Vol 16, No 1 (2013)

The propagation of a magnetostatic gap wave in a gap between two ferromagnetic with opposite longitudinal magnetizations is considered under the conditions for relative longitudinal displacement. It is shown that the view of dispersive dependences of a high-frequency and low-frequency modes of magnetostatic gap waves is considerably modified because of displacement of one of a crystals. At the same time the magnetic field of high-frequency mode in the gap displays «sensitivity» to relative longitudinal displacement of a crystals.

This paper describes the destructive effects of both external and internal feedback on the convergence of the iterative process for finding the Volterra kernels in strongly nonlinear electronic circuits. There is investigated the location of the critical points at which the system loses its analytical properties, and Volterra series begin to diverge. In some cases the critical points for the Volterra series lie in the deep nonlinear region, in other cases these points are directly adjacent to the weakly nonlinear mode. It is found that the failure of the iterative process occurs at the negative and positive feedback, but the latter one limits the convergence radius much more.

Consider the results of the numerical experiment to study the passage of fractional pulse through a single-mode optical fiber with the chromatic dispersion. Along with the desired signal transmitted masking noise signal. It is shown that for effective cleaning of the fractal signal from the noise at the output of the fiber-optic link is necessary along with the code to know the fractal signal dispersion coefficient of the optical fiber.

In conjunction with the problem of the target selection on a clutter background with quasi-continuous radiation, the analysis of the spatial radar signal processing is made. The analysis is made for a case of non-isotropic array elements. The calculation results of the optimized receiving antenna pattern and the attained signal-to-noise ratio for the confirmation of the efficiency of the cylindrical array system with the azimuth scanning rate increase are given.

A generalized model of the coupled slow-wave structures (CSWS) formed by placed in parallel or coaxially impedance conductors, had been considered. Substituting obtained equivalent parameters in the «truncated» long-line dispersion equation made it possible deriving a dispersion equation and an expression for the opposite phase wave slowing down. It follows from the obtained relations that independently on the specific configuration of the impedance conductors, slowing of the opposite-phase wave in the CSWS may exceed many times slowing in one impedance conductor while saving a large enough wave impedance and a small loss in the conductors. It has been shown that the electric field energy concentration between impedance conductors and the magnetic field energy concentration outside conductors provides the significant increase in the effectiveness of RF heating and measuring providing the possibility of developing novel technologies and devices for industrial and medical applications.

Using the developed method for finding a solution to the dispersion equation for E_00 wave (Sommerfeld wave) in a cylindrical conductor of large radius with finite conductivity the dependences of phase coefficient and attenuation coefficient on frequency (f <= MHz) are calculated for the cylinder with radius of the Earth and material parameters of sea water (sigma_1 = (1–5) (Ohm m)^-1).

The computed and measured characteristics a protector devices for UHF-set are presented. In these devices have been used pin-diodes with different base, also «similar-teristor». The analyzed and measured results has proven to be an efficient tool in design on microwave devices.