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

A.V. Fedorov – Post-graduate Student, MESC «Zhukovsky–Gagarin Air Force Academy» (Voronezh) E-mail: a.fyodoroff@mail.ru

On the basis of the numerical solution of Halen's integrated equations in approach of wire model Krylov-Bogolyubov's method the directional pattern of array of log-periodic dipole antenna excited by a flat monochromatic wave is investigated.

It is shown that at approximation of currents the sequences of piecewise and constant functions the strict solution of a marginal task for the antenna is by the partial address of the matrix of the generalized impedances and multiplication by a vector column of the equivalent potentials calculated in points of sampling of vibrators.

Regularities of change of active area and the directed properties of the antenna in the range of lengths of waves taking into account of electromagnetic interaction between the elements are revealed. Considerable amplitudes of currents are typical for elements of resonant length. For other vibrators the effect of an automatic cut-off of currents is observed. Narrowing of the direction characteristic of the log-periodic dipole antenna can be executed due to the increase in its period and reduction of an angle of an aperture leading to increase the number of elements in the fissile region of the antenna.

Width of the main beam of the directional pattern of the antenna which is switched on in structure of array practically doesn't change in comparison by width of the main petal of the directional pattern of the single log-periodic dipole antenna. Considerable changes of the directed properties are characteristic of area of side petals where mutual influence of vibrators of the largest sizes is rather big.

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