

Antenna array Complex directional antenna consists of separate nearomnidirectional antennas (radiating elements) positioned in the space and driven by highfrequency … (from 'Glossary' of our web–site) 
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Search on siteUse tags cloud or enter into field a search phrase and choose section of search. 1/ 2/ 3/ The measurement inaccuracies of dispersion diagrams of an arbitrary body in Fresnel zone that arise because of the finite distance between the body and the radiating antenna, and the body and the receiving antenna, as well as the directivity of the antennas are considered. The measurement inaccuracies of dispersion diagrams in the near zone of collimator in case when the boundary wave effect can be ignored are studied....
Modified: 12/28/2005
Tags: diagram , Fresnel zone , antenna , collimator Path: Home / Publications / Archives The first three terms of the asymptotic decomposition of the transfer ration between two antennas with arbitrary directional diagrams and polarization types are obtained. The formulas for the distance that can be used to measure primary and lateral radiation with the given inaccuracy are derived.
Radio engineering and electronics
Modified: 12/27/2005
Tags: directional diagram , antenna , asymptotic , polarization Path: Home / Publications / Archives ... characteristics of radiation of sharp pyramidal horns using aperture integrating when determining the field in a plane discontinuity point using approximating functions will be carried out. The calculation results are compared to the previous ones.
Antennas
Modified: 12/24/2005
Tags: pyramidal , horn , antenna , approximating function Path: Home / Publications / Archives ... electrodynamics for horn radiators with perfectly conducting plane flange, powered by cylindrical waveguides, is considered. The results of numerical calculations for the pyramidal and sectorial horns powered by the rectangular waveguide are provided.
Antennas
Modified: 12/23/2005
Tags: electrodynamic , horn , antenna , radiator Path: Home / Publications / Archives Scattering of a plane wave by mirror antennas with vibrating radiators is considered. The Fourier coefficients of the vector function equal to the current density on the mirror metal and the tangent component of the electrical vector on the geometric surface, complementing the surface of ...
Modified: 12/22/2005
Tags: scattering , electromagnetic wave , antenna , Fourier Path: Home / Publications / Archives It is shown that the directivity factor of the antenna located in a lossy medium is limited and its maximum value is finite.
Radio engineering and electronics
Modified: 12/21/2005
Tags: antenna , directivity factor Path: Home / Publications / Archives The formula that relates the integral diameter of the distance to the effective absorbing surface of the aperture receiving antenna is derived and using this formula, the conditions of minimizing the diameter and its value are found.
Radio engineering and electronics
Modified: 12/20/2005
Tags: dispersion , aperture , antenna , absorbing surface Path: Home / Publications / Archives Researche and optimization of characteristics of lens antennas based on a homogenous dielectric sphere, taking into account the aberration effects, reflections, dielectric losses, radiator directional diagrams, matching layers and technological tolerance are carried out; the relation of antenna characteristics ...
Modified: 12/16/2005
Tags: lens , antenna , dielectric , sphere , directional diagram Path: Home / Publications / Archives The method of determining the antenna directional diagram using the amplitude and phase measurements in the Fresnel zone is considered; the mathematical rationale of the method is given along with the results of computer and experimental modeling and the samples of using when measuring ...
Modified: 12/14/2005
Tags: antenna , directional diagram , Fresnel zone , measurement , far zone Path: Home / Publications / Archives This is given the overview of the known approximate methods of calculating the scattering of electromagnetic waves by antennas, including calculating the integral and differential surfaces of dispersion; simple formulas for estimating these values are given. In addition, some results that belong to the authors of the work are stated.
Radio engineering and electronics
Modified: 12/11/2005
Tags: electromagnetic wave , antenna , approximate Path: Home / Publications / Archives 1/ 2/ 3/ Sorted by relevance / Sort by date 
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