SANTILLAN-HARO, Daniel et al. Cross polarization in microwave antennas: Case study of a circular waveguide. []. , 1, 2, pp.30-37.   01--2021. ISSN 2631-2654.  https://doi.org/10.37135/unach.ns.001.02.03.

During the last decade, the subject of antenna polarization attracts great interest. The improve of the cross polarization generates a distribution of a highly symmetric field in the aperture of the antenna, however, it is difficult to make low cross polarization circular sources to operate over a wide bandwidth. In this paper, a study case is presented to improve the cross polarization of a circular aperture. As the circular waveguide has a poor cross polarization, three possible solutions have been considered to improve the cross polarization in previous works. The first solution is based on a metallic disk, which after an optimization process obtains an external diameter of 90.42mm. The second solution is based on a metallic ring around the circular waveguide, the optimized dimension of the external diameter ring is 90.42mm with a thickness of 1.63mm. The third solution is based on two rings around the circular waveguide, which optimized dimensions of the rings are an outer diameter of 122.48mm, and an inner diameter of 90.42mm. This knowledge is valuable to explain the improvement of matching level of a patch antenna with a ring around 5.8 GHz.

: Circular polarization; cross polarization; metallic rings; numerical analysis; patch antenna.

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