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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...
This paper presents a new exact series for modal Green's function that arises when solving the problems of electromagnetic scattering from bodies of revolution. The accuracy and computation time of the series are compared with results from numerical integration. The results using the series are in excellent agreement with those from integration. Moreover, results show that the computation time using...
A technique that is based on spherical wave functions expansion for the free space Green's function is used to derive exact near and far electromagnetic fields expressions for traveling wave circular loop antennas (TW-CLAs) with arbitrary phase change. These expressions describe separately electromagnetic fields inside and outside a sphere that generated when the loop revolves about its diameter....
In this paper an exact electromagnetic near-fields expressions for an array of circular loop antennas (CLA) are presented. The technique is based on the spherical wave functions expansion for the free space Green's function. Fields of the uniform current CLAs array and that on the axis of the array, as well as the fields of the so called gate antenna arrangement, are obtained from the general expressions...
Sand and Dust storms have the potentiality of causing microwave degradation for substantial percentage of time which can lead to drop in the availability and quality of services rendered by communication systems. This paper investigates induced cross-polarization by dust storms at MMW bands. It introduces a model factor to calculate phase shift and attenuation which are to be used as inputs to cross-polarization...
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