Learning Forum

[Jason.k]

Hello Sghose, 

Thank you for reaching out to Ansys Learning Forum. 

Indeed, it is possible to do Transient Analysis and of course Frequency Domain Simulations using Ansys HFSS. 

Hidden in the documentation you may find the answer regarding Transient Analysis & The requirements that the materials need to meet for this type of Analysis.

To be more specific, Materials for transient solutions must meet these requirements:

• Materials cannot have arbitrary frequency dependence in a time-domain analysis. For lossy dielectrics, a Debye model is applied to ensure that the loss remain physical across the spectrum. For lossy metals, a Padé approximation is used for the same reason.
• When lossy materials touch a port, the port solver will launch an excitation that fits the lossless case. This is inherent to most time-domain solvers. The 3D part of the simulation will take losses into account correctly.
• Spatially dependent material properties can be specified through user-defined variables in HFSS. Spatially dependent materials are usually applied for modeling dielectric lens, dielectric waveguides, substrates with graded doping profiles, and graded-index fibers.

More information can be drawn by looking into HFSS Help documentation>HFSS Transient. 

I hope this helps! 😄

Have a nice rest of the day, 
Kind regards, 
Jason.