Simulation of Polarising and Reflector Gratings for High Power mm Waves Carsten Lechte, Walter Kasparek, Burkhard Plaum, Fritz Leuterer, Martin Schubert, Jörg Stober and Dietmar Wagner EPJ Web Conf., 203 (2019) 04010 Published online: 25 March 2019 DOI: 10.1051/epjconf/201920304010