Hans L. Hartnagel, Prof. Dr. Eng. Dr. Ing. h.c. mult., worked as scientist in the German, French, Japanese and U.S. industries (including David Sarnoff Research Center, Princeton) before being appointed as professor for microwave technology in Newcastle, England. Later he became professor for microwave electronics at the Technical University Darmstadt, Germany. Dr. Hartnagel made globally significant contributions to the Terahertz technology; he published over 800 scientific papers on microwave engineering, contributed to many books and holds numerous patents.Rüdiger Quay, Prof. Dr. habil. received the Diplom-degree in physics from Rheinisch-Westfälische Technische Hochschule (RWTH), Aachen, Germany, in 1997, and a second Diplom in economics in 2003. In 2001 he joined the Fraunhofer Institute of Applied Solid-State Physics Freiburg. He is currently the deputy director of Fraunhofer IAF. In 2020 he was appointed also a Fritz-Hüttinger professor at the Department for Sustainable Systems Engineering (INATECH), Albert-Ludwig University, Freiburg, Germany. Ulrich L. Rohde, Prof. Dr.-Ing. habil. Dr.Ing.h.c.mult is a professor of technical informatics, Microwave Systems, Universität der Bundeswehr, Germany; staff member of other universities worldwide; partner of Rohde & Schwarz, Munich, Germany, as well as chairman of the board of Synergy Microwave Corporation. Formerly professor of electrical engineering at George Washington University and the University of Florida, Dr. Rohde has also consulted on numerous communication projects in industry and government. He has authored over 350 papers, 6 books and holds 35 patents.Matthias Rudolph, Prof. Dr.-Ing. received his Dipl.‐Ing. degrees from the Berlin Institute of Technology in 1996 and the Dr.-Ing. degree from Darmstadt University of Technology in 2001. In 1996, he joined theFerdinand‐Braun‐Institut (FBH), Leibniz‐Institut für Höchstfrequenztechnik, Berlin, Germany. In 2009, he was appointed the Ulrich‐L.‐Rohde Professor at the Brandenburg University of Technology, Cottbus, Germany, and also heads the Low‐Noise Components Lab at the Ferdinand-Braun-Institut.
