R.O. But – Engineer, 

JSC «Typhoon» (Kaluga)

E-mail: madara_40_rus@mail.ru

N.V. Samburov – Head of Laboratory «Antenna Measurements and UHF Technics», 

JSC «Typhoon» (Kaluga)

E-mail: samburov.n.v@yandex.ru

The article deals with general terms of the matching the emitters in the dipole-based antenna array. The advantages of the symmetric dipoles include their structural simplicity and satisfactory coordination with the transmission lines of standard wave impedances. However, the use of dipole arrays in wide-angle and wide-band applications leads to a number of technical limitations, such as limited broadband, limited sector of unidirectional radiation in the frequency band, the appearance of the "blinding" of the lattice in individual scanning sectors. A diagram describing the relationship of design features and technical characteristics for FAA based on vibrator radiators is provided.

A number of ways of matching the FAA, "active", "passive", as well as a method based on the use of controlled matching devices in the circuits of diagramming are considered. A mathematical expression describing the problems of the angular-frequency passive matching of an infinite lattice of symmetric vibrators with a small interconnection is presented.

A method for expanding the frequency band, based on reducing the mutual coupling by giving the reflector a shape other than flat is proposed. The use of a complex-shaped reflector can significantly improve the performance characteristics of the FAA (expand the scanning sector, increase the frequency band) by preventing the influence of reflector currents induced by a dipole on currents in the arms of neighboring dipoles. This effect is confirmed by the results of modeling a quasi-infinite lattice with structural elements of passive matching on the reflector and without them. For this, the “Floquet cell” method was used, which was implemented in the Ansoft HFSS electrodynamic modeling program.

Known methods of matching emitters in the composition of the antenna array can be divided into “Active” and “passive” in terms of their use for the purpose of reconciling the effects of mutual coupling between emitters.

In the case of passive reconciliation, this process should be carried out in two stages:

1. matching emitter in the frequency domain;
2. wide-angle matching of the radiator in the array (if necessary with multi-iteration adjustment in the frequency domain).

One of the compact broadband radiators is the radiator described in [2]. The study of this radiator as part of a quasi-infinite lattice with constructive elements of passive matching on the reflector and without them (fig. 3..5) demonstrated that when the EF reflector was introduced into the design, the frequency band of the antenna array in most scan angles increased, and the median value stabilized in all the studied scanning planes E, H and D.

Thus, the use of a complex-shaped reflector can significantly improve the performance of the antenna array: expand the scanning sector, increase the frequency band.

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