E. V. Manaenkov – Head of Department,

JSC Central Design Bureau of Apparatus Engineering (Tula)

E-mail: evm_74@mail.ru

Currently, it is urgent to develop Ka-band antennas with electric scanning designed to track targets in the immediate vicinity of the ground-based radar station on which they are installed. The main requirements for such antennas are high accuracy of zero setting of the difference radiation pattern (direction of bearing is not worse than several angular minutes) and small overall dimensions (about 10). One of the possible variants for constructing an antenna that meets the specified requirements is a phased array antenna of the feedthrough type.

The goal of the article is to determine the contribution of errors of various types to the total error in the beam forming of the antenna array under consideration by comparing the results of the experimentally measured characteristics of the prototype of the feedthrough phased array with theoretical estimates.

In the work the technical characteristics of the antenna in the form of a feedthrough phased array have been presented. On the basis of experimental and theoretical data, a comparative analysis of the accuracy of beam setting of the sum radiation pattern and the zeros of the difference radiation patterns has been performed.

The conducted studies made it possible to determine the relationships for calculating the values of the deterministic and random errors of setting of the differential pattern zero in the scanning phased arrays of Ka-band. Deterministic errors can be taken into account using correction curves that depend on the ratio of the maxima of the difference directional patterns and possible edge effects. For random errors, it is possible to determine the limits of deterioration of the accuracy of the beam setting, which in this case are determined by the magnitude of the standard deviation 8.5. The results presented in the article show that, taking into account the introduction of correction dependences, it is possible to increase the accuracy of the beam installation up to 1/50 of the beam width. A further increase in direction finding accuracy requires both increasing the level of technology in the manufacture of integrated phase shifter emitters and improving the process of assembling, tuning and measuring the phased arrays and its individual elements. Based on the results of the analytical processing of the experimental data, conclusions and recommendations have been formulated to ensure the given accuracy of direction finding using the considered antenna.

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