1. RF and Microwave Laboratory, Federal Institute of Metrology METAS, Bern-Wabern, Switzerland
2. Gymnasium Oberwil, Oberwil, Switzerland
3. Univ. Lille, CNRS, Univ. Polytechnique Hautsde-France, UMR 8520–IEMN, Lille, France
4. Biophysics Institute, Johannes Kepler University, Linz, Austria
5. Laboratoire national de métrologie et d’essais (LNE), Trappes, France