Matsaienko A. Methods of development of antenna-feeder devices based on low-emitters over a cylindrical surface

Research object: antennas devices of the base stations of the systems of mobile radio contact. Purpose of work: an increase of efficiency of aerial devices of the base stations of the systems of mobile radio contact is due to the use of low-profile emitters above a cylinder surface. Research methods: numeral analytical methods of the applied electrodynamics; combination of electrodynamic analysis and theory of electric circles; methods of theory of diffraction are on the bodies of regular shape, design methods on PС. Theoretical and practical results and novelty: The mathematical model of low-profile emitter is improved on-the-spot infinitely long metallic a cylinder with the permanent constituent of the electric field on a crack which is the decision of task about finding of the field of radiation of LPE on the infinitely long cylinder screen. Got a mathematical model characterizes distributing of the electromagnetic field in a distant area (separately for vertical and horizontal polarization). The diagrams of orientation are built and found out dependence of width of PD on correlation of a/?. The difference of the offered model from existing consists in that at the calculation of the field of LPE there was the used condition of constancy tangent of constituent of the electric field in розкриві of radiative crack. The results of calculations make basis of method of calculation of low-profile aerials above a cylinder surface. The proper diagrams of orientation are presented after the got analytical expressions which allow to expect circular (arc) arrays on the basis of low-profile emitters. The method of calculation of antenna the difference of the offered method from existing consists in that a calculation directly of aerial is carried out on the basis of analytical expressions, got on condition of constancy of the electric field in розкриві of radiative crack and on the basis of aperture model of the radiative system. An effect from application of this method consists in possibility of creation of antena will build on with wide functional possibilities in relation to forming of PD of different configuration from omniaxis to sectoral due to variation of electric radius of the system. The got results rotined that created by the developed method of LPE above a cylinder surface on 10-15% is more effective than the known standards on such indexes as a coefficient of unevenness, mass, sizes, wind loading. Degree of introduction: NTUU "KPI" in the educational course of discipline the "Antenas devices"; during implementation of NDR of " Укрспецтехника" and LTD." Мікрохвиля ". Industry is engineering sciences, telecommunications