Low Sidelobe Single-Layer Slotted Waveguide Arrays at 76 GHz Band

Yuichi KIMURA  Kenji FUKAZAWA  Jiro HIROKAWA  Makoto ANDO  Naohisa GOTO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E84-B   No.9   pp.2377-2386
Publication Date: 2001/09/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Innovation in Antennas and Propagation for Expanding Radio Systems)
Category: Millimeter-Wave Antennas
Keyword: 
slot,  waveguide,  low sidelobe,  millimeter wave antenna,  

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Summary: 
This paper presents the design of low sidelobe single-layer slotted waveguide arrays. The Taylor distribution with -25 dB sidelobe level is synthesized in two orthogonal directions in the aperture. The multiple-way power divider consisting of a cascade of novel π-junctions is introduced; each π-junction, two-way power divider, is so designed as to accept unequal power dividing by adopting an offset window. The smooth Taylor distribution is realized at the output of the multiple-way power divider, which was originally developed only for uniform distribution. A model antenna for Taylor distribution is tested at 76 GHz. The measured sidelobe level is below -24 dB in both E- and H-plane. The highest gain is 34.5 dBi with 50% efficiency which is only 15% lower than that for uniform aperture illumination.