Reflection Characteristics of Center-Feed Single-Layer Waveguide Arrays

Yasuhiro TSUNEMITSU
SeHyun PARK
Jiro HIROKAWA
Makoto ANDO
Yohei MIURA
Yasuhiro KAZAMA
Naohisa GOTO

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B    No.6    pp.2313-2319
Publication Date: 2005/06/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.6.2313
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation)
Category: 
Keyword: 
alternating phase fed array,  center-feed,  single-layer waveguide,  reflection,  

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Summary: 
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.