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Bending and crumpling deformation study of the resonant characteristic and SAR for a 2.4 GHZ textile antenna

Elias, Norfatin Akma and Samsuri, Noor Asmawati and Abdul Rahim, Mohamad Kamal and Panagamuwa, Chinthana J. and Whittow, William George (2015) Bending and crumpling deformation study of the resonant characteristic and SAR for a 2.4 GHZ textile antenna. Jurnal Teknologi, 77 (10). pp. 17-23. ISSN 0127-9696

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Official URL: http://www.jurnalteknologi.utm.my/index.php/jurnal...

Abstract

Nowadays, most rural and hilly areas use the small and microscale plants to produce electricity; it is cheap, available and effective. Utilizing hydrokinetic turbines in flow of rivers, canal or channel to produce power has been a topic of considerable interest to researchers for past years. Many countries that are surrounded by irrigation or rainy channels have a great potential for developing this technology. Development of open flow microchannels that suit these countries has a main problem, which is low velocity of current appears, hence deploying nozzle in-stream open channels flow is the brilliant method for increasing the channels current flow systems’ efficiency. The nozzle is believed to have an ability of concentrating the flow direction whilst increasing the flow velocity. In this study, the effects of nozzle geometrical parameters such as diameter ratio, nozzle configuration and nozzle edges shape on the characteristics of the flow in the microscale rectangular channels have been investigated numerically, using a finite volume RANSE code ANSYS CFX. The physical parameters were reported for a range of diameter ratio (d2/d1) from 5/6 to 1/6 and nozzle length (Ln) of 0.8 m for various nozzle shapes. We also proposed a new approach which is the use of NACA 0025 aerofoils as a deploying nozzle in channels. The results of the current study showed that, although the decrease in the nozzle diameter ratio led to an increase of the flow velocity through the channel but it can affect drastically on the flow pattern, especially the free surface, at the nozzle area, which may reduce the amount of the generated power, thus the study concluded with optimum diameter ratio, which was 2/3. The flow patterns improved with the curved edges shape; theOver recent years, there has been an explosive growth of interest in the development of flexible wearable antennas due to rapid growth in Wireless Body Area Network (WBAN) applications. However, the antenna is subjected to deformation when being worn by users. Therefore, it is compulsory to analyze the absorption of electromagnetic (EM) radiation and the antenna performances as a function of the deformation conditions since the antenna is not in its normal flat conditions anymore. In this paper, two types of deformations; bending and crumpling are analyzed by means of CST Microwave Studio. The peak SAR10g demonstrates increment up to 65.7% and 48.7% under bending and crumpling deformation respectively. Moreover, the crumpling is more sensitive to the geometrical shape and composition of the exposed body area if compared to bending. Moreover, the detuning effects of the resonant frequency are more significant for crumpling cases. NACA shape gave the most preferable results.

Item Type:Article
Uncontrolled Keywords:dipole antennas, electromagnetic fields, electromagnetic radiation, electromagnetic wave absorption
Subjects:A General Works
ID Code:57949
Deposited By: Haliza Zainal
Deposited On:04 Dec 2016 12:07
Last Modified:01 Nov 2017 12:17

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