cst substrate definition

Hi all,
I am simulating a microstrip line on a mixed air-Silicon substrate. I define wave ports for the two ends. I am getting an error message. " Waveguide for Port number 1 is too short. The waveguide must be homegeneous for atleast three meshplanes in the propagating direction". I have ensured that the substrate is finely meshed to ensure it has atleast 8 cells in the x-direction which is also the direction of propagation. Still theerror keeps popping up. What do I do ? Thanks for your time.
-svarun

Hi ,
can you post the model here?
F.

Hi Svarun!
Is the line homogenous along your 8 cells?
I don't see any other problem...
Cheers
e.

Hi Eirp and RF simulator,
Can you please tell if what I understand by homogenity is correct ? This is what I understand.
Suppose my propagation direction is say x. I basically make three thin slices corresponding to the three cells along the x axis and equal to the extent of the waveguide port in the y-z plane. Then I look at the three slices. They should all be identical meaning they should overlap on each other exactly. Is this right. Please tell if this is correct ?
PS : If this is right then my model doesn't satisfy this and so I cannot simulate it. I have to figure out other ways. Thanks for your time.
-svarun

Dear friend
Homogenity means that the feeding waveguide is not changing dimensions in transversal direction (in your notation yz) during 3 slices in x (propagation) direction, OK?
I have attached simple picture..
If this doesnt help, please post your project here!
Best regards
eirp

Dear friend
Homogenity means that the feeding waveguide is not changing dimensions in transversal direction (in your notation yz) during 3 slices in x (propagation) direction, OK?
I have attached simple picture..
If this doesnt help, please post your project here!
Best regards
eirp