V. N. Seleznev - Post-graduate Student, Department of Radio Devices and Antenna Systems, NRU "MPEI" I. V. Belkovich - Post-graduate Student, Department of Radio Devices and Antenna Systems, NRU "MPEI" B. L. Kogan - Dr.Sc. (Eng.), Professor, Department of Radio Devices and Antenna Systems, NRU "MPEI"