Link Distance and Carrier Frequency Dependence of Propagation Attenuation in OAM Multiplexing Using Parabolic Antenna

The adoption of a parabolic antenna is effective in further improving the transmission performance of orbital angular momentum (OAM) multiplexing. Although it has been demonstrated that the propagation attenuation for OAM multiplexing using a parabolic antenna does not necessarily depend on the OAM mode for a relatively short link distance, the influence of the link distance on propagation attenuation has not been clarified comprehensively. In this study, we investigate the transmission performance of OAM multiplexing using a parabolic antenna over a wide range of link distances. In detail, the received power in the use of a parabolic antenna or uniform circular array (UCA) is analyzed using the link distance, carrier frequency, and receiving antenna radius, which clarifies the effectiveness of planar reception created by the parabolic antenna on the received power. Based on these results, the impact of the OAM mode on propagation attenuation is demonstrated at different link distances.