Definition of the radiation phase center by the field distribution
Аuthors
,
e-mail: anyutinnv@mail.ru
Abstract
In the article the definition of the radiation phase center as the center of a spherical wave with a uniform phase distribution in the far filed, which is contradictory from the point of view of electrodynamics, is discussed. This contradiction manifests itself in the essential value of the definitional measurement uncertainty, for the evaluation of which a method was proposed that naturally follows from the definition phase center. The method for evaluation the definitional measurement uncertainty of the radiation phase center was successfully validated on the model of the electromagnetic field of two Huygens' sources.
Based on the classical definition of the radiation phase center and the scalar plane wave expansion of wave field in the entire space, an equivalent definition of the radiation phase center was given. The phase center coincides with the point in the volume with the wave field sources, at which the modulus of the Kirchhoff's integral reaches its maximum. From this equivalent definition follows a new measurement method for the radiation phase center by the maximum of the field distribution, which was successfully validated on a series of experiments on measuring the electric field strength of a spiral antenna with right hand circular polarization on a spherical surface in the near field.
The type A evaluation of measurement uncertainty of radiation phase center using the weighted least squares method turned out to be comparable with the proposed evaluations of the definitional uncertainty, which indicates the prevalence of the latter in the uncertainty budget. Validating the measurement method for the radiation phase center by the maximum of the field distribution and the weighted least squares method on the same experimental data showed that the relative uncertainty of the first method is less by at least 2 times. Taking into account the entire uncertainty budget, this means that the methodical measurement uncertainty of the radiation phase center by the maximum of the field distribution has decreased by more than 2 times.
Keywords:
phase center, definitional uncertainty, plane waves, Kirchhoff’s integral, near field, far field, radiation patternReferences
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