Design of Post-Wall Feed Waveguide for a Parallel Plate Slot Array by an Analysis Model with Corrected Solid-Walls


IEICE TRANSACTIONS on Communications   Vol.E93-B   No.6   pp.1566-1573
Publication Date: 2010/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1566
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
millimeter-wave antenna,  post-wall waveguide,  parallel plate waveguide,  slot array antenna,  method of moments,  

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A novel analysis model for post-wall waveguide T-junctions is proposed. Equivalent solid-walls for the post-walls to have equal guided wavelength are corrected in the analysis model so that the wall thickness for the coupling windows is set to the difference in the width between the post-wall and the solid-wall waveguides. The accuracy of the proposed model is confirmed by comparing it to an HFSS analysis for the real structure of the post-wall waveguide T-junction including the post surfaces. 61.25 GHz model antennas are fabricated for experimental verification. The reflection of the antenna designed by the modified analysis model is suppressed to below -15 dB over a 5.6 GHz bandwidth, while that in the antenna designed by the conventional model is larger than -15 dB around the design frequency.