Wave Port in An Shield Box. Help! Thanks!

Hi everyone,

I have three ways to set the waveport for a structure in a shield box in HFSS. Could you please have a look the following pictures, and tell me which one is more reliable (realistic)? Thank you so much!

The first one, only the left/right/top/base are surrounded with copper plates. The air cavity is made with a vacuum box in HFSS. Thus its front and back faces are open to the background and set by PEC. Therefore, the waveport is on PEC face.

The second one, the front/back faces are also covered with copper plates. The waveport is thus on the copper face.

The third one, the front/back faces are covered with copper plates. But the space from the waveport to background is replaced with PEC.

Hi.
what is your design?is it SIW waveguide?
please completely explain your design and question?
Good Luck.

Hi fereshteh,

Thank you for your reply. It is a SIW with its transition of a microstrip line.
The waveport is used to excite the microstrip line. However, I am not sure which one of the above three sets is correct for a microstrip line in an enclosure box. Could you please give me some suggestions?

Hi.
I send for you two files(my design and other design that help me).
I hope these files helpful for you.