• 易迪拓培训,专注于微波、射频、天线设计工程师的培养
首页 > CST > CST使用问答 > THz FSS (frequency selective surface) simulation with CST

THz FSS (frequency selective surface) simulation with CST

录入:edatop.com     点击:
Hi,

I'm trying to simulate a frequency selective surfaces in CST MWS.
I am using Frequency solver with floquet mode boundaries, meaning I choose unit cell for X,Y and open (add space) for Z.
Right now I'm only interested in transmission coeff. for zero incident angle, so I select only the first 2 floquet modes TE(0,0) and TM(0,0) for excitation (corresponding to a plane wave).

Now, my problem is the following.
When I simulate from 1 to 20 THz I get a different result than going from 1 to 10, then from 10 to 20 and then just putting the second graph at the end of the first.
I added a picture to show what I mean.
Attachment 53046
The top pictures are the single 1-10 and 10-20 measurements. The middle one is the combination of them.
The bottom picture shows the full 1-20 measurement, missing the two additional peaks at 8.5 and 9.5 THz.

Could anyone try to explain why this happens. And why only for 1 to 10 THz, because the 10-20 part looks pretty much the same in both calculations.

The results, in general, also seems to differ from the literature (see second attached picture).
Attachment 53047
Peak transmission frequency at 100% is the same, but where do the sidelobes (90% !) in CST come from? Due to the above problem I cannot really trust the CST calculations. Who tells me I chose the correct interval?!?!

By the way, the structure (for testing purpose) is a simple 33x33um square aperture in an infinitely thin 51x51um copper sheet. So not at all some kind of a "complicated" structure, but like the simplest case possible.

I hope anyone can help me. I'm almost sure I'm only doing a very basic mistake, assuming CST does not deliver incorrect results for such simple calculations ;)

I'm wondering if this could have anything to do with the mesh model being automatically adjusted for different frequency regimes?

i cant open the attachment. can u reattach. I think its because of the mesh. Meshing will be done based on highest wavelength. So the mesh will change for 1-10, 10-20 and 1-20 GHz. Check the "Mesh Properties" option. There you can see a option "steps per wavelength".

申明网友回复良莠不齐,仅供参考。如需专业解答,请学习易迪拓培训专家讲授的CST视频培训教程

上一篇:How to use Differential Port Setting in CST 2009?
下一篇:E-plane and H-plane radiation patterns CST Microwave Studio

CST培训课程推荐详情>>

  网站地图