Low-Sidelobe Multimode Horn Design for Circular Coverage Based on Quadratic Programming Approach

Hiroyuki DEGUCHI  Mikio TSUJI  Hiroaki WATANABE  

IEICE TRANSACTIONS on Electronics   Vol.E91-C    No.1    pp.3-8
Publication Date: 2008/01/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.1.3
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: Antenna Theory
horn antennas,  antenna gain,  radiation patterns,  optimization,  

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To obtain a broad circular-coverage beam with low sidelobe, this paper proposes optimization design based on the quadratic programming approach for circular horns. The desired excitation coefficients of higher-order modes are pre-determined and also evaluated by calculating universal radiation patterns. We show a design example of a multimode horn which has circular-coverage beam with low sidelobe level of about -30 dB. The effectiveness of the designed horn is discussed by evaluating VSWR and radiation characteristics in X-band numerically and experimentally.