Alireza Shamsafar of Ampleon, discusses various topics surrounding millimeter-wave frequencies including mmW applications (5G, point-to-point, RADAR, SATCOM, backhaul...), the use of mmW frequencies to empower 5G communications, design challenges at mmW frequencies, model extraction and model validation at mmW frequencies, practical tips-and-tricks, and finally, design examples based on Ampleon's mmW models.