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JournalISSN: 2332-3280

Universal Journal of Electrical and Electronic Engineering 

Horizon Research Publishing Co., Ltd.
About: Universal Journal of Electrical and Electronic Engineering is an academic journal published by Horizon Research Publishing Co., Ltd.. The journal publishes majorly in the area(s): Voltage & Power (physics). It has an ISSN identifier of 2332-3280. Over the lifetime, 202 publications have been published receiving 533 citations.

Papers published on a yearly basis

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Journal ArticleDOI
TL;DR: The activation mechanisms of reconfigurable antennas, and their design and operation optimization are discussed, and the applications of reconfigured antennas in cognitive radio, multi-input multi-output (MIMO) systems, satellite communications, and biomedical devices are highlighted.
Abstract: Reconfigurable antennas are capable of dynamically altering their frequency, polarization, and radiation properties in a controlled and reversible manner. They modify their geometry and behaviour to maximize the antenna performance in response to changes in their surrounding conditions. To implement a dynamical response, they employ different mechanisms such as PIN diodes, varactors, radio-frequency microelectromechanical systems (RF-MEMS), field effect transistors (FETs), parasitic pixel layers, photoconductive elements, mechanical actuators, metamaterials, ferrites, and liquid crystals. These mechanisms enable intentional distribution of current on the antenna surface producing reversible modification of their properties. This paper presents the design process and applications of reconfigurable antennas. The activation mechanisms of reconfigurable antennas, and their design and operation optimization are discussed. The latest advances on reconfigurable metamaterial engineering, and the current trends and future directions relating to reconfigurable antennas are reviewed. Finally, the applications of reconfigurable antennas in cognitive radio, multi-input multi-output (MIMO) systems, satellite communications, and biomedical devices are highlighted.

24 citations

Journal ArticleDOI
TL;DR: In this article, the design of a co-axial fed single layer microstrip patch antenna (MSA) for 5.2 GHz WLAN application is presented, and the impedance matching and the radiation characteristics of this proposed structure are studied and analyzed using Computer Simulation Technology (CST) Microwave Studio, which is a commercially available electromagnetic simulator based on the method of finite difference time domain technique to achieve the desired specification.
Abstract: In this paper, the design of a co-axial fed single layer microstrip patch antenna (MSA) for 5.2 GHz WLAN application is presented. The impedance matching and the radiation characteristics of this proposed structure are studied and analyzed using Computer Simulation Technology (CST) Microwave Studio, which is a commercially available electromagnetic simulator based on the method of finite difference time domain technique to achieve the desired specification. The proposed antenna based on co-axial feed configuration has the maximum achievable bandwidth obtained about 219.2 MHz (5.14-5.36 GHz) at -10 dB reflection coefficient which corresponds to WLAN 5.2 GHz frequency band and the maximum achievable gain is 5.208 dB. Stable radiation characteristics are obtained across the frequency band.

21 citations

Journal ArticleDOI
TL;DR: In this article, the authors present the modeling and performance analysis of a standalone wind system in MATLAB/SIMULINK environment, which is useful to model, simulate and study the effect of change in wind speed of a wind system.
Abstract: The paper presents the modeling and performance analysis of a standalone wind system in MATLAB/SIMULINK environment. Stand-alone systems using renewable energy sources, such as wind energy with storage battery banks are commonly used to supply remote houses. The model of wind turbine is developed using basic circuit equations governing the operation of the wind turbine. Permanent Magnet Synchronous Generator (PMSG), which is based on variable-speed operation, has been used in this paper. Since the speed of wind turbine is variable, the generator is controlled by power electronic devices. A rectifier is used to rectify the output voltage of PMSG and DC/DC buck converter is used to decrease this rectified voltage to that of battery and connected DC load. The buck converter is controlled to extract the maximum power output of wind system. Firstly the mathematical modeling of a wind turbine is done and its different characteristics have been obtained for different parameters. Secondly a standalone model of wind system is modeled and analyzed. This paper is useful to model, simulate and study the effect of change in wind speed of a standalone wind system.

18 citations

Journal ArticleDOI
TL;DR: In this paper, a performance analysis of Free Space Optics (FSO) and Single Mode Fiber is carried out based on the Quality Factor and Bit Error Rate (BER) of a signal that was carried out using optical system simulations with a wavelength of 1310 nm, 1380 nm, 1550 nm,1550 nm and 1560 nm, with 1 km, 3 km and 5 km, respectively.
Abstract: Developments in the technology sector are currently experiencing rapid progress, especially in data transmission technology. The increasing need for fast data traffic in the telecommunications sector requires technology that can send data quickly. Optical fiber has the speed of receiving and sending data at 2.5 Gbps while FSO has a speed of up to 100 Gbps but this depends on Wavelength, the modulation technique used and the distance of the telescope between the transmitter and receiver. The speed of receiving and sending data also depends on the Quality (Q) of the signal, the greater the value of Quality (Q) of the signal, the better the Quality of the signal. FSO is an optical communication system that uses the atmosphere as its propagation medium and Optical Fiber uses silica as its propagation medium. Therefore, in this paper, a performance analysis of Free Space Optics (FSO) and Single Mode Fiber is carried out based on the Quality Factor and Bit Error Rate (BER) of a signal that is carried out using Optical System simulations with a wavelength of 1310 nm, 1380 nm, 1550 nm, 1550 nm and 1560 nm, with 1 km, 3 km and 5 km, respectively. Then, analysis uses an Eye Diagram to analyze the output signal and compare the Factor Q and Bit Rate Error (BER).

17 citations

Journal ArticleDOI
TL;DR: The findings revealed that the accuracy of Haar Cascade classifier to detect the eyes and faces was subjected to correct sitting position as well as the eyes must not be covered with glasses or shades, and the range of average EAR value detected by the system was between 0.141 and 0.339.
Abstract: Driver’s drowsiness is one of the leading contributing factors to the increasing accidents statistics in Malaysia. Therefore, the design and development of driver drowsiness detection based on image processing using Raspberry Pi camera module sensor interfacing with Raspberry Pi 3 board are proposed in this paper. To achieve the aim of the research, the Haar Cascade Classifier algorithm is implemented for eyes and face detection whereas for eyes blink (open and close) detection, the Eye Aspect Ratio (EAR) algorithm is employed. From several experiments conducted on six recruited subjects, the findings revealed that the accuracy of Haar Cascade classifier to detect the eyes and faces was subjected to correct sitting position (head must facing to the camera) as well as the eyes must not be covered with glasses or shades. Meanwhile, the range of average EAR value detected by the system was between 0.141 (eyes closed) and 0.339 (eyes opened). In conclusion, the image processing-based Haar Cascade and EAR algorithms utilized on Raspberry Pi platform have been successfully executed. For future improvement, the current board can be replaced with Raspberry Pi Touch Screen to minimize the hardware setup and the physiological based analysis using alcohol and heart rate sensors can be added.

13 citations

Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
20232
20221
20213
202022
201966
20177