OAM Multiplexing of 5 GHz Band Microwave Signal Propagating Along PVC Pipe Walls for a Buried Pipe Inspection Robot

This study investigated the orbital angular momentum (OAM) multiplexing of a 5 GHz band microwave signal propagating along PVC pipe walls for a buried pipe inspection robot. The OAM modes that propagate along the PVC pipe wall were observed by electromagnetic simulation. The results showed that the OAM multiplexing system with the microwave signal propagating along the pipe was 2.5 times the system capacity compared to the system with the microwave signal propagating inside the pipe.