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Reflection Characteristics of Center-Feed Single-Layer Waveguide Arrays
Yasuhiro TSUNEMITSU SeHyun PARK Jiro HIROKAWA Makoto ANDO Yohei MIURA Yasuhiro KAZAMA Naohisa GOTO
IEICE TRANSACTIONS on Communications
Publication Date: 2005/06/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation)
alternating phase fed array, center-feed, single-layer waveguide, reflection,
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The reflection characteristics of large alternating-phase fed single-layer waveguide arrays with center-feeds are investigated to identify the mechanism for bandwidth narrowing effects. Firstly, the overall reflection for the whole array is analyzed by FEM and fine agreement with measurements is demonstrated. It is deviating from the conventional prediction based upon a simple sum of reflections from components in the array, such as the multiple-way power divider, the slot waveguides and the aperture at the antenna input. Careful diagnosis reveals that the mutual coupling between the alternating phase waveguides via external half-space is the key factor in reflection accumulation. Amongst all, the slot with strong excitation whose position depends upon the aperture illumination design produces the dominant contribution in the mutual coupling.