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All Journal Buletin Ilmiah Sarjana Teknik Elektro Indonesian Journal of Electrical Engineering and Computer Science
Yousif Azzawi Hachim
Tikrit University
Electrical & Electronics Engineering

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Design of a miniaturized wideband disc monopole antenna used in RFID systems Sufyan Hazzaa Ali; Ahmed Hameed Reja; Yousif Azzawi Hachim
Indonesian Journal of Electrical Engineering and Computer Science Vol 21, No 2: February 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v21.i2.pp994-1004

Abstract

Radio-frequency identification (RFID) is an important wireless technology which utilizes radio frequencies (RFs) for exchanging data between two or more points (tags and readers), that represent an automatic identification (Auto-ID) system. This paper introduces an omnidirectional microstrip antenna operates at 2.45 GHz used for a radio-frequency identification (RFID) technology. The length of the proposed antenna is 36.5 mm and the width is 27 mm. The substrate material which has been used as a base of antenna is FR4 that has dielectric constant value of 4.3 and dielectric thickness value of 1.6 mm. Regarding the resonance frequency, return loss of the proposed antenna design is -34.8 dB. A promising directivity outcome of 2.8 dB has been achieved with omnidirectional radiation pattern as well as an acceptable efficiency of 66%. The proposed antenna design accomplishes a wideband frequency of 1.21 GHz in the frequency range of (2.14  3.35) GHz. The computer simulation technology (CST) microwave studio software has been used for implementing the proposed antenna design. The antenna design fabricatation and its characteristics have been measured using vector network analyzer (type MS4642A). The obtained results of the experimental design achieve a little bit differences as compared with the simulation results
Fuzzy Logic-Based Distributed and Centralized MPPT Architectures for Photovoltaic Systems: A Comparative Study under Dynamic Irradiance and Partial Shading Conditions Waleed Mahmood Abdullah Al-Darraji; Waladdin Mezher Shaher; Yousif Azzawi Hachim; Abdulbari Talib Naser
Buletin Ilmiah Sarjana Teknik Elektro Vol. 8 No. 5 (2026): October
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/biste.v8i5.16356

Abstract

Maximum Power Point Tracking (MPPT) is very important to enhance the energy harvesting capability of photovoltaic (PV) systems under various environmental conditions. But, under dynamic irradiance and partial shading conditions, conventional MPPT architectures may be plagued by poor tracking performance and energy extraction. This study investigates the use of a fuzzy logic controller (FLC) for MPPT and evaluates its performance in both Centralized Maximum Power Point Tracking (CMPPT) and Distributed Maximum Power Point Tracking (DMPPT) architectures. The key outcome of the present study is the comparison of FLC based CMPPT and DMPPT configurations under dynamic irradiance. MATLAB/Simulink based models are established to evaluate the performance measurement with irradiance profiles of 500-1000 W/m2. The assessment included tracking efficiency, convergence behavior, steady state oscillations and recuperating energy capability under various operating scenarios. The simulation results demonstrate that the proposed FLC exhibits a faster response to changes and better tracking capability compared to the baseline MPPT methods considered in this study. The controller achieved tracking performance up to 97% and reduced stable-state oscillations by above 60%. The DMPPT configuration with fuzzy logic control harvested significantly greater amounts of energy than the respective CMPPT configuration under partial shading conditions. The results show that the use of fuzzy logic control with distributed MPPT architectures can improve the robustness and energy harvesting in irregular irradiance conditions, and therefore, this method can be applied to modern photovoltaic systems.
Co-Authors Abdulbari Talib Naser Ahmed Hameed Reja Sufyan Hazzaa Ali Waladdin Mezher Shaher Waleed Mahmood Abdullah Al-Darraji