Notice of Removal: Design of a High-Gain Single-Feed Quad-Beam Metalens With Polarization Conversion at 0.1 THz

This paper presents a novel 2-bit single-feed quad-beam metalens antenna for sub-THz links powered by traveling wave tubes. The metalens surface, consisting of 7692 unit cells with orthogonal slots and vias, allows precise electromagnetic wave manipulation by adjusting slot lengths to control the transmission phase. Rotating the lower-layer slots in opposite directions creates a stable 180° phase difference, providing over 530° phase coverage. The design is fed by a custom pyramid horn with a WR-10 waveguide interface, optimized for single-unit fabrication. The superposition method was used to achieve the required phase distribution, generating four beams at φ = (0°, 90°, 180°, 270°) and θ = 15°, with a peak gain of 32.28 dBi at 106 GHz and all beams above 30.15 dBi within 102-109.5 GHz. This high-performance metalens offers a promising solution for future 6G high-capacity links.