1. Institute of Electronic Devices; University of Wuppertal; Rainer-Gruenter-Str. 21 42119 Wuppertal Germany
2. Microstructure Engineering; University of Wuppertal; Rainer-Gruenter-Str. 21 42119 Wuppertal Germany
3. College of Chemistry/Institute of Polymers; Nanchang University; 999 Xuefu Avenue Nanchang 330031 China
4. Institut für Hochfrequenztechnik; Technische Universität Braunschweig; Schleinitzstr. 22 38106 Braunschweig Germany