Learning Forum

[gvirbila]

What's the good choice for the adaptive solution? I am designing hybrid couplers at 94GHz. I have been using the Broadband solution from 90GHz to 100GHz as I am interested in the neighborhood as well. What would provide the most accurate results? 

[Praneeth]

Hi,

Thank you for reaching out to the Ansys Learning Forum.

Please note that the broadband analysis provides the advantage of adaptive meshing based on multiple frequency points. This mesh still holds good for calculating the response in the adjacent frequency bands as well. You can simply use an interpolating sweep to analyze the model for the required frequency band adjacent to the solution frequency. 

It is recommended to use the highest frequency of operation as the adaptive frequency with single solution option as this mesh will be valid for lower frequencies in the band of interest. However, the simulation resources will increase for higher frequencies as the mesh would be finer.

You can also extend the frequency band in broadband analysis if required.

Best regards,
Praneeth.
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[gvirbila]

Which solution provides the most accurate results? Like I mentioned in my original post, I am interested in the 90-100GHz band but particularly 94GHz. Should I be setting the single tone solution to higher than 100GHz?

Can you provide any documation to learn a little more about the set up for the solver?

[Praneeth]

Hi,

The accuracy will be siimilar if you use single or broadband adaptive frequency. The adaptive meshing ensures a good quality mesh either way. 

The accuracy will depend on "Maximum Delta S".

Based on your details, you can use a single solution frequency at 94 GHz and define a frequency sweep between 90 and 100 GHz. The fields are only calculated at solution frequency. Use discrete sweep if you want to save fields for post-processing in the band of interest. However, the number of sweep points should be defined cautiously as saving fields would consume more disc space over a frequency band. Use an interpolating sweep, if fields are not required to save.

Please go through "An Introduction to HFSS" and "An Introduction to Multi-Frequency Adaptive Meshing in HFSS" documents available under Help > HFSS PDFs > HFSS Getting Started Guides.

You can also go through this video-based free AIC course on HFSS simulations for microwave components - Microwave Passive Component Simulation Using Ansys | Ansys Courses.

Best regards,
Praneeth.