1. Warsaw University of Technology,Faculty of Electronics and Information Technology,Warszawa,Poland,00-665
2. University of Wroclaw,Institute of Experimental Physics,Wrocław,Poland,50-204
3. RELS Limited,Wrocław,Poland,54-128
4. University of Nottingham,George Green Institute for Electromagnetics Research, Faculty of Engineering,Nottingham,UK,NG7 2RD