An infinitesimal dipole modeling (IDM)-based analysis method is proposed to calculate the coupling coefficient (CC) between two uniform circular array (UCA)-orbital angular momentum (OAM) antennas. The proposed method is demonstrated to be more accurate than the asymptotic expression while also being more computationally efficient compared to the method of moments (MoM)-based full-wave simulation. Moreover, the proposed method enables CC analysis between UCAs operating in different OAM modes or in the presence of misalignment. The proposed method can potentially be utilized to estimate channel coefficients electromagnetically and to design OAM communication systems.
This work was supported in part by the Ministry of Science and ICT (MSIT), Korea, through the Information Technology Research Center (ITRC) support program under Grant IITP-2024-RS-2024-00436406 supervised by the Institute for Information and Communications Technology Planning and Evaluation (IITP) and in part by the National Research Foundation of Korea (NRF) funded by the Korea Government (MSIT) under Grant NRF2022R1I1A3073740.
