A Broadband Circularly Polarized Waveguide Antenna Design for Low Cross-Polarization

作者：Yamauchi Ryoji^*; Fukusako Takeshi

来源：IEICE TRANSACTIONS ON COMMUNICATIONS, 2016, E99B(10): 2187-2194.

DOI：10.1587/transcom.2015EBP3544

• broadband antenna
• circular waveguide antenna
• circular polarization
• cross-polarization
• L-shaped probe
• axial ratio

An L-shaped probe with a surrounding aperture such as a waveguide can generate circular polarization (CP) waves. Circular wave guide 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 degrees covering frequencies from 7.35 to 9.75 GHz.

• 出版日期2016-10