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HFSS and Planar EM Simulators > Planar Setup: Solver TabClick the Solver tab of the Add Planar EM Solution Setup dialog to access the following settings. ![[spacer]](1p.gif){kind=small}
 • General options: • Use loop tree: the Moment Method basis functions are re-organized to provide low frequency solution accuracy and stability. • Accuracy level: determines the level of precision of various computations in the simulation procedure. The default solution accuracy level is level 2, the usual recommended level. For very large solutions, accuracy level 1 is recommended. For more information see Setting the Solution Accuracy Level. • Specialized design type: — Generic: no special treatment by the engine. — Spiral Inductor: the engine treats the currents on zero thickness metals as a volume current; the current on the vias simply transfers from one end to the other without consideration to the wire. • Modelling Options: • Signal layers thinner than <value> are modeled as zero thickness: metal signal layers in the design which are thinner than the given value are modeled as being infinitely thin in order to reduce simulation time. • Dielectrics thinner than <value> are merged with an adjacent: dielectric layers in the design which are thinner than the given value are merged into an adjacent dielectric; material properties are accumulated using a weighted average. • Solver type selection: determines what matrix solver is used, based on the number of unknowns. • Direct solver: use the direct matrix solver. • Iterative solver: GMRES type matrix solver. • Ansoft MoM Fast Solver™: the Ansoft "method of moments" technology that is used to solve especially large matrix equations.
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