Summary
International Symposium on Antennas and Propagation
2006
Session Number:2POS
Session:
Number:2POS-12
Post-Wall Waveguide Circuit Consisting of π-junctions for a Center-Feed Parallel Plate Slot Array
Koh Hashimoto, Jiro Hirokawa, Makoto Ando,
pp.1-4
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
The center-feed structure is applied to the post-wall waveguide fed parallel plate slot array to widen the frequency bandwidth. The center-feed antenna has a blocking area at its center. This blocking makes the sidelobe level high in the E-plane, therefore the width of the blocking area should be reduced. The authors propose a novel center-feed waveguide consisting of π-junctions for this reduction. This structure can make the blocking width reduced from 2.6 λ0 to 2.1 λ0. The measured sidelobe level in the E-plane of the novel feed using π-junctions is suppressed down to -9.4 dB while that of the conventional feed using cross-junctions is -7.8 dB in uniformly excited antennas.