Adel Asselman

Abdelmalek Essaâdi University | UAE · Department of Physics

Grid connected photovoltaic plant installations have attracted attention globally, owing to the need for the best alternatives to fossil fuels. In these conditions, investigating the performance and reliability of the grid-connected photovoltaic (PV) systems is critical when used in real climate conditions. As one of the best ways to compare and as...

The co-integration of antennas with lighting sources appears as an effective way to distribute broadband networks closer to users, lowering interference and transmitted power, as well as to reduce energy consumption in future lighting systems. We here present an original contribution to the implementation of transparent and invisible antennas with...

Nowadays, Organic Light Emitting Diode (OLED) panels are widely used for displays from smartphone to TV or tablets but, due to numerous qualities (high color rendering index, high efficiency, bendable, no glare, etc.), this kind of light sources is more and more seen as the next generation of wide usage light source. If the color temperature shows...

This paper proposes a high gain array antenna operating in the Ku-band at 17.5 GHz for 5G applications. This new antenna is printed on an FR-4 substrate of thickness h = 0.8 mm and realized by changing the geometric shape of a rectangular patch, obtained by inserting an L-shaped slot to enlarge the bandwidth (1.5 GHz) and to increase the gain. To f...

This article discusses an original contribution to increase the optical transparency of the Transparent Conducting Oxides (TCOs) and to design optically transparent and invisible antennas that can be integrated in OLEDs light source. To validate the proposed technique, the meshed antenna is compared with the full metal antenna in terms of electrica...

In solid-state lighting, the performance of highpower LEDs is depending highly on the junction temperature. Good thermal management is essential for LED packaging. Therefore, a high junction temperature operation leads to failure of light intensity and service life. In this paper, we develop a three-dimensional thermal analysis of a 3.5W multichip...

This work presents a new bendable antenna for worldwide interoperability for microwave access (WiMAX) wireless communication systems. These antennas, transparent and flexible, will be easily integrated into various media and in particular OLED lighting which could be part of the public lighting network of tomorrow as well as on all display media. T...

In this article, an optically transparent antenna, integrated in organic light-emitting diodes (OLEDs), is proposed for sub-6 GHz 5G applications. The concept of the mesh geometry is applied to obtain high optical transparency. To validate this technique, the transparent antenna is compared with the non-transparent in terms of electrical, optical a...

Blue light has proven its impact on melatonin concentration levels, the circadian rythm disruption, body temperature, pupillary reflex and fastening the AMD (Age-related macular degeneration). Humans dialy routine has recently been compromised by the extreme utilization of LED screens (TV, smartphone, computer) that emit a considerable quantity of...

The development of 5G (fifth generation) mobile communication systems was initiated to meet the expected need for higher data rates. In this article, a new 28/38 GHz dual-band “inverted-F” array antenna for 5G applications is proposed. This antenna can be integrated in OLEDs (Organic Light Emitting Diodes) panels which can be used both for lighting...

This paper presents the design of a compact size band patch antenna for 5G wireless communications. This wideband antenna was designed on a glass substrate (12 × 11 × 2 mm3) and is optically transparent and compact. It consists of a radiation patch and a ground plane using AgHT-8 material. The antenna design comprises rectangular shaped branches op...

In this work, a new flexible antenna integrated with OLED light sources is presented for WiMAX wireless communication systems. The proposed antenna was placed on a 100% polyester base with a thickness of 1.5 mm and achieved a high gain. We evaluated and tested its performance, including reflection coefficient, radiation pattern and gain. The flexib...

The luminance degradation studies of OLEDs light sources under thermal and electrical stress conditions are normally achieved in order to estimate the OLEDs lifetime. In this study, the colorimetric parameters have been measured and calculated at different durations to understand the behaviour of OLED’s spectral distribution power over time. The sp...

In this study, we present a new transparent flexible coplanar waveguide (CPW) bandpass filter using polyethylene terephthalate (PET) substrate while the simulation results permit to characterize the filter in terms of bandwidth, S-parameters, and current distribution. The resonator of the filter is implemented using a special compact square ring re...

Blue light effect on the human circadian cycle is not considered in a wide available lighting systems product on the market. The blue part of the white light received by a human act as a switch for the production of the melatonin by the pineal gland and can disrupt the sleeping period. The photopigment so called Melanopsin is responsible of transmi...

A new flexible antenna made entirely from a transparent conductive fabric VeilShield has been designed to be integrated in OLED light sources as well as flexible or rollable displays. It was layered on a 100% polyester support with a thickness of 1.5 mm and achieves a good adaptation and high gain. The simple and flexible patch antenna has been des...

Abstract—In this paper, a new concept of an optically transparent antenna integrated in OLED (Organic Light Emitting Diodes) is proposed for the 5G mobile applications. This proposed antenna is designed for future millimeter-wave (mm-Wave) 5G applications. The proposed optically transparent antenna is a network of micrometric hexagonal cells deposi...

There are very few studies treating, with the same protocol, data arising from several identical photovoltaic systems installed at several sites. Results from the ‘Propre.Ma’ project are reported, they take profit from the combined advantage of having the same solar photovoltaic system in 20 different places in Morocco and, in each place, the same...

Dual resonators in a one-dimensional (1D) electromagnetic band gap (EBG) application into array antenna is investigated as a mean to enhance the directivity and the radiation bandwidth. The directivity increases significantly with a number of patches using 1D-EBG, is obtained 24.44dB for an array of 64 patches. Moreover, the radiation band undergoe...

This paper describes a novel patch antenna operating in Ku-band at 17 GHz for the upcoming fifth generation (5G) cellular communication. A dielectric layer of an Electromagnetic Band Gap (EBG) superstrate is applied above the antenna and four metallic EBGs structures are added for further directivity improvement. AL-shape slot generates the resonan...

In this paper we presented a Metallic electromagnetic band gap antenna operated on the frequency band 5 GHz which it can be suitable for wireless Local Area Network (WLAN). The proposed antenna contains vertical and horizontal M-EBG printed on a FR4 substrate fed by a 50 Ω feed line. The results exhibit that the proposed antenna shows better perfor...

One of the areas of research in Radio Frequency Identification (RFID) systems is the reduction of identification processing time for a number of tags in an RFID reader recognition region. During the last decade, numerous research results concerning anti-collision algorithms have been presented in the literature. Most of them are tree-based protocol...

Aerial imaging has become important to areas like remote sensing, surveying, and particularly in the agricultural application areas. In this paper, we suggest an aerial image segmentation approach based on Markov random field model and Gibbs distributions, we introduce iterative algorithm process to minimize an energy function which incorporate a l...

This paper presents design of ring–shaped wide-band band pass filter with notched band. The ring –shaped UWB BPF using a simplified composite right/left handed (SCRLH) resonator. The narrow band notch responses produced by DMS (Defected trip Micros Structure) was introduced at a frequency of 5.2 GHz in order to reject any undesired signals which ma...

The multicarrier modulation of orthogonal frequency division multiplexing (OFDM) is one of the best choices, which has lead to achieve significant advancement for high data rate transmission in wireless communication systems. However, OFDM suffer from some obstacles during data transmission, the main one is the high peak-to-average power ratio (PAP...

In this chapter, a detailed study of the one-dimension electromagnetic band gap (1D-EBG) structures and their application in a directional antenna design are presented. To improve the ability and analyze and understand the behavior of 1D-EBG, three techniques of analysis are developed. The results show that the periodicity of the dielectric permitt...

In Morocco, Law 58/2015 has legalized the connection of photovoltaic systems on the low-voltage grid and the country should probably be adopting the net-metering approach. Since the electricity distributor should only buy a small part of the electricity injected, system over-sizing becomes critical for the investor. In these conditions, it is criti...

In this paper, the bandwidth enhancement of bandpass filter (BPF) is proposed by utilizing defected microstrip structure (DMS). The initial micro strip BPF which is designed to have the bandwidth 1GHz with the center frequency of 3.5GHz is deployed on FR4 Epoxy dielectric substrate with overall size and thickness of 14mm x 24mm and 1.6mm, respectiv...

p>In this paper, the bandwidth enhancement of bandpass filter (BPF) is proposed by utilizing defected microstrip structure (DMS). The initial micro strip BPF which is designed to have the bandwidth 1GHz with the center frequency of 3.5GHz is deployed on FR4 Epoxy dielectric substrate with overall size and thickness of 14mm x 24mm and 1.6mm, respect...

One of the biggest disadvantages of RFID systems is its low radio tag efficiency due to collisions. When several tags try to transfer data to the reader simultaneously, one is in the case of a multiple access. Time should be split between tags which In most proposed anti-collision algorithms, tags reply randomly to time slots chosen by the reader;...

This paper presents performances analysis and comparison of the conventional and intelligent maximum power point tracking (MPPT) strategies based on the Hill climbing searching method. The conventional HCS is a non-linear, dynamic and modeless MPPT strategy. Its principle is based on perturbing the rotor speed and observing its results on output po...

The transceiver combination technology, of orthogonal frequency division multiplexing (OFDM) with multiple-input multiple-output (MIMO), provides a viable alternative to enhance the quality of service and simultaneously to achieve high spectral efficiency and data rate for wireless mobile communication systems. However, the high peak-to-average pow...

At present, industrial growth and its environmental impact show that solar energy for solar thermal power plants is the fastest-growing environment-friendly form of energy sources for covering a variety of energy needs. The most common solar power plants available on the market use parabolic trough collectors (PTCs). For this, our study will target...

This paper consists of a theoretical study based on the conversion of solar energy into thermal energy using the parabolic trough collector. Our main objective is to study the performance of this collector in the region of the North-West of Morocco. The methodology is based on the resolution of heat exchange equations by a numerical simulation usin...

The technology is growing very rapidly, and the micro scale devices are playing a very important role in the electronic, mechanical and other application areas due to their integrability with CMOS IC technology, low power consumption, low cost fabrication and large frequency-Quality factor product. As there is a much demand for small and portable d...

In this paper, an electromagnetic band gap (EBG) resonator antenna with multi-sources excitation is proposed. The objective is to broaden the radiation bandwidth and the directivity of the EBG antenna. The directivity is increased by 13dB using EBG resonator compared to the conventional patch antenna case; a value of 20dB is obtained. The multi-sou...

In this paper, a new patch array antenna operating at three bands frequencies at 25GHz, 28GHz and 38GHz for the upcoming fifth generation (5G) cellular communication is presented. And it is specially designed to improve the gain with a good radiation behavior. The proposed array antenna comprises two patch antennas fed by a 1-to-2 Wilkinson power d...

In this paper, a novel compact band pass filter (BPF) is proposed for Wireless Local Area Network (WLAN) (2.2GHz - 2.6GHz) Application. The proposed BPF configuration is composed of a low pass filter (LPF). The transformation is due to the introduction of DMS structures (Defected trip Micros Structure) on the two micro strip lines. The lumped equiv...

The present paper is an evaluation of two grid-connected photovoltaic (PV) systems, the first combined system installed on the roof of Tetouan's faculty with a rate power of 5.4 kWp, and the second system located in the roof of a commercial building in Tangier with a rate power of 5 kWp. This study demonstrates that the efficiency of the three main...

In the last decade a combination of multiple-input multiple-output (MIMO) with orthogonal frequency division multiplexing (OFDM) has lead to significant advancement in wireless communication systems. It has been receiving a great deal of attention as a solution of high-quality service for next generation. However, one of the main disadvantages of O...

Satellite imagery is one of the wide areas in segmentation. They are used for Analysis of the different elements of the landscapes such as cropland, bare land, forests, flooded areas, assists in vegetation, disease detection, facilitates monitoring of deforestation and desertification, as well as the evolution of infrastructure in inhabited areas o...

Single-junction solar cells are the most available in the market and the most simple in terms of the realization and fabrication comparing to the other solar devices. However, these single-junction solar cells need more development and optimization for higher conversion efficiency. In addition to the doping densities and compromises between differe...

The combination of Multiple Input Multiple Output (MIMO) system with Orthogonal Frequency Division Multiplexing (OFDM) technology provides a powerful choice to increase channel capacity and improves the quality of service of wireless mobile communication. However, MIMO-OFDM systems are prone to high Peak-to-Average Power Ratio (PAPR). Which leading...

A new compact multiband PIFA (Planar Inverted-F Antenna) for mobile handset is proposed in this article. The proposed PIFA has a simple geometry with four slots integrated in the radiating patch and ground plane. The PIFA occupies a small volume of 51 × 14 × 7.2 mm ³ and is placed on the top portion of mobile phone. The optimized PIFA is worked in...

A combination of multiple-input multiple-output (MIMO) with orthogonal frequency division multiplexing (OFDM) has been receiving a great deal of attention as a solution of high-quality service for next generation wireless communications. However, one of the main disadvantages of OFDM is, its high Peak-to-Average Power Ratio (PAPR) which seriously l...

Under the growth increasing of the renewable energy demand, especially the wind energy one, there is a great interest to the large-scale wind energy conversion system (WECS). Hence, an expectation of the different kinds of stresses exposed to the system structures is required. In this paper, the dynamic behavior of a direct driven wind turbine syst...

A compact planar inverted-F antenna (PIFA) dual band two-unit multiple-input multiple-output (MIMO) antenna system withhigh isolation is developed. The proposed MIMO antenna that consists of two PIFA elements has the advantage of compactstructure and multi-band for mobile device. The proposed antenna can cover the frequency range from 2.36GHz to 2....

Developing and employing methods to reduce the mutual coupling between elements of an antenna array has become a hot topic in the design of antenna arrays. The utilization of electromagnetic band-gap (EBG) structures is an attractive way to reduce surface wave excitation in printed antenna geometries so to mitigate the mutual coupling problem. This...

The paper present an evaluation of a grid-connected photovoltaic (PV) system installed on the roof of a government building located in Tangier, Morocco. The experimental data was recorded from 1st January 2015 to December 2015 based on real time observation. The aim is to encourage the use of solar PV system for government, commercial and residence...

A compact Ultra Wideband (UWB) antenna with Worldwide Interoperability for Microwave Access (WiMAX) and Wireless Local Area Network (WLAN) with dual-band notched characteristics is presented in this article. The antenna design parameters have been optimized by the High Frequency Structural Simulator (HFSS) and CST Microwave Studio to be in contact...

One of the severe drawbacks of orthogonal fre-quency division multiplexing (OFDM) is high Peak-to-Average Power Ratio (PAPR) of transmitted OFDM signals. During modulation the sub-carriers are added together with same phase which increases the value of PAPR, leading to more interference and limits power efficiency of High Power Amplifier (HPA), it’...

In this article, a compact planar inverted-F antenna with a wide frequency band for WLAN, Bluetooth, HiperLAN, LTE2500, and WiMAX applications in mobile handsets is proposed. The designed PIFA provides two operating bands at 2.5 GHz with a bandwidth of 300 MHz (13%) and at 5.2 GHz with a bandwidth of 5700 MHz (76%). The dual-band performance and th...

In this paper, an optimization procedure for the design of pentagon Ultra Wide Band (UWB) antenna with wireless local area network (WLAN) Band notched is presented. The proposed antenna has the capability of operating between 3 GHz to 13 GHz. The antenna parameter design has been verified by the High Frequency Structural Simulator (HFSS) and the co...

Le gonflement des sols argileux est un phénomène très complexe et fortement influencé par les propriétés chimiques, minéralogiques et hydriques. Ce phénomène provoque l'instabilité des fondations construites sur ce type de sols, en provoquant par la suite leur détérioration. La modélisation permet une meilleure compréhension du comportement hydromé...

In this study, we'll present a new method to measure the permeability of clay soils (or infiltration rate) by laser interferometry. The device is a modified Michelson interferometer. Indeed on the movable mirror is glued a clay sample in the form of a parallelepiped, dried, of length L, height H and shaped to retain the drops of water on its surfac...

The article presents the new design of printed ultra-wideband (UWB) applications with WLAN band-notched characteristic based on electromagnetic band gap (EBG). In fact, the proposed antenna consists of a star polygon metal patch, a 50Ω microstrip feed line and a defective ground plane. In order to produce band rejection, the microstrip feed line is...

The properties of materials electromagnetic band-gap (EBG) and their advantage are being studied; then a high gain ultra-wideband (UWB) microstrip antenna using electromagnetic band-gap (EBG) structures concepts has been specifically designed in this paper. The-10 dB impedance bandwidth of the proposed antenna is 2.9–11.7 GHz about 251% broader, wh...