Computational methods for modeling of complex sources
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.
electromagnetism optimization techniques electric fields