... several octaves and the operating azimuth comparable to a hemisphere. Antenna arrays based on such known principles as waveguide, vibrator, microstrip and so on do not meet the specified requirements and cannot meet them in principle. The heuristic analysis of the problem shows that it can be solved on the following premises: — The array is based on a periodic structure with its inputs interacting before radiation goes to a free space. — The field pattern in the cross-section of the structure ...

Approach for the analysis and Q–factor estimates of patch antennas with artificial dielectrics substrates for decimeter and larger wavelengths have been considered. Parameters range not leading to significant normal dispersion have been estimated and treated. Also ...

The infinite array of stepped plane-parallel waveguides with dielectric inserts and projected dielectric elements, excited by TEM-waves is analyzed in this article using the integral equation for electric field (polarization current) in the projected element and field linking method in the horn; the differential equation is solved using the Galerkin method using vector waves of the corresponding resonator as basis and weight functions; numerical results characterizing the suggested algorithm and...

The article expresses the conditions that must be met when measuring the radio-locating cross-section of a target in terms of amplitude and incident field phase variation. A number of minimal distance criteria are examined. The analysis of minimal distance for the cases when the antenna has a uniformly lighted square aperture is given, and the relation that binds the minimal distance to the sensitivity of measurements. The measurements of the reflection properties of small targets ...