Effects on the radiation pattern of a reflector antenna due to a dust accretion on its surface

Hamed, Sameir M. Ali and Musa, Abdulwaheed and Bashir, Saad Osman (2015) Effects on the radiation pattern of a reflector antenna due to a dust accretion on its surface. In: 2015 International Conference on Computing, Control, Networking, Electronics and Embedded Systems Engineering (ICCCNEE 2015), 7th-9th Dec. 2015, Khartoum, Sudan.

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Abstract

The performance of the reflector antenna may seriously degrades in terms of the gain reduction and beam shift when a dust/sand is accreted on its surface. This paper investigates the effects on the radiation pattern of a practical parabolic reflector antenna due to the dust accretion on its surface. A modified far-fields expressions for a parabolic reflector that is fed by a rectangular waveguide and partially covered with a uniform layer of dust are formulated. These modified field expressions are used to study the radiation pattern of a reflector antenna of 1 m in diameter which is fed by a rectangular waveguide of sides 0.95λ×0.70λ operating at X-band, assuming an acretion of a uniform layer of dust on the reflector. It is found that the reduction of the maximum signal level at a given frequency changes almost periodically with a period nearly equal to π as t increases, and the thick layers of dust does not necessarily result in more reduction in the signal level or beam phase shift compared to the thin layers. For t=6 mm, the worst signal reduction and phase shift in the main beam occur when the surface of the reflector is half-covered with dust, while the full-covered reflector results in a minimum signal reduction without any phase shift in the main beam.

Item Type:	Conference or Workshop Item (Plenary Papers)
Additional Information:	6501/51903
Uncontrolled Keywords:	Dust; Near-Fields; parabolic reflector antenna; radiation pattern
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA168 Systems engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Electrical and Computer Engineering
Depositing User:	Saad O Bashir
Date Deposited:	19 Sep 2016 16:01
Last Modified:	27 Dec 2016 10:52
URI:	http://irep.iium.edu.my/id/eprint/51903

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