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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24 Jun 1991
TL;DR: In this article, the performance degradation of distorted and/or scanned reflector antennas is manifested primarily in a decrease in peak gain and in an increase in radiation pattern sidelobes.
Abstract: The performance degradation of distorted and/or scanned reflector antennas is manifested primarily in a decrease in peak gain and in an increase in radiation pattern sidelobes. The author discusses a procedure for determination of the excitation coefficients of the array feed in order to approximate the 'ideal' performance for both gain and sidelobes. Representative results of 6 GHz are presented for a hexagonal array of 1.5 lambda diameter dual-mode horns with center-to-center spacing of 1.5 lambda , to compensate for the surface distortion of one offset aperture of a mesh deployable reflector antenna. >
9 citations
01 Nov 2016
TL;DR: In this paper, the design of 1-18 GHz printed LPDA antenna is used as a linearly polarized feed for the parabolic reflector which has a 1.2 m diameter.
Abstract: LPDA (Log Periodic Dipole Arrays) as a reflector antenna feed offers wide range for applications. However, phase center of the LPDA changes depending on the operation frequency, which, in turn, leads to defocusing loss as frequency changes. In this study, design of 1–18 GHz printed LPDA antenna is used as a linearly polarized feed for the parabolic reflector which has a 1.2 m diameter. Optimal feed position and f/D ratio are chosen through extensive simulations. Performance parameters such as VSWR, gain and half power beamwidth are presented. Minimum aperture efficiency was recorded as 0.27 at the target band.
9 citations
TL;DR: In this article, a new type of H-plane horn antenna based on the parabolic reflector principle is proposed, which is used for generating large radiation aperture and uniform phase distribution at the aperture, yielding a fan beam with very narrow beamwidth.
Abstract: A new type of H-plane horn antenna based on the parabolic reflector principle is proposed in this paper. The parabolic reflector is constructed with the substrate integrated waveguide technology and is used for generating large radiation aperture and uniform phase distribution at the aperture, yielding a fan beam with very narrow beamwidth in H-plane. A feeding source composed of a probe and an inductive-post reflector is designed as the feed, which can transmit a unidirectional incident wave toward the parabolic reflector. Two metallic strips with post arrays are designed as a transition for the matching between the horn aperture and the free space and also work as a director to realize unidirectional radiation and reduce the front-to-back ratio. The antenna has the advantages of narrow beam, compact size, and easy integration, and the operation bandwidth is from 27 GHz to 35.5 GHz. The experimental results show good agreement with the simulated results.
9 citations
Patent•
20 Jun 2010
TL;DR: In this article, a waveguide matching holder connects a circular cross section waveguide via a circular cavity, and a rectangular waveguide feed via a rectangular cavity, the rectangular and the circular cavities being shaped to merge into each other.
Abstract: A radome comprises a structure covering an antenna, the structure being substantially transparent to radiation of the antenna in a first direction and being less transparent to radiation of the antenna when deviating from the first direction, thereby imparting a directional profile to radiation of the antenna. The millimeter wave antenna structure comprises a sub-reflector lens, and a reflector, the sub-reflector lens in turn comprising a reflecting metal plate and a lens shaped dielectric material, the lens shaped dielectric material and the reflecting metal plate being shaped together to provide a predetermined radiation illumination pattern on the reflector. A waveguide matching holder connects a circular cross section waveguide via a circular cavity, and a rectangular waveguide feed via a rectangular cavity, the rectangular and the circular cavities being shaped to merge into each other.
9 citations
28 Jun 1993
TL;DR: In this article, a cheap alternative to the swan-neck feed, which can obtain low sidelobes even without an absorbing cylinder, is presented, called the rectangular hat feed.
Abstract: A cheap alternative to the swan-neck feed, which can obtain low sidelobes even without an absorbing cylinder is presented. This feed is called the rectangular hat feed. The ideas of soft and hard surfaces have been used to optimize the performance of this linearly polarized feed. It can give low sidelobes and has broader bandwidth than the circular hat feed. >
9 citations