Abstract: The presentation will describe how the concept of electromagnetically soft and hard surfaces and metamaterial horns (metahorns) came about. I will also discuss practical antennas enabled by these EM techniques, as well as future opportunities and challenges in antenna and RF design. Co-sponsored by: Staracom Speaker(s): Dr. Erik Lier, Bldg: Pavillons Lassonde, M- , 2500 Chemin de Polytechnique, Montreal, Quebec, Canada, H3T1J4, Virtual: https://events.vtools.ieee.org/m/280076