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Effect of the reconfigurable frequency selective surface (FSS) with capacitive microelectromechanical (MEMS) switches on characteristics of a scanning and radar cross section (RCS) of the phased array (PA) of the open ends of rectangular waveguides is investigated. It is shown that in a case of switching on MEMS the FSS transmits a far field of PA and the return losses is less than minus 10 dB in...
In the paper on the basis of the finite-element method the possibility to create a broadband polarizer in an aperture of an antenna array for operation in a sector of scan angles of ±45° and more is shown. The calculations of angle responses and radiation patterns of the developed model of a broadband four-grid 45° rotator of polarization are given in a sector of scan angles of a ±60° in two planes...
The problem of scattering of plane electromagnetic wave on the infinite microstrip lattice with nonlinear loads in the strip plane was solved when a metamaterial (MM) is used as lattice substrate. It is shown that an application of MM as a substrate (instead of a dielectric) provides alignment of levels of the higher harmonics in comparison with first harmonic in the reflected field. It is reached...
A model of broadband reflection-type polarizer providing the twist-effect for the reflected linearly polarized electromagnetic wave is proposed. The polarizer consists of the metallic ground, two plane-parallel layers and a dense grid of thin conductors placed between layers. The task solution was formulated as a system of two transcendental equations which, in general, must be solved numerically...
The two-dimensional problem of synthesis of the reflector of arbitrary shape, excited by a system of distributed irradiators is solved. The distribution law of impedance in an explicit form is obtained. The results of numerical studies for two-dimensional and three-dimensional surfaces in the package Ansoft HFSS are given.
The paper presents results of Van Atta Array scattering characteristics research. The research was done for an array consisted of a set of parallel-plate waveguides with apertures located on the same plane for two different configurations: 1) the apertures are separated with impedance flange (Figure 1) and 2) the apertures are separated with semi-infinite parallel-plate waveguides - excited waves...
This paper is devoted to the analysis of the scattering characteristics of Cassegrainian antennas widely used for onboard radio engineering systems. The scattering characteristics of two-dimensional and three-dimensional models of three Cassegrainian two-mirror antenna designs are considered in the paper.
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