S.N. Razinkov – Dr.Sc.(Phys.-Math.), Senior Research Scientist, Leading Research Scientist, 

Radio-Electronic Struggle RTC of MESC «Zhukovsky–Gagarin Air Force Academy» (Voronezh)

E-mail: razinkovsergey@rambler.ru

D.N. Borisov – Ph.D.(Eng.), Associate Professor, 

Department of Radio Engineering and Antenna-Feeder Devices, MESC «Zhukovsky–Gagarin Air Force Academy» (Voronezh)

E-mail: borisov@sc.vsu.ru

A.V. Bogoslovsky – Ph.D.(Eng.), Senior Lecturer, 

Department of Radio Electronics, MESC «Zhukovsky–Gagarin Air Force Academy» (Voronezh)

E-mail: bogosandrej@yandex.ru

Electro-dynamic models were built using the induced current method to calculate the fields of the object with axial symmetry and the principle of equivalence of the field of the elementary electric vibrator and the current of the Hertz dipole and analysis of the arrays of elementary electric vibrators located on the side surface of the perfectly conducting cylinder of finite length was carried out. Beam patterns and coefficients of directional action of linear grids located along cylinder, grids located on circumference of its cross-section, ring grids, adjacent elements of which are at equal distance, are examined. Antenna arrays of the first and second types have significant directional action coefficients and capabilities of directional patterns control due to amplitude-phase correction of current of elements without application of complex switching devices. Arrays of the third type allow scanning of space in azimuth plane within 360° with preservation of high coefficients of directed action. Representation of bearing structure in the form of side surface of round cylinder of finite length is useful in analysis of electromagnetic field of fuselage of small-size aircraft of aircraft type.

The characteristics of the antenna arrays were determined on the basis of asymptotic estimates of the total electric field of the vibrator system and the cylinder in the far zone. The polarizing components of the magnetic and electric fields on the side surface of the cylinder were represented by equivalent currents approximated by rows of cylindrical functions; Lattice fields in the far zone of the cylinder were by summing up rows of trigonometric functions of azimuth harmonics of its equivalent currents with weight coefficients in the form of ratios of Hankel functions. It is shown that rows of azimuth harmonics of the cylinder side surface currents are characterized by fast convergence when its radius is of resonance area. They can be replaced by sequences composed of the first 5… 7 elements. The antenna array performance values were using a C computer program for a PC with an Intel Core i3-7020U processor and 4 GB RAM.

Regularities of change of directed properties of grids with different number of antenna elements and different versions of their arrangement on bearing surface have been investigated. It has been found that the greatest directivity values are achieved for the second type of lattice. The increase in the interelement distance in the first type of lattices within the wavelength does not result in a significant change in the directional effect factor. In order to increase the directional action factor of the third type of antenna array, its elements must be arranged so that their largest number is removed from the edge of the cylinder. At that, influence of currents reflected from edge of bearing surface on distribution of antenna elements currents is reduced.

In order to verify the accuracy of the calculations performed, a comparison of the grating patterns with the results obtained using the CST MWS - Computer Simulation Technology Microwave Studio electro-dynamic simulation package was carried out. The simulation used a personal computer with an Intel Core i7-8700 processor with 16 GB RAM. The beam forming time for each antenna array variant in the CST MWS packet was on the order of 5… 6 hours. Based on the results of the comparison, a qualitative match was found in the direction patterns of the arrays, including in the areas of interference minimums caused by the influence of the currents of the bearing surface.

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