RT Journal Article ID 155002b16a86756a A1 Ivanchenko, I. V. A1 Popenko, N. A. A1 Khruslov, M. M. T1 DIFFRACTION EFFECTS IN CYLINDRICAL MONOPOLE AND DIELECTRIC DISK ANTENNAS JF Radio Physics and Radio Astronomy JO RPRA YR 2012 FD 2012-08-13 VO 3 IS 3 SP 265 OP 271 K1 cylindrical monopole antenna K1 dielectric disk antenna K1 diffraction K1 interference AB Based on experimental studies and simulation modelling, the influence of diffraction effects on the radiation characteristics of cylindrical monopole antennas and dielectric disk antennas is determined under conditions when the electrodynamic parameters of antenna components are changed. In particular it is established that the oscillating dependence of the angle of maximum radiation and the resonant frequency of cylindrical monopole antennas with the monopole height dr1 = λ/4 as function of the ground plane radius are explained by the different spatial structure of electromagnetic field in the inductive region of the antenna with the ground plane radius multiple of λ/2 and of odd number of times λ/4 (λ is the wavelength in free space). It is shown that the spatial distributions of electromagnetic fields as the "spatial wave grating" are formed in the inductive region of antennas under test. PB Begell House LK https://www.dl.begellhouse.com/journals/6fd1549c0e2c05da,4e9409a35a49a927,155002b16a86756a.html