A Suspended Stripline Fed Dual-Polarized Open-Ended Waveguide Subarray with Metal Posts for Phased Array Antennas


IEICE TRANSACTIONS on Communications   Vol.E104-B    No.3    pp.295-303
Publication Date: 2021/03/01
Publicized: 2020/09/09
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2020EBP3067
Type of Manuscript: PAPER
Category: Antennas and Propagation
antenna array,  dual-polarization,  open ended waveguide,  phased array,  suspended stripline,  

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This paper proposes a dual linear-polarized open-ended waveguide subarray designed for use in phased array antennas. The proposed subarray is a one-dimensional linear array that consists of open-ended waveguide antenna elements and suspended stripline feed networks to realize vertical and horizontal polarizations. The antenna includes a novel suspended stripline-to-waveguide transition that combines double- and quad-ridge waveguides to minimize the size of the transition and enhance the port isolation. Metal posts are installed on the waveguide apertures to eliminate scan-blindness. Prototype subarrays are fabricated and tested in an array of 16 subarrays. The experimental tests and numerical simulations indicate that the prototype subarray offers a low reflection coefficient of less than -11.4dB, low cross-polarization of less than -26dB, and antenna efficiency above 69% in the frequency bandwidth of 14%.