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Technical Notes

The simulation technique used to calculate the full 3D electromagnetic field inside a structure is based on the finite element method. Although its implementation is largely transparent, a general understanding of the method is useful in making the most effective use of HFSS.

The HFSS Technical Notes provide an overview of the finite element method and its implementation in HFSS. They also describe how modal S-parameters are computed from the simulated electric and magnetic fields and how they can be converted to "nodal" or "voltage" based pseudo-S-parameters used in circuit theory.

Information is included on the following:

• The Finite Element Method

• The HFSS Solution Process

• Domain Decomposition

• S-Parameters

• Radiated Fields

• Geometric Objects

• Boundaries

• Derivatives

• Integral Equation Method Used in HFSS-IE

• Transient Solution Theory

• Excitations

• Materials

• Best Practices for Accurate and Causal Broad Band Frequency Sweeps

• Parametric Analysis

• Sensitivity Analysis

• Tuning Analysis

• Modes to Terminals Conversion

• Large Scale DSO Theory

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