Sidelobe Suppression in Both the E and H Planes Using Slit Layers over a Corporate-Feed Waveguide Slot Array Antenna Consisting of 2×2-Element Radiating Units


IEICE TRANSACTIONS on Communications   Vol.E103-B    No.9    pp.960-968
Publication Date: 2020/09/01
Publicized: 2020/03/16
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019EBP3204
Type of Manuscript: PAPER
Category: Antennas and Propagation
full-corporate-feed,  millimeter-wave antenna arrays,  Taylor distribution,  waveguide slot arrays,  

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The sidelobe level at tilts around 30-40 degrees in both the E and H planes due to a tapered excitation of units of 2×2 radiation slots is suppressed by introducing slit layers over a corporate-feed waveguide slot array antenna. The slit layers act as averaging the excitation of the adjacent radiating slots for sidelobe suppression in both planes. A 16×16-element array in the 70GHz band is fabricated. At the design frequency, the sidelobe levels at tilts around 30-40 degrees are suppressed from -25.4dB to -31.3dB in the E-plane and from -27.1dB to -38.9dB in the H-plane simultaneously as confirmed by measurements. They are suppressed over the desired range of 71.0-76.0GHz frequencies, compared to the conventional antenna.