Topic
Cassegrain antenna
About: Cassegrain antenna is a research topic. Over the lifetime, 3207 publications have been published within this topic receiving 28278 citations.
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Proceedings Article•
12 Apr 2010
TL;DR: In this article, a method to control the radiation pattern dynamically in accordance with the movement of the rain area assuming array-fed reflector antenna using 61 horns and a reflector with the aperture diameter of 2.2m was presented.
Abstract: Satellite broadcasting in the 21-GHz band is expected to transmit large-capacity signals. We have been studying rain fading mitigation techniques in order to compensate large amount of rain attenuation. In this paper, we show a method to control the radiation pattern dynamically in accordance with the movement of the rain area assuming array-fed reflector antenna using 61 horns and a reflector with the aperture diameter of 2.2m. Then we compared the number of the outage areas using dynamically controlled radiation pattern formed by the array-fed reflector antenna with that using static radiation pattern formed by shaped reflector antenna while assuming the same input power to the antenna. According to the simulation during 7days, the accumulated number of outage points using dynamic radiation pattern was reduced to less than 50% compared to that using static radiation pattern.
12 citations
Patent•
07 May 2004TL;DR: In this paper, a directional antenna is formed by associating a stationary generally omni-directional antenna element with an RF reflector formed from a folded, parabolic or elliptical RF reflecting surface.
Abstract: A directional antenna formed by associating a stationary generally omni-directional antenna element with an RF reflector formed from, for example, a folded, parabolic or elliptical RF reflecting surface. Rotating the RF reflector about the stationary antenna element creates a directional characteristic in the resulting antenna over, for example, a 360 degree range of azimuth. Rotation of the RF reflector may be remotely driven by a motor coupled, for example, to a gear connected to the RF reflector. The direct connection of the antenna element and the enclosed lightweight rotating assembly provide a reliable, easy to install and cost effective antenna.
12 citations
Patent•
02 Jul 1971
TL;DR: A reflector antenna has a reflector with an offset feed which is partially encompassed by a shroud which may reflect, absorbing, or both, to energy radiated by the feed.
Abstract: A reflector antenna has a reflector with an offset feed. The reflector is partially encompassed by a shroud which may be reflecting, absorbing, or both, to energy radiated by the feed. The shroud is effective to block energy radiated by the feed that would otherwise spill over the edge of the reflector, only along a portion of the edge less than its entirety.
12 citations
TL;DR: In this article, a large inflatable elastic antenna reflector is modeled as an isotropic elastic membrane using a linear stress-strain constitutive relation, and the performance of antennas of various size and reflector depth is explored.
Abstract: For parabolic antennas with sufficient surface accuracy, more power can be radiated with a larger aperture size. This paper explores the performance of antennas of various size and reflector depth. The particular focus is on a large inflatable elastic antenna reflector that is supported about its perimeter by a set of elastic tendons and is subjected to a constant hydrostatic pressure. The surface accuracy of the antenna is measured by an RMS calculation, while the reflector phase error component of the efficiency is determined by computing the power density at boresight. In the analysis, the calculation of antenna efficiency is not based on the Ruze Equation. Hence, no assumption regarding the distribution of the reflector surface distortions is presumed. The reflector surface is modeled as an isotropic elastic membrane using a linear stress-strain constitutive relation. Three types of antenna reflector construction are considered: one molded to an ideal parabolic form and two different flat panel design patterns. The flat panel surfaces are constructed by seaming together panels in a manner that the desired parabolic shape is approximately attained after pressurization. Numerical solutions of the model problem are calculated under a variety of conditions in order to estimate the accuracy and efficiency of these antenna systems. In the case of the flat panel constructions, several different cutting patterns are analyzed in order to determine an optimal cutting strategy.
12 citations
10 Apr 2016
TL;DR: A novel mesh deployable Ka-band antenna design folding in a 1.5U stowage volume suitable for 6U (10×20×30cm3) class CubeSats is presented and measurement results show excellent agreement with simulations.
Abstract: This paper presents a novel mesh deployable Ka-band antenna design folding in a 1.5U (10×10×15cm3) stowage volume suitable for 6U (10×20×30cm3) class CubeSats. Detailed results, considering all aspects of the deployable mesh reflector antenna, show that 42.6 dBi gain and 52% aperture efficiency is achievable at 35.75GHz. The mechanical deployment mechanism is also described as it constraints and drive the RF choices. The mesh prototype antenna has been fabricated and measurement results show excellent agreement with simulations.
12 citations