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Abstract
An unusual axial ratio analysis based on a quantitative study of the relative magnitude of the far-field radiated by each one of the two orthogonal quasi-degenerate modes excited in a single-feed circularly polarized resonant antenna is presented. Such analysis can be applied to those single-feed circularly polarized resonant antennas whose radiating element layout exhibits at least one symmetry plane. The proposed quantitative analysis gives to the antenna designer more information and physical insights than a conventional parametric analysis of the axial ratio behaviour versus frequency. As an example, the proposed approach is applied to a number of circularly polarized antennas presented in the open literature.
Acknowledgements
The authors would like to acknowledge CST for providing additional resources and technical assistance for the parallel version of CST Microwave Studio®.