Yu. I. Alexeev - Dr.Sc. (Eng.), Professor, antennas and radio transmitters department, Institute of Technology of South Federal University, Taganrog
M. V. Orda-Zhigulina - Ph.D. (Eng.), Associate Professor, antennas and radio transmitters department, Institute of Technology of South Federal University, Taganrog. E-mail: jigulina@mail.ru