The Unified Synthesis of Flat-Beam Multi-Directional Metasurface Rectennas: A Review for Pervasive Wireless Power Beyond Directional Limits. - Athul Parameswaran; Manoj Kumar 026; Basudev Majumder; Ignacio Julio García Zuazola; M. Jaleel Akhtar; Manish Kumar (IEEE Access, 2026)