Topic
Cassegrain antenna
About: Cassegrain antenna is a research topic. Over the lifetime, 3207 publications have been published within this topic receiving 28278 citations.
Papers published on a yearly basis
Papers
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12 Jan 2006
TL;DR: In this article, the parabolic reflector was used for satellite ground station antennas having a wide field of view in comparison to the satellites with which the antenna connects, and a feed comprising at least two dielectric rod-based surface waveguides coupled to the reflector configured to have a high sensitivity for a target satellite within the angular half-width of the reflected reflector beam and a low sensitivity for neighboring interfering satellites within the reflected beam.
Abstract: The present invention is applicable to satellite ground station antennas having a wide field of view in comparison to the satellites with which the antenna connects One embodiment includes a parabolic reflector having a size that corresponds to a beam with an angular half-width larger than the spacing between neighboring interfering satellites It also has a feed comprising at least two dielectric rod-based surface waveguides coupled to the parabolic reflector configured to have a high sensitivity for a target satellite within the angular half-width of the reflector beam and a low sensitivity for neighboring interfering satellites within the angular half-width of the reflector beam
158 citations
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TL;DR: In this paper, a microwave holographic technique for the determination of amplitude and phase of the principal and cross-polarized aperture fields of large reflector antennas is described, which utilizes the elevation over azimuth scanning system normally associated with these antennas, and appears to be unique among other proposed methods of field probing.
Abstract: A microwave holographic technique for the determination of amplitude and phase of the principal and cross-polarized aperture fields of large reflector antennas is described. The hologram formation process utilizes the elevation over azimuth scanning system normally associated with these antennas, and, in this respect, appears to be unique among other proposed methods of field probing. The present work describes the means used to obtain vital information on the antenna structure such as E - and H -plane phase centers of the feed, and rms values of the reflector surface profile errors. Accurate prediction of E - and H -plane radiation patterns in the near- and far-field is also demonstrated.
154 citations
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05 Mar 2014
TL;DR: In this article, the enclosures for radios, parabolic dish antennas, and side lobe shields are described, and a parabolic circular reflector bounded by a side lobe shield that extends along a longitudinal axis of the dish antenna in a forward direction forming a front cavity and a sidewall connecting the reflector and the antenna to form a rear cavity.
Abstract: Enclosures for radios, parabolic dish antennas, and side lobe shields are provided herein. A dish antenna includes a parabolic circular reflector bounded by a side lobe shield that extends along a longitudinal axis of the dish antenna in a forward direction forming a front cavity, and a sidewall that extends along the longitudinal axis of the dish antenna in a rearward direction forming a rear cavity.
151 citations
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NEC1
TL;DR: In this article, a parabolic reflector was used to reflect the radio waves from the primary radiator to shield against unnecessary radiation radio waves among the radiations from the radio device and reflected by the parabolic reflected reflector.
Abstract: An antenna device includes: a radio device for radio wave transmission; a primary radiator that has a function to radiates radio waves generated by the radio device; a parabolic reflector that reflects the radio waves radiated from the primary radiator; a shroud that shields against unnecessary radiation radio waves among the radio waves radiated from the primary radiator and reflected by the parabolic reflector; and an antenna mounting mechanism that fits the parabolic reflector to an antenna attachment pole. The shroud is arranged so as to cover at least a right and left of the parabolic reflector, the radio device and the primary radiator are arranged inside the shroud, and the antenna mounting mechanism fits the parabolic reflector to the antenna attachment pole so that the antenna attachment pole is located at a lateral center position of the parabolic reflector.
150 citations
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TL;DR: A novel mesh deployable Ka-band antenna design that folds in a 1.5 U stowage volume suitable for 6 U (10 × 20 × 30 cm3) class CubeSats is presented.
Abstract: CubeSats are positioned to play a key role in Earth Science, wherein multiple copies of the same RADAR instrument are launched in desirable formations, allowing for the measurement of atmospheric processes over a short evolutionary timescale. To achieve this goal, such CubeSats require a high-gain antenna (HGA) that fits in a highly constrained volume. This paper presents a novel mesh deployable Ka-band antenna design that folds in a 1.5 U $(10\times 10 \times 15 \,\text{cm}^{3})$ stowage volume suitable for 6 U $(10\times 20 \times 30 \,\text{cm}^{3})$ class CubeSats. Considering all aspects of the deployable mesh reflector antenna including the feed, detailed simulations and measurements show that 42.6-dBi gain and 52% aperture efficiency is achievable at 35.75 GHz. The mechanical deployment mechanism and associated challenges are also described, as they are critical components of a deployable CubeSat antenna. Both solid and mesh prototype antennas have been developed and measurement results show excellent agreement with simulations.
149 citations