HFSS User Experience HFSS User Experience Similar to most large-scale numerical analysis software, Ansoft HFSS based on the finite element method is not a fool-proof software. For most problems, in order to obtain fast and accurate results, human intervention is necessary. In addition to being very clear about the details of the model, the modeler himself is also better to have a certain foundation in electromagnetic theory. It is assumed here that the reader has used HFSS, so some basic operations are not mentioned. 1. Use of symmetry For a specific high-frequency electromagnetic field simulation problem, you should first see if it can use symmetry surfaces. The constraints here are mainly in the requirements of geometric symmetry and excitation symmetry. If the excitation of a problem does not require to be changeable, such as an array with all in-phase feeds, it is best to use symmetry at this time, and even two symmetries (E and H symmetry) can be used, which will greatly save time and equipment resources. 2. Use of surfaces In practical problems, many structures can be replaced by 2D surfaces. The advantage of using 2D surfaces is that it can greatly reduce the amount of calculation and the results are almost the same as using 3D entities. For example, when calculating a microstrip branch line coupler, the microstrip and ground of the printed circuit board can specify certain surfaces as ideal electrical surfaces instead, so that the required physical size and performance can be quickly obtained. Taking the calculation of dipole as an example, if the dipole is a cylinder made of an ideal conductor, then under the same other conditions, its calculation time is about 4 to 5 times that of using an equivalent surface as a dipole. This is generally evident. 3. Use of Lump Port HFSS8 provides a new excitation: Lump Port. This excitation avoids the establishment of a coaxial or waveguide excitation, thereby reducing the model volume and calculation time to a certain extent. LumpPort can also be represented by a surface. It should be noted that the calibration line and impedance line of the Port must be set accurately, and the port must be connected to other metals (or electrical surfaces) in space, otherwise the result is very easy to make mistakes. 4. About the radiation boundary When there is no need to solve near (far) field problems, such as sealed problems such as filters sealed in metal boxes, there is no need to set radiation boundaries. When it is necessary to solve field distribution or directional patterns, radiation boundaries must be set. Here...
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