CST Waveguide Ports Problem

[ferdah]

cst waveguide

Hi,
I am a beginner user of the CST and I am simulating SRR structures. I want the waveguide ports as close as possible to the SRR. When I put the waveguide ports at the end of the SRR structure it gives me the folloving error.

"Waveguide for port number 1 is too short. The waveguide must be homogeneous for at least there mesh planes along propagation direction"

How can I solve this problem and get very close ports to the SRR?
I attached the CST file. For this structure, I want to get a unit cell with 2.5mmx2.5mmx2.5mm dimensions. However, when I applied this condition, SRR touches to the ports. How can I solve this problem without changing the port distances and SRR dimensions?
Thanks

 

[mauloftin]

cst files waveguide structure

Hi,
I think, that the sentence "Waveguide for port number 1 is too short. The waveguide must be homogeneous for at least there mesh planes along propagation direction" is understandable. Try find it in this forum, it is typical problem. Solution: You must increase meshcells - but it is not good for time, or better: little change your structure, the port need 3 meshcells in front of a homogeneous.

And btw are you sure, taht you have port on the correct side of your structure ?

I hope, that I helped you.

 

[mimi_rafei]

the waveguide must be homogeneous

Hi,

CST has two types of meshing, the universal or the local. To avoid increasing mesh unnecesarily, u can try build a component where u can locally mesh the area so as to include 3 mesh!

U can email me if u don't understand. I currently don't have access to CST, so, am not able to check ur project file, but if u cud take snapshots of the structure (including the mesh), I might be able to help u!

Take care, and all the best!

 

[ravi8331]

cst waveguide is too short cst

Hi,
I think, that the sentence "Waveguide for port number 1 is too short. The waveguide must be homogeneous for at least there mesh planes along propagation direction" is understandable. so for removing this problem You must increase meshcells - but it is not good for time, so plz do the little increase in your waveguide port size, the port need 3 meshcells in front of a homogeneous.

 

[mauloftin]

3 port waveguide

Hi,
I think, that the sentence "Waveguide for port number 1 is too short. The waveguide must be homogeneous for at least there mesh planes along propagation direction" is understandable. so for removing this problem You must increase meshcells - but it is not good for time, so plz do the little increase in your waveguide port size, the port need 3 meshcells in front of a homogeneous.

This is my sentence higher

 

[yattharth]

Re: cst waveguide

Hi,
I am a beginner user of the CST and I am simulating SRR structures. I want the waveguide ports as close as possible to the SRR. When I put the waveguide ports at the end of the SRR structure it gives me the folloving error.

"Waveguide for port number 1 is too short. The waveguide must be homogeneous for at least there mesh planes along propagation direction"

How can I solve this problem and get very close ports to the SRR?
I attached the CST file. For this structure, I want to get a unit cell with 2.5mmx2.5mmx2.5mm dimensions. However, when I applied this condition, SRR touches to the ports. How can I solve this problem without changing the port distances and SRR dimensions?
Thanks

this may happen when your model geometry is non uniform along any axis(like in cone)
you may try creating a regular geometry figure(cylinder/cube)right in front of the irregular geometry and then define port on the latter.
check if that helps