Radiation pattern analyses of circular aperture antenna to generate radio orbital angular momentum

Abstract

Circular aperture antenna recently has been regarded as a nature source to generate high power radio orbital angular momentum (OAM) in millimeter (mm) wave; however, the radiation pattern was not investigated. Theoretical derivation of radiation pattern of circular aperture OAM antenna is conducted to evaluate the performance. Extensive simulations verify the validity of the theoretical result. Furthermore, performance of such antenna excited by orthogonal TE and TM modes is compared, which shows the potential application for TE_g1 mode to create pure OAM g–1 mode in a practical system, providing guidance for generation of twisted radio waves in mm-wave bands.

Keywords

orbital angular momentum (OAM) / twisted radio wave / millimeter-wave / circular aperture antenna / radiation pattern / TE mode / TM mode

References

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