Abdelhalim abdelnaby Zekry

Ain Shams University · Department of Electronics and Electrical Communication Engineering

Multi-junction solar cells exhibit superior power conversion efficiency (PCE) in comparison with their single-junction counterparts. The tunable bandgap, low-cost, elevated short circuit current density (J sc), and open-circuit voltage (V oc) of perovskite solar cells (PSCs) have led to their widespread adoption as top sub-cells in tandem devices....

With the aim of achieving high efficiency, cost-effectiveness, and reliability of solar cells, several technologies have been studied. Recently, emerging materials have appeared to replace Si-based cells, seeking economic fabrication of solar cells. Thin-film solar cells (TFSCs) are considered strong candidates for this mission, specifically perovs...

Most of the solar cells that dominate the market are single-junction solar cells. These solar cells use mainly silicon, and some of them use relatively new materials like copper, indium, gallium, selenide (CIGS) and perovskite. These materials show a good performance, but they have a limitation of performance and are also costly or unstable. The st...

Multi-junction (tandem) cell using MAPbI3-xClx and silicon as absorbers has been designed and simulated in this paper. The thickness of the silicon layer in the bottom cell is 2 μm allowing it to absorb the transmitted spectrum from the perovskite subcell as much as possible. The thickness of the MAPbI3-xClx layer is optimized using a proposed algo...

Tandem solar cells have a superb potential to push the power conversion efficiency (PCE) of photovoltaic technologies. They can be also more stable and economical. In this simulation work, an efficient perovskite solar cell (PSC) with Spiro-OMeTAD as a hole transport material (HTM) and with no electron transport material (ETM) to replace the tradit...

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This work aims at inspecting the device operation and performance of a novel flipped npn microstructure solar cell based on low-cost heavily doped silicon wafers. The flipped structure was designed to eliminate the shadowing effect as applied in the conventional silicon-based interdigitated back-contact cell (IBC). Due to the disappearance of the s...

Low density parity checking codes (LDPC) are one of the most important issues in coding theory at present. LDPC-code are a type of linear-block LDPC-codes. Channel coding might be considered as the finest conversant and most potent components of cellular communications systems, that was employed for transmitting errors corrections imposed by noise,...

This paper introduces QR-SIC detector to minimize the probability of error comparing to SDM system. Spatial-division-multiplexing (SDM) system is a multiple-inputs-multiple-outputs (MIMO) system used to increase data transmission rate in modern communication systems. The major disadvantage of SDM system is the interference between the received symb...

FMCW radars were used in numerous applications in the last three decades. One important application is the human movements detection behind walls. In this paper, an FMCW low-cost radar is proposed and implemented for human motion detection behind multiple walls. A radar system is designed to operate at L-band to afford a good penetration capability...

The primary purpose of recent research has been to achieve a higher power conversion efficiency (PCE) with stable characteristics, either through experimental studies or through modeling and simulation. In this study, a theoretical analysis of an efficient perovskite solar cell (PSC) with cuprous oxide (Cu2O) as the hole transport material (HTM) an...

A novel multi-band planar 2 × 2 array loop antenna, with a frequency ranging from 0.5–4.5 GHz for energy harvesting applications is presented. The proposed loop antenna consists of an external strip loop and an internal banana strip connected to the external strip loop. The loop antenna occupies a small size of 62 × 38 mm2, while the total area of...

A single layer microstrip diode rectifier circuit with a flexible thin film schottky diode is proposed. A compact half wave rectifier with a shunt-diode configuration is designed and implemented using off-shelf SMS-7630 low barrier Schottky diode tuned for a centre frequency of 10 GHz and fabricated one using 0.81 mm Rogers (RO4003c) substrate. The...

This paper presents a low-complexity peak-to-average power ratio (PAPR) reduction scheme for single-carrier frequency division multiple access (SC-FDMA) system that is based on all-pass filters (APFs). The basic idea of the APF scheme is that it allows a flat magnitude response with a non-linear phase response. This means that this type of filters...

This paper presents a reconfigurable high efficiency, high output voltage, and multiband class-F radio frequency (RF) voltage doubler and two stages voltage doubler rectifiers for energy harvesting applications using RO4003C substrate. The proposed voltage-doubler circuits are suitable for multi-band LTE, IoT, WSN, UHF ISM 900 MHz, GSM 900, energy...

A photovoltaic system is one of the major sources of renewable energy. The grid-connected inverter controllers play an important role in the conversion and transmission of solar energy. Therefore, they must be improved to meet the demands for grid interconnection. This article introduces the design and hardware implementation of the intelligent fuz...

Abstract Low-cost traditional prosthetic legs, available worldwide, can make walking and stairclimbing possible but still difficult. This article presents the hardware implementation of the surface electromyography (sEMG) powered prosthesis actuation (PPA) system using a learned neural network algorithm based on recurrent neural network (RNN), whic...

Cognitive radio (CR) has become an interesting research field that attracts researchers due to its increasing spectrum efficiency. Therefore, spectrum sensing (SS) is the essential function of cognitive radio systems. This paper presents an efficient SS model based on convolutional neural networks (CNNs). We use the spectrogram images of the receiv...

Lead-free perovskite materials have attracted noteworthy interest for photovoltaics as they are free from toxicity and instability issues encountered in lead-based perovskites. In this work, we report on a simulation study of a two-terminal monolithic all lead-free tandem solar cell. The (MASnI3) cell with 1.3 eV bandgap is used as a bottom cell an...

The I-V characteristics of InP/AlGaInP quantum dot laser diodes with different cavity lengths were measured at different temperatures (77–400K). From the forward bias I-V characteristics, the laser diode electrical parameters, as the ideality factor (n), the reverse saturation current (Js), and series resistance (Rs) were extracted. The values of t...

Massive Multiple Input Multiple Output (MIMO) is a key technique used in 5G mobile communication systems; it aims to efficiently increase the spectral efficiency of the communication systems. Massive MIMO is a MIMO system with a massive number of antennas in the base station, it uses its large number of antennas to efficiently transmit and receive...

This paper aims to detect the existence of partial shading conditions on the PV array and to estimate the vicinity of the global maximum power point for shaded PV modules based solely on the captured image of the PV modules. Detecting the existence of partial shading is based on comparing the average image pixel intensity for each PV module to find...

A compact, single-layer microstrip rectenna for dedicated far-field RF wireless power-harvesting applications is presented. The proposed rectenna circuit configurations including multiband triple L-Arms patch antenna with diamond slot ground are designed to resonate at 10, 13, 17, and 26 GHz with 10 dB impedance bandwidths of 0.67, 0.8, 2.45, and 4...

This paper combines the advantages of both VLC communication and RF communication for car-to-car applications to achieve a higher data rate, more range coverage, smaller delay, and smaller BER. In the proposed scheme, the VLC maximum communication distance is chosen as 100 m per-hop approximately, which can be extended through multi-hop up to the t...

Perovskite solar cells (PSCs) have drawn significant consideration as a competing solar cell technology because of the drastic advance in their power conversion efficiency (PCE) over the last two decades. The interfaces between the electron transport layer (ETL) and the absorber layer and between the absorber layer and the hole transport layer (HTL...

In this work, we report on the effect of substituting the active intrinsic i-layer on a conventional pin structure of lead-free perovskite solar cell (PSC) by a homo p-n junction, keeping the thickness of the active layer constant. It is expected that when the active i-layer is substituted by a p-n homo junction, one can increase the collection eff...

Surface Electromyography (sEMG) signals have a lot of biomedical applications and modern human-machine interactions. sEMG signals received from muscles that require advanced methods for detection, pre-processing, and classification. Current research technologies are focused, principally on deep neural network architectures that collect spatial data...

Silicon industry has a mature learning curve which is the driver for 90% share of the PV market. Yet, the cost/m 2 of the planar crystalline silicon solar cell is still high. To reduce the cost of silicon-based solar cells, heavily doped wafers can be used in a proposed npn microstructure in which photoexcited carries are vertically generated while...

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Today advances and improvements in solar cells have been caused to emerge cost-effective with high PCE solar cells. They are ideal candidates for commercial devices and applications especially power plants, satellites and so on. Progress in solar cells have helped in solving PV problems and opened the doors to future discoveries. This chapter addre...

Due to the growing demands of mobile communication system users, higher peak data bit rates of up to 1 Gbps are being sought. As a result, the Long-Term Evolution Advanced (LTE-Advanced) as an advanced standard for mobile communication systems was created by the Third Generation Partnership Project (3GPP). On the physical layer (PYH), the most rece...

In healthcare applications, the remote monitoring of moving patients depends on wearable nodes that should be mobile. Thus, wearable nodes should be power mains-disconnected most of the time to enable natural wandering of patients in the area. Thus, easy-to-use models are utilized in a seamless way. From this perspective, it becomes necessary to de...

When transmitting the data in digital communication, it is well desired that the transmitting data bits should be as minimal as possible, so many techniques are used to compress the data. In this paper, a Lempel-Ziv algorithm for data compression was implemented through VHDL coding. One of the most lossless data compression algorithms commonly used...

The increasing number of home appliances and the variation of technologies between them (modern or smart and legacy or old) is the reason for homes energy problem. In addition, increasing the peak load of grids facilities often causes electricity cuts of homes' sectors to reduce the overloads due to peak load. All of these reasons lead to use the e...

Detecting and analyzing a moving body position are helpful in many fields, such as medicine, sports performance, virtual reality and many more. Therefore, researchers try to develop a tool or a system that helps to detect the motion and tracking its position. This paper shows how a Si solar cell can be modified to function as a Position Sensitive D...

Nowadays, the popular 2.4‐GHz band is used in different systems, such as Wi‐Fi, Bluetooth, wireless sensor systems, and wireless cameras. Instead of the over‐crowded 2.4‐GHz Wi‐Fi band, this research offers the experience of using the 5‐GHz Wi‐Fi band, which provides more spectrum availability, more channels, larger bandwidth, faster data transmiss...

The book presents a comprehensive survey about advanced solar cell technologies. Focus is placed on semiconductor materials, solar cell efficiency, improvements in surface recombination velocity, charge density, high ultraviolet (UV) sensitivity, modeling of solar cells etc. The book references 281 original resources with their direct web links for...

This paper reported a pioneering 5G multiband microstrip line fed patch antenna for IoT, wireless power transfer (WPT) and data transmission. The proposed antenna is accomplished using a triple L-arms patch antenna responsible for the multiband response. A diamond-shaped ground slot is added to control and increase the bandwidth of the resonant fre...

Air-to-ground (A/G) communications have been transferred from the congested very high frequency (VHF) band to occupy the guard bands between adjacent distance measurement equipment (DME) navigation channels within the L-Band. However, the inlayed channels, called L-band digital aeronautical communication system (LDACS) channels, experience severe i...

This work proposes a dual-mode radio frequency (RF) power amplifier (PA) for the 4.8 GHz multi-standard applications using a 130 nm CMOS technology. The proposed RF power amplifier (PA) consists of two stages (driver and power). By changing the driver and the power stages bias voltages any mode of PA (class-AB\F) can be achieved. The class-AB or li...

In this paper, a reconfigurable multi-mode Class-AB/F power amplifier (PA) is proposed for 0.1–4.2 GHz multistandard applications. The PA operates in linear mode (class-AB) for variable-envelope modulated signals and switching mode (class-F) for constant-envelope modulated signals. The proposed linear mode PA design is suitable for multi-band LTE,...

This paper aims to present a detailed systematic approach to identify the main design parameters of PIN power diodes. Firstly, the diode physical parameters are initialized using simple analytical equations. The second phase is the optimization of the diode parameters considering PSPICE circuit simulation where an electro-thermal physically based c...

Confidentiality and Integrity algorithms are based on SNOWand ZUC stream cipher algorithms. These standardized algorithms are designed by the 3rd Generation Partnership Project (3GPP) for advanced mobile communication systems (4G-LTE Advanced, LTE Advanced Pro, and 5G-Next Generation). In this paper, twenty configurations of SNOW and ZUC algorithms...

In this paper, a wearable medical sensor system is designed for long-term healthcare applications. This system is used for monitoring temperature, heartbeat, blood oxygen saturation (SpO 2), and the acceleration of a human body in real-time. This system consists of a temperature sensor, a pulse oximeter sensor, an accelerometer sensor, a microcontr...

This paper presents high efficiency, high integration, and wideband low-IF radio frequency transceiver for multi-standard applications using 130 nm CMOS technology. The proposed low-IF transceiver includes receiver, transmitter, and quadrature voltage-controlled power oscillator (QVCO). The proposed receiver consists of a low-noise driver stage des...

Recently, there is a rapid trend to incorporate low cost solar cells in photovoltaic technology. In this regard, low-cost high-doped Silicon wafers are beneficial; however, the high doping effects encountered in these wafers render their practical use in fabrication. The npn solar cell microstructure has been found to avoid this issue by the proper...

When transmitting the data in digital communication, it is well desired that the transmitting data bits should be as minimal as possible, so many techniques are used to compress the data. In this paper, a Lempel-Ziv algorithm for data compression was implemented through VHDL coding. The Lempel-Ziv algorithm is one of the most widely used among loss...

The recent global status reports of Renewable Energy Source (RES) show that, wind and solar energy have the highest growth rate and installation capacities among all other renewable sources. In addition, reviewing the recent related researches proves that, combining two or more renewable energy sources in hybrid topology can increase the total syst...

Wind energy has the fastest and highest growth rate of any other Renewable energy sources (RES). Investigating the Wind Energy Conversion Systems (WECS) is very important for improving efficiency. However, It is required a monumental accessible land space for installing Wind turbines(WT). Consequently, this paper presents the design and implementat...

Wind energy has the fastest and highest growth rate of any other Renewable energy sources (RES). Investigating the Wind Energy Conversion Systems (WECS) is very important for improving efficiency. However, It is required a monumental accessible land space for installing Wind turbines(WT). Consequently, this paper presents the design and implementat...

Without question combining two or more renewable energy sources (RES) in hybrid topology can increase the overall system reliability and efficiency especially if they have a complementary nature. However, most RES has an intermittent nature of energy production due to dependency on weather conditions. Therefore, there are big challenges for coordin...

this paper introduces a complete design of a fuzzy controller for MPPT in PV systems. The proposed controller is simulated in Simulink to prove the superior performance of the proposed fuzzy controller over the traditional perturb and observe algorithm. The simulation results show that the fuzzy controller has faster response and higher efficiency...

In this paper, a self-powered Internet of Things (IoT) wearable sensor node is proposed for healthcare monitoring. This node enables doctors of measuring the heart rate, blood oxygen saturation (SpO2), and body temperature. This node is based on NodeMCU board that includes a microcontroller with a Wi-Fi chip. A solar energy harvester is developed a...

For a long time researchers try to develop tools or systems that could help in detecting the motion of the moving body and tracking it. It had a big importance in many fields such as sport performance, medical, virtual reality and many more fields. This paper proves that a solar cell can be modified to function as a Position Sensitive Detector (PSD...