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HFSS Radiation boundary issue: hf3d error - An internal radiation boundary has been detected

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idzahad

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I have modeled a structure with a microstrip, a waveport and a lumped port. The waveport is defined on the face of a vacuum waveguide. I have defined a radiation boundary around the whole structure maintaining the \[\lambda\]/4 protocol. However, I was getting the error. So, I brought the corresponding airbox face to the same plane as the wave port and subtracted all other objects from the airbox while keeping their copies. Still getting the same error.

Also, is it necessary to back the waveport with a PEC? Why? If I do not assign Conductor on the waveport, I get another hf3d error: An internal radiation boundary has been detected which HFSS does not support. Any help or resources would be of great help. I want to know how to define radiation boundary properly in any circumstances.

Thanks
--- Updated ---

* The other hf3d error is : waveport s is internal to solution domain and not fully backed with a PEC object. Sorry, it was my mistake.
 
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