Abstract
The most important limitation in using orbital angular momentum (OAM) multiplexing in communication is the range, so that because of OAM beam propagation, it cannot be used in the long range. It was found that when several original OAM modes were superimposed together, the concentrated EM wave in a certain angular range, with its effective phase diagram, could constitute a new quasi-OAM (QOAM) mode. In this article, the superposition of multiple OAM modes for beam concentration using uniform circular array is presented to in order to realize long-range communication. The simulation results show that the orthogonality characteristic of the two QOAMs produced by the proposed method is more than 10 decibels.
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