MLFMM Settings

A number of optional settings are available when using multilevel fast multipole method (MLFMM to solve a model.

Note: It is recommended to use the default settings. Setting any of the advanced settings can have significant consequences both in accuracy and run time.
Activate additional stabilisation for the MLFMM
Select this option to activate additional stabilisation for a model with severe convergence problems.
Field calculation methods
Near-field
The MLFMM method can use a fast near field calculation method (default), but under certain circumstances, it is preferred to use the traditional integration method.
Far field
The MLFMM method can use a fast far field calculation method (default), but under certain circumstances it is preferred to use the traditional integration method.
Box size at finest level
The MLFMM is based on a hierarchical tree-based grouping algorithm and depending on the frequency and the model dimensions, the Solver automatically determines the number of levels in this tree and the size of the boxes at the finest level
This option allows you to try to obtain convergence by increasing or decreasing the box size. The box size is specified in terms of the wavelength.
Tip: A starting point of 0.23 is recommended. Values should not be less than 0.20.