IEICE Transactions on Communications
Online ISSN : 1745-1345
Print ISSN : 0916-8516

This article has now been updated. Please use the final version.

A Broadband Circularly Polarized Waveguide Antenna Design for Low Cross-polarization
Ryoji YAMAUCHITakeshi FUKUSAKO
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JOURNAL RESTRICTED ACCESS Advance online publication

Article ID: 2015EBP3544

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Abstract
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 9.75 GHz.
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© 2016 The Institute of Electronics, Information and Communication Engineers
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