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All Journal International Journal of Electrical and Computer Engineering TELKOMNIKA (Telecommunication Computing Electronics and Control) Bulletin of Electrical Engineering and Informatics Indonesian Journal of Electrical Engineering and Computer Science
Z. Zakaria
Universiti Teknikal Malaysia Melaka
Computer Science & IT Electrical & Electronics Engineering

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Journal : TELKOMNIKA (Telecommunication Computing Electronics and Control)

 1 
Smartphone’s off grid communication network by using Arduino microcontroller and microstrip antenna Yaqdhan Mahmood Hussain; H. O. Hanoosh; Z. Zakaria; Fahad Taha Al-Dhief; Murtaja Ali Saare; Mustafa Muhammad Jawad; Alaa Hamza Omran; Ali Abdulateef Abdulbari
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 19, No 4: August 2021
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v19i4.15949

Abstract

After a major disaster, the present communication system fails in providing the services in the affected area. No means of communication proves to be more dangerous as the rescue and relief operations become more difficult. Our current research is about establishing a network in such a disaster-prone area, which would facilitate to communicate and carry out the rescue missions. This research project used Java to create a fire-chat application and used it with the smartphone android system. It used Bluetooth model HC-05 linked with Arduino UNO by the SPI interface to connect Arduino with the smartphone. The FR-model HCW69 connected with Arduino by using UART to transceiver the message. The microstrip antenna 915 MHz connected with the FR-model HCW69 to give us more distance. The maximum effective range of the transceiver was 1 kilometer, to communicate by forming a mesh network. This application is helpful in the case when the smartphone is out of service; it (smartphone) can be communicated connected to the other nearby users with a message.
Radiation beam scanning for leaky wave antenna by using slots Jamal S. Kasim; M.S. M. Isa; Z. Zakaria; M. I. Hussein; Mowafak K. Mohsen
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 3: June 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v18i3.15720

Abstract

This paper provides an insight of a new, microstrip leaky wave antenna. It holds the ability to continue steer its beam at a swapping frequency. This is done with acceptable impedance matching while scanning and very little gain variation. Investigation is carried out on LWAs’ control radiation pattern in steps at a band frequency via vertical and horizontal slots. The enhancement is realized by etching horizontal and vertical slots on the radiation element. This study also presents a novel half-width microstrip leaky wave antenna (LWA). The antenna is made up of the following basic structures group’s vertical and horizontal slots. The reactance profile at the microstrip’s free edge and thus the main beam direction is changed once the control-cell states are changed. The radiation pattern direction changes by sweeping the operating frequency between 4 GHz to 6 GHz.The main beam may be directed by the antenna between 15o and 55o. C band achieved the measured peak gain of the antenna of 10 dBi at 4.3 GHz beam scanning range.
Optical Fiber Bending Detection on Long Distance OPGW using OTDR M. F. M. Salleh; Z. Zakaria
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 13, No 3: September 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v13i3.1726

Abstract

In Malaysia, thousands of kilometers of Optical Ground Wire (OPGW) have been installed by a utility company. For long distance fiber cable, there is a possibility of optical fiber to bend with very small radius especially in joint closures which caused optical power to attenuate. This attenuation is known as ‘bend losses. Bend loss increases the total power attenuation of optical fiber. In addition, for long distance fiber cable, it is important to avoid any extra loss as the fiber itself attenuates 0.2 to 0.35 dB/km and splice loss about 0.1 dB each. Hence, in this study, the method of detecting bend loss as well as optical fiber bending is presented. The result of this study is expected to allow fiber industry players to determine the exact location and proper rectification can be done to solve bend loss problem.
Peripheral interface controller-based maximum power point tracking algorithm for photovoltaic DC to DC boost controller Z. A. Ghani; E. Onn; M. Y. Zeain; Apriana Toding; F. A. Azidin; H. Othman; Z. Zakaria; H. S. Lago
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 1: February 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v18i1.12730

Abstract

A method of developing a maximum power point tracking (MPPT) algorithm for photovoltaic (PV) utilizing a peripheral interface controller (PIC) is presented in this paper. The efficiency and adequacy of a PV depend on the temperature and the exposed position to the sun. Thus, there is an optimum point at which the operating power is at maximum. The goal is to operate the PV module at this point (MPP). It can be accomplished by using the MPPT algorithm designed with a DC-DC boost converter. The boost converter, MPPT circuit, PIC18F4550 microcontroller and PV panel are the main components used in this design. The current and voltage produced by the solar panel are observed continuously by a closed-loop control system. The microcontroller-based control system adjusts the duty cycle of the converter to extract the maximum power. With a DC input voltage of 15 V, the boost converter is capable of generating an output voltage of an approximately 60 Vdc at a maximum power of 213.42 W with minimum voltage ripple as compared to 84 W without the MPPT. It proved the effectiveness of the developed algorithm.
Co-Authors A. M. S. Zobilah A. Othman A. Toding A.A. Zulkefle A.A.M. Isa A.I.A. Rahman Ahmed Jamal Abdullah Al-Gburi Alaa Hamza Omran Ali Abdulateef Abdulbari Apriana Toding B. H. Ahmad E. Onn F. A. Azidin Fahad Taha Al-Dhief H. O. Hanoosh H. Othman H. S. Lago I. D. Saiful Bahri Jamal S. Kasim M. Abu M. F. M. Salleh M. I. Hussein M. K. Abdulhameed M. Y. Algumaei M. Y. Zeain M. Zainon M.A.M. Hanafiah M.B. Farriz M.S. M. Isa M.S.M. Isa Mohammed Yousif Zeain Mothana L. Attiah Mowafak K. Mohsen Mowafak khadom Mohsen Murtaja Ali Saare Mustafa Muhammad Jawad N. A. Shairi N. Edward N. Saleh N.F. Johan R. Syahputri S.A.A. Shukor Sriyanto Sriyanto Tole Sutikno Yaqdhan Mahmood Hussain Z. A. Ghani Z.A. Baharudin