Hello,

I am trying to simulate the microstrip line with the waveguide port but the result is unusual. Could you please help to trace the issue.

I have attached the CST file here. Substrate height is 0.254mm.

.









thank you

 

I can't open the CST file on my personal computer, so there's a few things I can't check myself, but I can ask here:

• What is your background material? PEC or "Normal?" Your background should be "Normal," unless you've defined an airbox.
• When you select each port individually, which direction are the normals pointing? Inward or outward? They should point inward.
• What are your boundary conditions? Are all boundaries grounded? Your max Z should probably be "open" (unless you're designing this to be in an enclosure), and whichever axis your microstrip is aligned to (looks like the x-axis?) should probably both be open at min/max.

I personally would also select "ensure shielding" on your ports.

 

• What is your background material? PEC or "Normal?" Your background should be "Normal," unless you've defined an airbox.

• When you select each port individually, which direction are the normals pointing? Inward or outward? They should point inward.

-> Both are inward pointed.

• What are your boundary conditions? Are all boundaries grounded? Your max Z should probably be "open" (unless you're designing this to be in an enclosure), and whichever axis your microstrip is aligned to (looks like the x-axis?) should probably both be open at min/max.

Yes i have selected ensure shielding now.