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A Broadband Circularly Polarized Waveguide Antenna Design for Low Cross-Polarization
Ryoji YAMAUCHI Takeshi FUKUSAKO
IEICE TRANSACTIONS on Communications
Publication Date: 2016/10/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
Category: Antennas and Propagation
broadband antenna, circular waveguide antenna, circular polarization, cross-polarization, L-shaped probe, axial ratio,
Full Text: PDF(4.3MB)>>
An L-shaped probe with a surrounding aperture such as a waveguide can generate circular polarization (CP) waves. Circular waveguide antennas using an L-shaped probe have broadband characteristics both in axial ratio (AR) and in input impedance, however cross-polarization (XPOL) is easily generated due to its asymmetrical structure resulting in a radiation pattern that has narrow CP azimuth range. In this paper, design techniques to reduce the XPOL generated from a circular waveguide antenna using an L-shaped probe are proposed. As a result, XPOL is reduced by around 10 dB, and CP is radiated over a wide angle range of 120-150° covering frequencies from 7.35 to 9.75GHz.