Resumen de Computational methods for modeling of complex sources

Markus Johnsson, Lovisa E. Nord, Rudolf Kopecky, Andreas Fhager, Mikael Persson

• 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.