Abstract
The local angular momentum (AM) properties of arbitrary polarised orbital AM (OAM) beams become important when the radio OAM properties are used for remote sensing. In this study, based on the decomposition of ϕ- directional Poynting vector, the local AM mode is decomposed into a local OAM mode, a local spin AM (SAM) mode, and a new component named local coupling AM mode (CAM), which is related to the ϕ- directional coupling Poynting vector and dependent on the polarisation state of the OAM beams. The summation of the local OAM mode and the local SAM mode is found to be equal to the local topological charge which is physically related to the flow of the local azimuthal linear momentum density. The above conclusions are theoretically analysed and simulation verified by the different polarised OAM beams generated by different directional circular antenna arrays.
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