Interview with Hans Hartnagel, Professor of High Frequency Electronics at the Technical University of Darmstadt (Germany), and Chair of Excellence at Carlos III University of Madrid, sponsored by the Department of Electronic Technology. He speaks about his main fields of research, their applications to everyday life, and his research project at UC3M. Entrevista con Hans Hartnagel, catedrático de Electrónica de Altas Frecuencias de la Universidad de Darmstadt (Alemania)y Catedrático de Excelencia de la Universidad Carlos III de Madrid, avalado por el departamento de Tecnología Electrónica.