Institute of Agrophysics Polish Academy of Science 4 Doświadczalna Str., 20-290 Lublin, Poland Phone: +48 81 744 5061, Fax: +48 81 744 5067 e-mail: w.skierucha@ipan.lublin.pl
Institute of Radioelectronics, Electronics Faculty Military University of Technology 2 S. Kaliskiego str., 00-908 Warsaw, Poland Phone: +48 26 183 9831, +48 26 183 7461 e-mail: zenon.szczepaniak@wat.edu.pl