The high-frequency performance of the reflector antennas is mainly limited by the surface. It has been shown that distortions on different regions of the reflector surface can have different effects on the radiation performance. In other words, degradation of the radiation pattern due to the presence of surface distortions is sensitive to the location and behavior of the surface distortion prof...

An axially corrugated horn antenna with an elliptically shaped taper is proposed for satellite communication applications. This structure is a good candidate for the feed of reflectors and also for improving the electrical properties of reflector antennas. A tapering method is used to justify the horizontal location of the corrugation profile which improves the electrical performance of the pre...

The dual polarized reflector antenna used for satellite communications consists of two reflectors; one reflector is solid, the other consists of metal grid. The structure is complicated and the bandwidth is narrow. This antenna structure can be simplified by removing the metal grid and using the solid reflector together with a thin electromagnetic band gap material pasted to the surface of the ...

Studies conducted by the Cambridge Radio Observatory Committee during the past two years show that a large steerable telescope can be constructed at lower cost and with higher precision if the antenna is protected from the environment by a radome. These studies also indicate that the extremely high pointing precision (10 arc-sec) needed to make effective use of a large aperture at wavelengths a...

This paper introduces a Design of dual reflector Cassegrain feed system antenna with suitable design aspects like smaller reflector and sub reflector diameter for higher sub reflector efficiency, lower Cassegrain blockage losses and desired illumination taper. Design parameters are computed from the simple and explicit analytical formulas. Design example is represented to differentiate the effi...

The submillimeter antennas of the Atacama Large Millimeter Array (ALMA) have specifications that are beyond the current state of the art in accurate reflector antenna technology. Considering that as many as 64 of these antennas would eventually be needed, the ALMA partners AUI/NRAO and ESO each agreed to acquire a prototype antenna, and subject these to an extensive evaluation program. In this ...

This paper presents the shaped reflector antenna by using backscattering technique to achieve the completely broad-beam radiation pattern. The radiation synthesis method for shaped reflector that has to illuminate a predefined circular area are presented by using a variety of discretization of elementary geometrical functions such as, triangular, quadratic, circular, guassian, cosine, squared c...

In this paper, an antenna array structure consisting of a reflector plate and a number of printed dipole radiation elements is investigated. This antenna array implementation is suitable for the globally available 2.4GHz and 5GHz ISM frequency band facilitating a variety of wireless applications. S-parameters and radiation characteristics are simulated and measured in details. The impact of the...

The demands for broadband services by wireless communication systems are rapidly growing. An ultra wideband radio technology has become an important topic for microwave communication because of its low cost and low power consumption. The ultra wideband technology is specified the frequencies ranging from 3.1 GHz to 10.6 GHz by Federal Communication Commission (FCC), which has a bandwidth ratio ...