One-Dimensional Electronic Beam-Scanning Center-Fed Imaging Reflector Antenna

Michio TAKIKAWA  Izuru NAITO  Kei SUWA  Yoshio INASAWA  Yoshihiko KONISHI  

IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.1   pp.17-25
Publication Date: 2014/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.17
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: Antenna Technologies
imaging reflector antenna,  doubly curved reflector,  beam-scanning function,  center-fed reflector antenna,  

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We propose a new, compact, center-fed reflector antenna that is capable of one-dimensional electronic beam scanning. The reflector profile in the vertical section (beam-scanning) is set to an imaging reflector configuration, while the profile in the orthogonal horizontal section (non-beam-scanning) is set to a Cassegrain antenna configuration. The primary radiator is a one-dimensional phased array antenna. We choose a center-fed configuration in order to reduce the antenna size as much as possible, despite the fact that the increased blocking area from the primary radiator causes degradation in efficiency compared to the typical offset-type configuration. In the proposed configuration, beam scanning is limited to one dimension, but utilize a compact, center-fed configuration that maintains the features of an imaging reflector antenna. We present the antenna configuration and design method and show that results obtained from the prototype antenna verify the predicted performance.