Metamorphic HEMT MMICs and Modules Operating Between 300 and 500 GHz. - Axel Tessmann; Arnulf Leuther; Volker Hurm; Ingmar Kallfass; Hermann Massler; Michael Kuri; Markus Riessle; Martin Zink; Rainer Lösch; Matthias Seelmann-Eggebert; Michael Schlechtweg; Oliver Ambacher (IEEE J. Solid State Circuits, 2011)