1. Leibniz Institute for Solid State and Materials Research Dresden,Germany
2. O. Usikov Institute for Radiophysics and Electronics,Department of solid-state radiophysics,Kharkiv,Ukraine
3. Institute for Microwave Engineering and Photonics, Technische Universität,Darmstadt,Germany
4. Institute of Biological Information Processing: Bioelectronics (IBI-3),Forschungszentrum Jülich,Germany