Ali El Alami

• Enseignant- chercheur chez Faculté des Sciences et Techniques - Errachidia
• Professor at Université Moulay Ismail de Meknes

This work studies maximum power point tracking (MPPT) of a photovoltaic (PV) generator, in which a robust Integral Quasi-Sliding Mode Controller was applied to track the MPP by modifying the duty cycle of a DC-DC boost converter. The PV system consist of a PV array, a DC-DC boost converter and a resistive load. The present work includes a stability...

This document introduces the creation of an innovative bandpass filter with Ultra-Wideband (UWB) designed for the fifth-generation applications. This filter employs an H-shaped resonator positioned at the center of a rectangular resonator, both integrated on a substrate Rogers RT/duroid 5880 type, featuring a dielectric constant of 2.2, an attenuat...

Metamaterial technology indeed holds great promise for enhancing wireless communication, especially in the development of advanced filters and devices. The use of metamaterials for filter design is an exciting and promising area of research, driven by their exceptional properties and potential for revolutionizing var- ious technological applicati...

This paper presents the design of a high isolation miniaturized compact diplexer model based on Band-Pass Filter technique, which is intended especially for a lower band [1.7 GHz to 1.9 GHz] fixed for 4G-LTE and a higher band [3.4 GHz to 3.8 GHz] fixed for 5G Sub-6 GHz. The designed diplexer is very compact with an overall size of 11× 36.49 mm2. Th...

A simple procedure for designing a highly selective microstrip bandpass filter of second order is presented in this paper. The proposed filter is composed of two principal square open-loop resonators and designed with planar structures on a Roger substrate. It is intended for 5G applications, especially for Sub-6 GHz range frequency [3.5–3.8 GHz]....

Purpose This paper aims to present the design, fabrication and analysis of a wideband, enhanced gain 1 × 2 patch antenna array with a simple profile structure to meet the desired antenna traits, such as wide bandwidth, high gain and directional patterns expected for the upcoming fifth-generation (5G) wireless applications in the millimeter wave ban...

The goal of this paper is to design and develop of an ultra-wideband (UWB) hybrid coupler with a variable phase shift (90°–180° and vice versa) which operates around the resonant frequency of 3.8 GHz required for 5G applications. The design approach is based on the microstrip waveguide technique with localized lumped elements to control the phase s...

A single band printed antenna with a modified E-shaped structure is proposed for 5G applications at 28 GHz band. The suggested antenna has been constructed on a 5.5 × 4.35 mm2 FR-4 substrate (εr=4.4 and h=1.6mm) through slot loading technique. The incorporation of rectangular and tiny square shaped slots has improved the resonance and radiation cha...

The main purpose of this letter is to develop a miniaturized ultra‐wideband hybrid coupler with an adjustable phase shift (90°‐180° and vice versa) that operates around the resonant frequency of 3.8 GHz with a fractional bandwidth of 26% required for 5G applications. The design approach is based on a microstrip waveguide technique with localized lu...

A miniaturized ultra wideband (UWB) planar array antennas for C-band aircraft weather RADAR applications is presented. Firstly, the effect of the ground plane is studied. Later, the realization and experimental validation of the geometry that has an UWB characteristic are discussed. This array antennas is composed of a twenty-four radiating element...

A 4–8 GHz ultra wide band microstrip array antennas with improved gain for weather Radar applications was designed and fabricated. The microstrip radiating elements of the proposed array antennas are powered using a T-junction power divider with quarter wave-transformer impedance for a best matching. The design of this array antennas is based on th...

This paper presents the design and simulation of RFID adaptive antenna array for object detection system or living things in movement in a very limited space. The proposed antenna array is composed of four identical elements which are connected in parallel with a microstrip line in the form « T » having a power port adapted to 50 Ω. This array is m...

This paper presents an Ultra Wide Band (UWB) microstrip planar array antennas for weather RADAR application which covers the C-Band. The proposed array antenna is composed of T-junction power divider which has a role to divide the power equally to all antenna elements. This array is etched onto a FR4 printed circuit board with an overall size of (1...

In this paper, a compact linear array antennas with ultra wideband (UWB) end-fire characteristic for radar applications is proposed. The array antenna consists of four rectangular antenna element with a partial ground plane and a coplanar waveguide (CPW) transmission line of 50 ohm. The proposed array antennas is etched onto a FR4 printed circuit b...

The aim of this paperis to increase the operating distance of the WiMAX implementation by increasing the gain and the directivityusing microstrip array antenna. Wepresent thedesign of simple 2X2 microstrip arrayantennaoperating at5.38 GHz for WiMAX applications. Thedesign is based on a single layer FR4 substrate, having a loss tangentofퟎ.ퟎퟏ6 anddie...

This paper discusses the investigation of reflection coefficient enhancement for microstrip Patch Array Antenna 2×2 by putting up a slot and stub on the patch. Here, the antenna is designed to work at center frequency around 5.38 GHz for WiMAX applications. It is designed on FR4 laminate with relative dielectric constant of 4.05, thickness substrat...

In this paper, we propose to study and optimize a new structure of a patch antenna linear array to four identical elements. This array is connected in parallel with a microstrip line in the form « T » having a power port adapted to 50 Ω and intended for Radio Frequency Identification applications. The insertion of slots in the structure of the patc...

The main objective of this work is to make a comparative study of the radiation pattern of circular patch antenna excited in transverses magnetics modes. This Study is based on the model of the resonant cavity approach and intended for RFID application around a resonance frequency of 2.45 í µí°ºí µí°»í µí± §. The simulation results show that the fa...

The main objective of this work is to optimize the radiation performances of square shaped patch antenna. This antenna is excited by microstrip line having a power port adapted to 50 í µí»º and intended for RFID reader. The slots inserted at the edges of the radiating element have a direct and positive impact on improving the radiation characterist...

In this paper, we propose a new structure patch antenna excited by two identical microstrip lines having a common feeding adapted to 50 ohm and intended to applications of Radio Frequency Identification (RFID). The slots inserted at the patch antenna have a direct impact on improving the radiation characteristics in terms of reflection coefficient,...

L'objectif principal de ce travail consiste à modéliser quelques caractéristiques de rayonnement d'une antenne microrutran circulaire excitée par le mode d'ordre supérieur TM21 pour des applications d'ldentification par Radio Fréquence (RFID). L'étude a montré que les substrats ayant de constantes diélectriques élevées présentent des résultats nett...

A design of a novel single-patch wide-band microstrip antenna: the 2-shaped patch antenna for wireless communications is proposed. Two opposite parallel slots are incorporated into the patch of a microstrip antenna to expand it bandwidth. The slot length, width and height of substrate are optimized to achieve a wide bandwidth. Finally, a 2-shaped p...

The main objective of this paper is applying the cavity model to simulate the radiation characteristics of a circular patch antenna excited by the dominant mode TM 11 and higher order modes (TM 21, TM 31, TM 41 , TM 51 and TM 61) for RFID applications. The study showed that the substrates having the high dielectric constants presents the better res...

This article introduces some of the basic concepts of patch antennas. The main focus will be on optimizing of dimensions of patch antenna for WIMAX application with resonance frequency of 3.55 GHz. This design is simulated with HFSS program that based on finite element method. This method gives good impedance bandwidth of the order of 3.94%, a gain...

In this paper, we present the design and optimization a rectangular patch antenna excited by coaxial probe for RFID applications and which operates at the central frequency of 2.4 GHz. The design of the proposed antenna was simulated using the software Ansoft HFSS (High Frequency Structure Simulation). This design gives us a return loss reached at...

The aim of this paper is applying the resonant cavity method to a circular Microstrip antenna excited by the higher mode TM 21 and which operates at the central frequency of 2, 45 GHz. The use of this application (only for substrates having high dielectric constant) gave us the opportunity to have such directivity and input resistance (impedance) w...