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HFSS15: Ports and Edit Sources Behavior for Transient Network
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Transient Network solutions support the following port features:
• Just as in Driven Terminal we have two types of ports namely wave ports and lumped ports.
• Both port types are restricted to be single TEM terminal ports such as coax and gap ports.
• Waveports are matched loaded.
• Lumped ports are loaded with the user defined "Full Port Impedance".
• Both ports support renormalization of the spectral quantities S-parameters and far fields including antenna parameters.
• Neither port supports renormalization of transient quantities.
Edit Sources for Transient Network involves specifying the incident voltages at the terminals of the ports not the total voltages. This means that all ports are terminated with the port settings and if the edit source for a given port is set to zero it means that port is loaded with the port setting and it does not imply a short. As mentioned above, transient fields are not affected by any renormalization but the frequency domain far fields and antenna parameters are affected by renormalization.
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.
Note | 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 . |
For HFSS Transient, Edit Sources is disabled.
