Phase‐Space Engineering of Terahertz Self‐Accelerating Beams With 3D‐Printed Metasurfaces for Blockage Mitigation

Sixth‐generation (6G) wireless networks require robust connectivity in dynamic propagation environments, yet line‐of‐sight blockage remains a critical challenge for link reliability. Self‐accelerating beams propagate along curved trajectories in free space without external relay nodes, offering a physical carrier for non‐line‐of‐sight (NLOS) communications. However, conventional strategies for obstacle avoidance primarily rely on tailoring the main lobe trajectory, while underutilizing additional degrees of freedom such as the transverse‐field distribution and initial launch position. Here, we propose a phase‐space framework based on the Wigner distribution function (WDF) to analytically derive phase distributions in both real space and Fourier space, which are implemented on low‐cost 3D‐printed terahertz (THz) metasurfaces to generate self‐accelerating beams. By decoupling trajectory control from the transverse‐field distribution, the transverse field is independently rotated without altering the prescribed trajectory. Such transverse‐field reorientation redistributes the side‐lobe energy and reduces its overlap with the obstacle. Under representative blockage conditions, the measured normalized received power of the favorable rotated field reached , substantially higher than the obtained for the unrotated field. This strategy demonstrates the potential of phase‐space‐engineered self‐accelerating beams for blockage‐tolerant THz beam delivery and future 6G wireless links.