Institution: | (1) Department of Physics, Kaiserslautern University of Technology, 67663 Kaiserslautem, Germany;(2) St. Petersburg State Electrotechnical University, St. Petersburg, 197376, Russia;(3) Darmstadt University of Technology, D-64289 Darmstadt, Germany;(4) Radio Physics Faculty, Shevchenko National University, Kiev, 01033, Ukraine |