All-Metallic Orbital Angular Momentum Beam Generator for Future High-Power Microwave Applications

In addition to enhancing spectral efficiency in wireless communication systems, electromagnetic waves carrying Orbital Angular Momentum (OAM) offer several advantages in high-power microwave applications. Consequently, numerous state-of-the-art OAM generators have been reported, the majority of which are based on dielectric structures. However, in high-power scenarios, such dielectric-based generators are inherently constrained by their limited power-handling capability. To overcome this limitation, this paper presents a simple and effective technique for generating OAM beams using an all-metallic structure suitable for high-power microwave applications. The proposed design is validated through both simulations and experimental characterization of its OAM properties. The contrasting features distinguishing the proposed structure from the existing OAM generators are its high mode purity, simple feeding scheme, and large power handling capability.