Computational methods for modeling of complex sources

Abstract

Purpose

The purpose of this study is to develop and compare two methods of determining the total field, including phase information, when only field amplitudes have been measured on a set of planes in the near field of a complex electromagnetic source.

Design/methodology/approach

The first method is a gradient‐based optimization algorithm, based on the adjoint fields. The second method employs an optimization algorithm based on the phase angle gradients of a functional.

Findings

The first method, the adjoint field method, is functioning well for a 2D test case. The second method, the phase angle gradient method, gives very good results for 3D test cases.

Research limitations/implications

The next step is to test the methods with results from real measurement data.

Practical implications

The developed methods are intended for use in dosimetry studies and other applications, where the field distribution from electromagnetic sources are needed.

Originality/value

The methods extend previously made constant phase approximations. The present methods are useful in situations where the electromagnetic source is hard to model.

Citation

Johansson, M., Nord, L.E., Kopecký, R., Fhager, A. and Persson, M. (2008), "Computational methods for modeling of complex sources", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 27 No. 1, pp. 133-143. https://doi.org/10.1108/03321640810836708