Multimode Horn with Low Cross Polarization Optimized for Dual-Band Use

Hiroyuki DEGUCHI  Takaharu GOTO  Mikio TSUJI  Hiroshi SHIGESAWA  Soichi MATSUMOTO  

IEICE TRANSACTIONS on Communications   Vol.E87-B    No.9    pp.2777-2782
Publication Date: 2004/09/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
horn antennas,  aperture efficiency,  cross polarization,  radiation patterns,  

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A multimode horn with both a low cross-polarization component less than -30 dB and good VSWR characteristics has been realized at frequency bands 8.6-9.8 GHz and 10.75-11.15 GHz. The improved performance of the proposed horn is verified by comparing with the previous dual-band double-flared horn. The design method for such a horn is based on the mode-matching approach combined with the optimization procedure. This paper proposes an objective function taking account of a spill-over loss and a rotational symmetry in the radiated field instead of an ideal radiation pattern. The effectiveness of our horn is verified by comparison between experimental results in the X band and predicted ones.