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This is a fairly common issue that pops up for me when using Ansoft HFSS (v14) or Q3D (v10) in Linux environment. I figured I'll post a thread showing how I fixed it in case it helps someone else.
If the error shows up, clear the main window by typing:
> mv ~/.mv ~/.mv_old
I found this useful...
I've never personally done this, but I'm pretty sure one issue you need to look into is to define the layer mapping from .gds/.dxf to .hfss during import. Have you done this?
The bulk resistivity of SiC can really be variable depending on the fabrication process. But a reasonable assumption would be values of 1e4 to 1e8 ohm-cm. It's a pretty isolating substrate anyway...
A word of caution regarding point 3.
Although it really depends on the inductance value you need, be aware that spiral inductors have low Q-values especially at 90 GHz. Make sure that it is okay for your application. Transmission line inductors or meandered line inductors may be better at these...
Hi,
I have noticed some issues in Ansoft Q3D's 2D Extractor and thought I'll put it up to see if others noticed something similar. Here's the situation:
I am trying to extract RLGC parameters of a transmission line for different substrate properties like loss tangent and substrate...
As already mentioned in this thread, if you renormalize your waveport impedance to 50 ohms, you make your driving port impedance independent of waveport size, substrate, and transmission line width. In this case, you can calculate the input impedance looking through one port by considering the...
Correct me if I'm wrong, but if you define the deembedding to be relative to the box wall (as in, the deembedding length is linked to a feature geometry), then resizing the geometry should move around the deembedding length as well. In this way, you will not have to resize the box. The problem...
Hi,
I am trying to simulate a microstrip line with 3um thickness, 50um width (Z0~85 ohms) and 1000um length on a substrate with various resistivities such as 1e3 ohms-cm to 1e6 ohms-cm using HFSS. I have used lumped ports and an airbox that is at least λ/4 at the lowest simulation frequency. I...
Hi Volker,
In the known bugs section on the sonnet website, there is an entry which says "Ports Attached to Thick Metal May Produce Inaccurate Response Data" (KB-ref: TT5552) and cites the cause as:
"When the de-embedding is done on the circuit, the calibration standards do not include the...
I'm not the best at antennas or modeling tissue, but from what I understand, fat/tissue is dispersive and nonisotropic. So your simulation accuracy depends on how well you define dielectric constant, dielectric loss tangent and conductivity of tissue as a function of direction and frequency...
For substrates that are isotropic (have properties the same in every direction), non-magnetic and non-dispersive (have properties independent of frequency) define:
Dielectric constant, Loss tangent, Conductivity
For nonisotropic materials, make sure you define the above parameters in every...
De-embedding does change the phase response due to shift of the reference plane. Since the waveguide itself exhibits very low losses, you will not see a significant change in the magnitude response.
However, generally speaking, the de-embedding process affects both magnitude and phase. Many...
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