S.V. Zimina

Directivities of adaptive antenna arrays adjusted by the discrete gradient algorithm, the algorithm of recurrent inversion of the sampling estimate of input signals correlation matrix, and the Hebb algorithm, taking into account adjusted weight vector fluctuations and accepting wideband signals, are considered. The arrays were supposed both containing and not containing a nonlinear function in the correlation feedback circuit. Two variants were considered. In the first case, the narrowband adaptive antenna array accepts wideband signals, and in the second case the wideband adaptive antenna array accepts wideband signals. It was shown that directivity shapes depend on a type of the algorithms and on presence (or absence) of nonlinear function in the correlation feedback circuit. It was noted that fluctuations of weight coefficients increase directivity values, but simultaneously they distort directivity shapes with respect to the angle of incidence of a test signal.