Novel Phased Array-Fed Dual-Reflector Antenna with Different Orthogonal Cross-Section by Imaging Reflector Antenna and Ring-Focus Cassegrain Antenna

Michio TAKIKAWA  Yoshio INASAWA  Hiroaki MIYASHITA  Izuru NAITO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E98-C    No.1    pp.8-15
Publication Date: 2015/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E98.C.8
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: 
Keyword: 
Imaging Reflector Antenna,  Ring-focus Cassegrain Antenna,  Doubly Curved Reflector,  Phased Array-fed Reflector Antenna,  Beam-Scanning Function,  Center-Fed Reflector Antenna,  

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Summary: 
We propose a novel phased array-fed dual-reflector antenna that reduces performance degradation caused by multiple reflection. The marked feature of the proposed configuration is that different reflector profiles are employed for the two orthogonal directions. The reflector profile in the beam-scanning section (vertical section) is set to an imaging reflector configuration, while the profile in the orthogonal non-beam-scanning section (horizontal section) is set to a ring-focus Cassegrain antenna configuration. In order to compare the proposed antenna with the conventional antenna in which multiple reflection was problematic, we designed a prototype antenna of the same size, and verified the validity of the proposed antenna. The results of the verification were that the gain in the designed central frequency increased by 0.4 dB, and the ripple of the gain frequency properties that was produced by multiple reflection was decreased by 1.1 dB. These results demonstrated the validity of the proposed antenna.