科研之友
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摘要
In this article, beam-steering orbit angular momentum (OAM) beams by mechanical rotating transmitarray, which is formed by three layer metasurfaces (MSs), is proposed. It is the first time to achieve steering OAM beams based on mechanical rotating transmitarray in microwave region. By mechanically rotating the middle and bottom MSs, different phase distributions are obtained, and then OAM beams in corresponding directions are generated. OAM beam can be dynamically generated and independently controlled to steer toward any horizontal direction, and from -40 degrees to 40 degrees in vertical direction. As example, two transmitarrays with mode l = 1 or 2 are designed. To validate the method, one of the transmitarray is fabricated and measured. The measured peak gain is 18.3 dBi.
