Scaling Sources and Setting Delays for HFSS Transient Network
For HFSS Transient Network solutions you can separately edit sources for Spectral Fields and Transient Fields. The Transient tab on Edit Sources controls transient far fields and fields saved on the mesh. The Spectral Fields tab on Edit Sources controls Frequency domain far fields and antenna parameters.
- Editing Sources for Spectral Fields for Transient Network
- Editing Sources for Transient Fields for Transient Network
When non-port sources exist, the port post processing effects are off. For both Spectral and Transient fields, you can scale the sources individually through the source table in the Edit Sources dialog box, or you can Save to File or Load From File, using the .csv format or tab delimited data (.txt) format. This feature can help for projects with many sources. The linked steps describe how to directly edit the source table.
In Transient Network analysis each source is solved separately which allows arbitrary superposition of the results from all sources controlled by Edit Sources settings. This feature enables users great flexibility in studying a large set of excitation variations in an efficient and convenient manner.
When superposing results it is assumed that the fields have decayed to zero at the end of the simulation for each source. In practice, the user settings for Target Residual and time duration can cause this assumption to be violated. In this case the displayed field quantities may contain significant error.
For example, consider a design with two sources where the user has specified a large Target Residual setting, and one source converges at 1ns while the other converges at 2ns. If the user had not specified any time shifts in Edit Sources, the displayed field quantities will not be reliable in the range 1ns to 2ns because the fields from the first source cannot be assumed to be zero.