1. University of Duisburg-Essen,Faculty of Engineering,Dep. Components for High-Frequency Electronics (BHE),Duisburg,Germany,D-47057
2. University of Duisburg-Essen, and CENIDE ® Center for Nanointegration Duisburg-Essen,General and Theoretical Electrical Engineering (ATE), Faculty of Engineering,Duisburg,Germany,D-47048