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- W4313644225 abstract "The vortex electromagnetic waves carrying the orbital angular momentum (OAM) are an increasing subject of study, and the design of a system capable of generating such waves is also of crucial importance. In this letter, a helical circular array (HCA) has been proposed to generate OAM radio beams. The proposed HCA has a more straightforward and more feasible scheme when compared to uniform circular arrays that require additional phase-shifting devices to form interelement phases. The heights of the proposed HCA elements along the <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>$z$</tex-math></inline-formula> -axis are exploited to generate the different OAM modes. For the high-order OAM modes, the height of the HCA is made more compact with the help of the proposed helical circular subarray (HCSA) configurations with spiral phase positions providing a linear phase delay with the azimuth angle. In addition, at high mode values, the HCSA structure creates a smoother OAM vortex beam than HCA. The full-wave simulation results show that the proposed HCA scheme can be used to generate vortex electromagnetic waves with a spiral phase wavefront structure." @default.
- W4313644225 created "2023-01-07" @default.
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- W4313644225 date "2023-05-01" @default.
- W4313644225 modified "2023-10-16" @default.
- W4313644225 title "Helical Circular Array Configurations for Generation of Orbital Angular Momentum Beams" @default.
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- W4313644225 doi "https://doi.org/10.1109/lawp.2023.3234591" @default.
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