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Md. Rafiqul, Islam
International Islamic University Malaysia
Electrical & Electronics Engineering

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Analysis of Airborne Dust Effects on Terrestrial Microwave Propagation in Arid Area A.A Elsheikh, Elfaih; Md. Rafiqul, Islam; Hadi Habaebi, Mohamad; F. Ismail, Ahmad; E. O. Elshaikh, Z.; M. Suliman, F.; Chebil, Jalel
Bulletin of Electrical Engineering and Informatics Vol 8, No 3: September 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v8i3.1528

Abstract

Sand and dust storms are environmental phenomena ,during these storms optical visibility might be decreased, consequently, atmospheric attenuation is clearly noticed.  Micro-wave (MW) and Milimeter-wave (mm) propagation is severely affected by dust and sand storms in considerable areas around the world. Suspended dust particles may directly cause attenuation and cross polarization to the Electromagnetic waves propagating through the storm. In this paper, a thorough investigation of dust storm characteristics based on  measured optical visibility and relative humidity is presented. In addition,the dust storms effects of on Micro-wave and Millimeter-wave propagation have been studied based on data measured Received Signal levels (RSL)and dust storm characteristics synchronously. Analytical  dust  attenuation models predictions are matched to the measured attenuation data at 14 GHz and 21 GHz. It has been found that the measured attenuation is approximately ten times higher than the predicted attenuation for both frequencies.
Designing Large-Scale Antenna Array Using Sub-Array Mukit, Naimul; Md. Rafiqul, Islam; Zahirul Alam, AHM; Abdullah, Khaizuran; Farihah Abdul Malek, Norun; Nibir, Rauful; Hidayah M Adnan, Noor; Osman, Eid
Bulletin of Electrical Engineering and Informatics Vol 8, No 3: September 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v8i3.1529

Abstract

Antenna array of large scale have been examined for different applications including 5G technology. To get better data rate or a reliable link substantial number of antenna arrays have been utilized to provide high multiplexing gains as well as array gains with high directivity. In this paper a simple but efficient implementation technique of using sub-arrays for the improvement of large-sized uniform arrays. By repeating a small sub-array multiple times large arrays can be designed. This implication of utilizing small array simplifies the design of a larger array which allows the designer to concentrate on the smaller sub-array before assembling larger arrays. So, by investigating the sub arrays the performance and radiation characteristics of large arrays can be anticipated. The array-factor for a planar sub-array of 2x2 (4 elements) is analyzed using Mat-lab software and then a large array is formed by placing the 2x2 sub-array in  different configurations in a rectangular arrangements up to 8x8 planar array. And then the results are validated with CST (Computer simulation technology) simulation results. In this way the array-factors, directivities, HPBWs, and side lobes of the constructed large arrays are analyzed and associated with the small sub-array.
Co-Authors A.A Elsheikh, Elfaih Abdullah, Khaizuran Chebil, Jalel E. O. Elshaikh, Z. F. Ismail, Ahmad Farihah Abdul Malek, Norun Hadi Habaebi, Mohamad Hidayah M Adnan, Noor M. Suliman, F. Mukit, Naimul Nibir, Rauful Osman, Eid Zahirul Alam, AHM