Compact Multimode Horn with Coaxial Corrugation for Circular Coverage

Takashi KOBAYASHI  Hiroyuki DEGUCHI  Mikio TSUJI  Kouhei OMORI  

IEICE TRANSACTIONS on Electronics   Vol.E93-C    No.1    pp.32-38
Publication Date: 2010/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.32
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
horn antennas,  antenna gain,  radiation patterns,  optimization,  corrugation,  

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For achieving low cross-polarization component in addition to circular-coverage pattern in compact structure, this paper proposes a novel multimode horn with arbitrary coaxial-corrugation configuration which plays two roles of mode converters and chokes. The proposed horn can be designed by iteration of non-linear optimization procedure based on generalized scattering matrices pre-calculated by the mode-matching technique. We show a compact horn with four coaxial corrugations for shaping circular-coverage beam over frequency range of bandwidth 20%. The effectiveness of the designed horn is discussed by evaluating VSWR and radiation characteristics in X-band numerically and experimentally.