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Antenna array Complex directional antenna consists of separate near-omnidirectional antennas (radiating elements) positioned in the space and driven by high-frequency … (from 'Glossary' of our website) |
Archives for 2005Finding the maximum working bank for radiatorsThe equation for the maximum working bank and coordination level, dependent on the electrical size of some ideal according to the Chu and Harrington criteria antenna is reduced. The characteristics of coordination is assumed to be rectangular and the contact ration can be arbitrary. The received equation expresses the limit of the Chu–Harrington limit for the relative line, coordination level and electrical ... Modified: 12/29/2005 Tags: radiator , antenna , equation , Chu , Harrington Path: Home / Publications / Archives / 2005 / Finding the … About the measurement inaccuracies of dispersion diagrams in Fresnel zoneThe 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 / 2005 / About the … About the inaccuracy of measuring the directivity factor and directional diagrams of antennas at a short distanceThe 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 / 2005 / About the … About computing the characteristics of radiation of pyramidal horn antennas ... 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 / 2005 / About computing … Computing the electrodynamical characteristics of horn antennas ... 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 / 2005 / Computing the … Scattering of electromagnetic waves by mirror antennasScattering 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 / 2005 / Scattering of electromagnetic … The limit value of the directivity factor of the antenna located in a lossy mediumIt 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 / 2005 / The limit … About minimizing the integral diameter of dispersion of aperture antennasThe 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 / 2005 / About minimizing … Lens antenna based on a homogenous dielectric sphere: characteristics and potentialityResearche 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 / 2005 / Lens antenna … Restoring the antenna directional diagram using the Fresnel zone measurements on a measurement stand in a far zoneThe 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 / 2005 / Restoring the … Scattering of electromagnetic waves by antennas (overview)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 / 2005 / Scattering of electromagnetic … About the maximum power that is drown by the antenna in a lossy mediumIt is proved that when the primary incident field in a lossy medium is fixed, the power drawn by the antenna is finite. It is not necessary to limit the direction of the receiving antenna, unlike the case of a lossless medium when this is required to get a finite maximum.
The formulas for deriving the maximum received power and the optimal distribution ... Modified: 12/09/2005 Tags: power , antenna , field , mode Path: Home / Publications / Archives / 2005 / About the … About the power, drawn by the receiving antenna from the incident fieldAre received various variants of formulas for computing the power, received by the receiver, which take into account the discrepancy between the ends of the feeder path, when the form of the incident wave is arbitrary. In the special case where the receiver is completely concordant with the path, one of them grades into the Burstein-Kinber formula.
For different additional conditions, the high bound of the received power is determined and the optimal distributions of the field that make this power... Modified: 12/08/2005 Tags: power , antenna , feeder , wave Path: Home / Publications / Archives / 2005 / About the … Sorted by relevance / Sort by date Back to the list |
Latest Publications GuidesArray Coaxial 0.1.2 GuidesArray Coaxial™ is used by engineers for projecting and exploring the characteristics of two-dimensional periodic phased antenna arrays for coaxial waveguides. Latest News |
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