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Solved the problem of synthesis of an inhomogeneous anisotropic impedance plane reflecting a homogeneous plane wave in a given direction with the required polarization transformation. Obtained reflection coefficients for an inhomogeneous anisotropic impedance plane. Formulated constraints on the class of scattering diagrams realized with the help of a dense array of orthogonal reactant strips of constant...
Solved the problem of synthesizing an inhomogeneous anisotropic impedance plane reflecting a homogeneous plane wave in various preset directions on a coherent and cross polarization is solved. Formulated the restrictions on the class of scattering diagrams realized with the help of a dense array of orthogonal reactant strips of variable.
The paper analyzes the directed properties of antipodal Vivaldi antenna located on the faces of the wedge, coupled with the two cylinders — at the top and bottom. Two models of the antenna are examined. In the first model on each face of the wedge symmetrically with respect to the edge there is one antenna, in the second — two antennas. The comparative characterization of these antennas is performed...
This paper presents an analysis of the directional properties of Vivaldi antenna located on the faces of the metal wedge. Two models of the antenna were studied. In the first model is one antenna on each face symmetrically to the edge of the wedge, and in the second model — there are two antennas. The comparison of the characteristics of the antennas is done. The influence of a value of the angle...
This paper represents numerical and experimental studies of multimode waveguide Van-Atta array. It is shown that the use of multimode waveguides under certain conditions, allows to expand the angular sector of monostatic diagram of radar cross-section to the maximum possible value of ±450 relative to the normal to the plane of the array. Radiation pattern of the radiating elements in this case is...
A strictly stated synthesis problem of inhomogeneous stationary and quasi-stationary impedance planes, which reflects a homogeneous plane wave in the given direction at the required polarization with a frequency shift, is solved. The impedance distribution law is obtained in the explicit form. Restrictions on class of realizable scattering patterns for passive impedance are formulated; formulas for...
Reflection factors are obtained for the inhomogeneous impedance plane that re-reflects the incident plane wave in a specified direction at a required polarization with a necessary frequency shift. In the general case, planes of incidence and reflection do not coincide. Results of computation are given.
We consider three models of compact wideband microstrip antennas (MSA) with radome to operate in the frequency range 1.2 to 1.65 GHz. They are characterized by different forms of ring-radiating patch and a weak capacitive coupling with the feeder microstrip line. Each antenna has a suspended substrate FR4 with radiator patch and feed strip and a lower substrate FR4 with the microstrip line and broadband...
A strict stated synthesis problem of inhomogeneous stationary and quasi-stationary impedance planes is solved. The impedance planes reflect a homogeneous flat wave in the given direction at the required polarization with a frequency shift. The impedance distribution law is obtained in the explicit form. Restrictions on class of realizable scattering patterns for passive impedance are formulated. Formulas...
A rigorously stated synthesis problem of inhomogeneous stationary and quasi-stationary impedance planes, which reflect a homogeneous flat wave in the given direction at the required polarization with a frequency shift, is solved. The impedance distribution law is obtained in the explicit form. Restrictions on class of realizable scattering patterns for passive impedance are formulated; formulas for...
In this work, characteristics of ultra-wideband "Vivaldi" radiators in single use and also in array condition was investigated. One of the design features in this antenna is the original arousing detail, eliminating a resonator. There is a research about abilities of band enhancement using absorber. Significant bandwidth widening to the left of arrayed "Vivaldi" radiators in E-plane...
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