteria selected for the comparison of various empirical path loss models is the Root Mean Square Error (RMSE). From numerical simulations, it was noticed a significant improvement in the prediction made by the proposed algorithm with a slight superiority of PSO algorithm in term of lower RMSE value in one hand and in term of convergence speed in the other hand compared to GA and N-M method.
Citation

M. GARAH Messaoud, lotfi djouane, , (2018), "Empirical Path Loss Models Optimization for Mobile Communication", [international] 2018 IEEE 5th International Congress on Information Science and Technology (CiSt) , Marrakech, Morocco

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