Multiple-Step Rectangular Horn with Two Orthogonal Sectoral Tapers for Elliptical Beam

Hirotsugu URATA
Masataka OHIRA
Hiroyuki DEGUCHI
Mikio TSUJI

Publication
IEICE TRANSACTIONS on Electronics   Vol.E90-C    No.2    pp.217-223
Publication Date: 2007/02/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.2.217
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: Aperture Antennas
Keyword: 
horn antennas,  elliptical beam,  optimization,  mode-matching method,  Marquardt method,  

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Summary: 
This paper proposes a new rectangular horn with two orthogonal multiple-step taper sections for obtaining a dual-polarized elliptical-beam. One of the sections has a stepwise sectoral taper configuration on both sidewalls that starts with a square waveguide feed and then the other is a taper one on both top and bottom walls toward the rectangular aperture. The proposed taper configuration is useful enough to control higher-order modes required for an elliptical beam and is so simple to apply optimization design based on mode-matching approach. As a design example, we present a rectangular horn with -10 dB beamwidth of 33 90at 9.5-10.5 GHz. The effectiveness of the proposed horn is verified numerically and experimentally.