Reply To: Boundary – HFSS

[Praneeth]

Please find my responses below:
>> Does the boundary have to cover the entire geometry?
HFSS treats everything outside the simulation model as PEC (Perfect electric conductor) by default. This means the regions which you do intend to keep between the objects in the model are treated as PEC and you have to explicitly define air box around your simulation model to create a space for your model.
>> Is it important that the boundary has to be ~lambda/4?
>> Would the boundary that is significantly smaller than lambda/4 result in inaccurate simulations? My model is 3cm. If I select the default distance, the boundary would be 375m. It is too big compared to the size of my model.
This is only required if you have a radiating element and that too if you are using a radiation boundary. If your model does not contain any radiating element then a simple air box surrounding your model is sufficient. You can keep some nominal distance of your distance and arrive at the optimistic distance by using trail and error method.
>>When in doubt, which type of boundary should I select to get started?
Boundary conditions are only for specific needs. I would suggest you to go through the Help pdf document for detailed case by case use.
Kindly go through the provided examples and getting started guides to learn to use the tool capabilities to efficiently use it for your use.
All the very best.