Gain-Reconfigurable Hybrid Metal-Graphene Printed Yagi Antenna for Energy Harvesting Applications - Alex-Amor, A; Palomares-Caballero, A; de la Fuente, E; Muriel-Barrado, A; Valenzuela-Valdés, J; Fernández-González, JM; Padilla, P (2019 13th European Conference On Antennas And Propagation (Eucap), 2019)