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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TL;DR: In this paper, a flat ultra-wideband 2D reflector designed using transformation optics (TO) is presented, which mimics the electromagnetic characteristics of a curved parabolic reflector that is rotated about its apex to reflect the incident wave to a prescribed direction.
Abstract: This paper presents the design and experimental validation of a flat ultra-wideband 2-D reflector designed using transformation optics (TO). The flat TO reflector mimics the electromagnetic characteristics of a curved parabolic reflector that is rotated about its apex to reflect the incident wave to a prescribed direction. The TO reflector is true-time-delay (TTD) in nature and it offers a very large bandwidth which is theoretically unconstrained. The proof-of-concept TO reflector design is explored by employing an effective material with an inhomogeneous electric response which is realized by an array of dipoles. We experimentally verify the principle of operation of the reflector over a 67% bandwidth and show that it maintains good radiation characteristics and low beam squint. The design considerations, benefits and drawbacks of the proposed TO reflector are discussed.
14 citations
TL;DR: An extension of Rusch's asymptotic physical optics (APO) diffraction theory as applied to a parabolic antenna is presented in this paper, which provides a continuous solution throughout the shadow boundary region.
Abstract: An extension of Rusch's asymptotic physical optics (APO) diffraction theory as applied to a parabolic antenna is presented. This extension provides a continuous solution throughout the shadow boundary region. The complete field expressions and the associated "new" physical optics diffraction coefficients are derived. Using the solution, the diffraction pattern for a 10-ft diameter focal plane parabola at 6 GHz is calculated.
14 citations
TL;DR: In this article, the enhancement of an electromagnetic band-gap (EBG) antenna that is used to feed a reflector antenna for a space multibeam application in the Ka band is presented.
Abstract: This letter presents the enhancement of an electromagnetic band-gap (EBG) antenna that is used to feed a reflector antenna for a space multibeam application in Ka band. One of the main difficulties in a typical focal feed cluster design is to obtain high illumination performances with neighbored and close radiating elements. The new structure presented in this letter tackles this difficulty by using a two-level EBG antenna as a multibeam focal feed. This last one is designed to illuminate a side-fed offset cassegrain antenna (SFOCA) working in Ka band and dedicated to a multibeam telecommunication coverage over Europe. A prototype has been measured, and the reflector antenna performances have been evaluated in order to show the good results obtained with this new multibeam focal feed.
14 citations
14 citations