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On the base of the uniform geometric diffraction theory method, using the asymptotical expression for a current of an impedance wire dipole located over a perfectly conducting plane, the fast active algorithms and programs are developed for computations of the directional and polarization characteristics of radiation produced by two synphasely excited crossed dipoles placed in parallel to a square...
Radiation fields of a radially oriented dipole located on a metal sphere coated with a thin layer of absorbing metamaterial are investigated. Numerical simulations were performed by using the electric Green's function for the space outside of an impedance sphere. An impedance of the metamaterial layer required to minimize the influence of the spherical scatterer with resonant dimensions upon the directivity...
Multiparametric energy characteristics of a T-shaped waveguide junction with a dielectric insert in a coupling slot area were numerically studied in the range of single-mode operation of the main rectangular waveguide based on the developed mathematical model. The end-wall of the side waveguide where the coupling slot were cut is supposed to be impedance. It was shown that the dielectric insert can...
The problem of electromagnetic wave excitation by a vibrators system with variable distributed surface impedance located in free space is solved by the generalized method of induced electromotive forces (EMF). The characteristics of three-element and multi-element Yagi-Uda antennas with variable impedance vibrators are calculated.
The problem of electromagnetic waves radiation by a longitudinal slot in the broad wall of a rectangular waveguide is solved. The slot is radiating into half space above a perfectly conducting plane in the presence of two passive vibrators (monopoles) having variable distributed surface impedance in the space above the plane.
A problem of electromagnetic waves scattering and radiation by a structure consisting of two asymmetrical vibrators (monopoles) with variable surface impedance allocated in a rectangular waveguide and a narrow transverse slot cut in a broad wall of the waveguide is solved by the generalized method of induced electro-magneto-motive forces (EMMF). Wavelength dependencies of energy characteristics of...
A problem of electromagnetic waves excitation by a structure, consisting of a narrow transverse slot in a broad wall of a rectangular waveguide and a vibrator with variable surface impedance, located inside the waveguide, is solved by the generalized method of induced electro-magneto-motive forces. Conditions, necessary for achievement of maximal slot radiation coefficient are defined. Calculated...
The dual-band circular-disk microstrip antenna is investigated. The possibility of main eigenwave of microstrip (the T-mode) transformation into surface mode theoretically is shown. The frequency bands of effective transformation experimentally are established. The counter lines of field structures are presented. The pattern characteristics are investigated.
The results of experimental investigations of the characteristics of a disk radiator with single radial slot discontinuity. The experimental results in the form of pattern characteristics, ellipticity coefficient and VSWR allow stating that this structure is a multiband antenna with quasi-circular polarization.
The electrodynamic characteristics of electrically long slot radiators in the narrow wall of a multimode rectangular waveguide have been investigated by the Galerkin's method. The multi-frequency radiator, based on this structure, has been realized at excitation of the waveguide by several modes.
The results of experimental investigations of the characteristics of hybrid metal-dielectric structures, which based on a combination of an inverted dielectric waveguide, a segment of a microstrip line and slot discontinuity are observed. The results allow predicting radiating structures designing with high level parameters and good agreement with external circuits as well.
The results of the experimental investigations of the single Ku-band radiator based on inverted strip dielectric waveguide are presented. The basic waveguide structure has a few advantages in comparing with other structures in Ku-band. The main of them is an ability of auxiliary elements arrangement. The investigating structure uses exactly this property. The radiator is a combination of two strip...
The problem about radiation of electromagnetic waves by the thin vibrator with the symmetrical and antisymmetrical components of the surface impedance relative to its centre, where the point source of excitation is located, has been solved by the generalized method of induced electromotive forces. The analytical expressions, obtained in a closed form, allow to obtain the current distribution along...
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