Design of a Patch Antenna with a Sector Radiation Pattern by Exploiting Topological Properties of Vortex Fields - Barbuto, M.; Miri, M.-A.; Alu, A.; Bilotti, F.; Toscano, A. (2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), Artificial Materials for Novel Wave Phenomena (Metamaterials), 2018 12th International Congress on, 2018)