Design and Experimental Analysis of UCA Antennas for Enhanced SWIPT Using OAM Modes

This paper investigates the potential use of electromagnetic waves with orbital angular momentum (OAM) modes for simultaneous wireless information and power transfer (SWIPT). Due to the use of the same frequency, traditional SWIPT approaches have been hindered by interference between power and data signals. OAM modes have attracted interest in SWIPT owing to their mode orthogonality property, reducing the interference between power and data signals. A uniform circular array antenna generating OAM modes +1, -1, and 0 at 2.4 GHz is utilized in the preliminary experimental study of SWIPT. This investigation explores using OAM modes for SWIPT and quantifies the isolation level that can be achieved at the same frequency over the different transmission distances. The experimental results show a minimum isolation of 11 dB between Mode +1 and Mode -1, and 7 dB for Mode 0 is achieved. The findings demonstrate the feasibility of the OAMbased SWIPT advantageous approach over traditional methods, providing valuable insights into the use of OAM antennas for reliable energy harvesting and large-scale IoT connectivity in future 6G networks.