Numerical Green's Function (NGF)
In the solution of large electromagnetic problems solved using the method of moments (MoM), it often happens that a considerable part of the geometry remains the same or static, while only a small part changes. The static interaction matrix can be saved to a .ngf file and reused to reduce CPU time.
Tip: To obtain a reduction in CPU time, domain decomposition is recommended for MoM
models consisting of a large static part and a smaller dynamic part.
A static part is
indicated by the
icon in the model tree.The following restrictions apply with respect to NGF:
- NGF can only be activated on a part. Selecting a sub-part and activating the NGF will activate the NGF for the entire part.
- NGF is not supported in conjunction with continuous frequency simulations.
- When NGF is activated for a part, the following cannot be modified
- geometry
- the solution method
- media
- ports added or deleted
- load
- transmission lines
- general networks