Journal ArticleDOI
Planar near-field to far-field transformation using an equivalent magnetic current approach
P. Petre,T.K. Sarkar +1 more
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In this article, an electric field integral equation (EFIE) is developed to relate the near fields to the equivalent magnetic currents, and the method of moments is used to transform the integral equation into a matrix one.Abstract:
An alternative method is presented for computing far-field antenna patterns from near-field measurements. The method utilizes the near-field data to determine equivalent magnetic current sources over a fictitious planar surface that encompasses the antenna, and these currents are used to ascertain the far fields. Under certain approximations, the currents should produce the correct far fields in all regions in front of the antenna regardless of the geometry over which the near-field measurements are made. An electric field integral equation (EFIE) is developed to relate the near fields to the equivalent magnetic currents. The method of moments is used to transform the integral equation into a matrix one. The matrix equation is solved with the conjugate gradient method, and in the case of a rectangular matrix, a least-squares solution for the currents is found without explicitly computing the normal form of the equation. Near-field to far-field transformation for planar scanning may be efficiently performed under certain conditions. Numerical results are presented for several antenna configurations. >read more
Citations
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Journal ArticleDOI
Near-field to near/far-field transformation for arbitrary near-field geometry utilizing an equivalent electric current and MoM
Tapan K. Sarkar,A. Taaghol +1 more
TL;DR: In this article, a method for computing near and far-field patterns of an antenna from its near-field measurements taken over an arbitrarily shaped geometry is presented, where the measured data need not satisfy the Nyquist sampling criteria and an electric field integral equation is developed to relate the near field to the equivalent electric current.
Journal ArticleDOI
Reconstruction of Equivalent Currents Distribution Over Arbitrary Three-Dimensional Surfaces Based on Integral Equation Algorithms
TL;DR: In this article, a technique for the determination of the equivalent currents distribution from a known radiated field is described, based on the representation of the radiating structure by means of a set of equivalent currents over a 3D surface that can be fitted to the arbitrary geometry of the antenna.
Journal ArticleDOI
Modeling Magnetic Radiations of Electronic Circuits Using Near-Field Scanning Method
TL;DR: In this paper, a simple method to obtain the equivalent radiation emitting sources of an electronic circuit using the near-field scanning method is presented, which is based on a set of elemental dipoles that substitutes the electronic circuit and radiates the same magnetic field.
Journal ArticleDOI
Field And Source Equivalence In Source Reconstruction On 3D Surfaces
TL;DR: In this paper, the equivalence principle is applied to the inverse-source problem, where equivalent sources and/or flelds are computed on an arbitrary 3D closed surface from the knowledge of complex vector electric fleld data at a specifled (exterior) surface.
Journal ArticleDOI
Improved-Accuracy Source Reconstruction on Arbitrary 3-D Surfaces
TL;DR: In this paper, a dual integral-equation formulation of the source reconstruction problem on arbitrary three-dimensional (3D) surfaces based on integral equations is presented. But the authors do not consider the problem of source reconstruction on arbitrary 3D surfaces, and they use boundary integral field identities to enforce that the unknown currents are Maxwellian on the reconstruction surface.
References
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Book
Field computation by moment methods
TL;DR: This first book to explore the computation of electromagnetic fields by the most popular method for the numerical solution to electromagnetic field problems presents a unified approach to moment methods by employing the concepts of linear spaces and functional analysis.
Journal ArticleDOI
An overview of near-field antenna measurements
TL;DR: In this paper, a brief history of near-field antenna measurements with and without probe correction is outlined, beginning with ideal probe scanning on arbitrary surfaces and ending with arbitrary probes scanning on planar, cylindrical, and spherical surfaces.
Journal ArticleDOI
Comments on "Application of FFT and the conjugate gradient method for the solution of electromagnetic radiation from electrically large and small conducting bodies"
TL;DR: In this paper, Sarkar et al. describe how the fast Fourier transform (FFT) and conjugate gradient method (CGM) can be used to efficiently make use of the convolutional form of the electric field integral equation for straight wire antennas.
Journal ArticleDOI
Error analysis techniques for planar near-field measurements
TL;DR: A combination of techniques is described for reliably estimating the magnitude of each error arising in planar near-field measurements, which include mathematical analysis, computer simulation, and measurement tests.
Journal ArticleDOI
Basic theory of probe-compensated near-field measurements
TL;DR: In this article, the application of the Lorentz reciprocity theorem to the problem of determining antenna characteristics, including the far-field pattern, is presented and the data required to correct for the directional effects of the probe, the effect of probe correction on the measured data, and the attendant mathematical computations in rectangular systems are described.
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Near-field to near/far-field transformation for arbitrary near-field geometry utilizing an equivalent electric current and MoM
Tapan K. Sarkar,A. Taaghol +1 more