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The problem of sound propagation in a shallow sea with variable bottom slope is considered. The sound pressure field produced by a time-harmonic point source in such an inhomogeneous 3D waveguide is presented in the form of modal expansion. The equations for the modal amplitudes are uncoupled under the adiabaticity assumption. The mode parabolic equation theory is used to obtain an approximation for...
As is well known the development of high effective and thermostable acoustic devices assuming use of the acoustic waves with high coefficient of electromechanical coupling (K2) and low temperature coefficient of delay (TCD) is very important. At present there exist the papers showing that fundamental shear-horizontal (SH0) acoustic waves in thin (in comparison with wavelength) piezoelectric plates...
This paper proposes a novel design of a multiband fractal antenna of irregular shape using two-dimensional fractal clusters. The algorithm of generating fully reproducible fractal clusters is developed. The multiband behavior of the fractal-cluster based antennas is studied by means of numerical analysis. In comparison to regular-shaped fractal antennas more frequency bands and better matching are...
Radio absorption materials on the basis of polymeric technologies are designed. Considered in this paper are the absorption parameters of three types of the polymeric materials filled by metallic soft magnetic materials, which are broadly applicable in radio electronic equipment
The technology of making of metal-polymeric nanocomposites on the basis of the various polymeric matrixes was developed. The basic electrophysical characteristics of polythene-iron metal-polymeric nano-composites with content of iron nanoparticles up to 30 mass percents are investigated in various frequency ranges
The new design of multiband fractal antenna with irregular shape using two-dimensional pseudorandom fractal clusters is proposed. The multiband behavior of fractal-cluster based antennas is studied by means of numerical analysis. The spatial-frequency antenna characteristics are studied under feeding point displacements
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