EBG structure modeling in CST

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prafuldeo

Joined: 26 Mar 2008
Posts: 153
Helped: 10
Location: UK

08 Apr 2009 15:29 EBG structure modeling in CST

Hello Shahid,
Thanks for your reply. I was thinking about using the probes but because samii used reference plane so I used the full face waveguide port . But I'll surely try probes too. Have you simulated the same Samii EBG by using microstrip line? Did you able to get the band-gap similar to Fig. 2 of the paper?? Please upload the microstrip model of the samii paper if you have one, so that I can check it too because for some reason I am not able to get the correct results for it.

Thanks
Praful

meerek

Joined: 13 Mar 2009
Posts: 8

17 Apr 2009 13:17 Re: EBG structure modeling in CST

Hello

"-frequency domain solver:
1/using unit cell and do a de-embedding "

I tried simulate EBG with unit cell method, how says piboo, but not succesful. Please can you tell me someone, how is exatly settings for one cell, I used "unit cell" for "x" and "y" walls and "Zmin=electric" and "Zmax open(add space)", default port in Zmax, but I doñ no, if I must use now some port too...next I used Theta = 90 ... I add my model on the screen...

Thanks very much

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prafuldeo

Joined: 26 Mar 2008
Posts: 153
Helped: 10
Location: UK

18 Apr 2009 7:49 EBG structure modeling in CST

hello meerek,
make y=magnetic, rest electric and de-embade the port to top of ebg patch. then use transient solver and look for arg of s parameters. you should get the reflection phase.

Regards
Praful

meerek

Joined: 13 Mar 2009
Posts: 8

18 Apr 2009 15:36 Re: EBG structure modeling in CST

prafuldeo

I tried your settings, but when i place port on top of ebg patch CST write error - Wavequide is to short -,or do you mean place the port at some distance from patch?

thanks

prafuldeo

Joined: 26 Mar 2008
Posts: 153
Helped: 10
Location: UK

23 Apr 2009 15:38 EBG structure modeling in CST

Hello meerek,
yes put the port at some distance and in port option de-embbed the port to the top of the patch. I think its under distance for reference plane option. Try it otherwise I'll set it for you just upload your model.

Regards

olanska

Joined: 06 Mar 2009
Posts: 1

24 Apr 2009 8:37 Re: EBG structure modeling in CST

I have a question.

I put the waveport at 10, and the top of the unit cell is at 0. Does it mean I should put the distance away at -10?

If it is right, I want to know whether the top of the unit cell having a PEC condition will influence the result?

Thx.

shahid78

Joined: 29 Jul 2006
Posts: 328
Helped: 28

14 May 2009 14:07 Re: EBG structure modeling in CST

hi piboo

well i was trying to use your method of deembeding the port for unit cell template in frequency domain solver.

but i am getting an error when i evaluate the post procesing result.

let me ask you some questions.
in you post you write this in the 3rd step;

/ You need to have a file which contains all the frequency points. For that Copy a *.sig file in your CST folder and rename it as Fband.sig (for example). Then In CST copy one of your result, for example, your phase result.
Open Fband.sig with excel, delete all and paste it.

i dont understand what do u mean when you say "then In CST copy one of your result, for example, your phase result."

we have already laoded the phase results using laod 1D results. and in this step all we are doing is create a file which contain all the frequency points. so i dont understand when u saind in cst copy one of your result??

also when i open the *.sig file in excel. all the data is contained in one column.

so how could you say delete all the data but not the first column which contains the frequency points?

i will appreciate if you could answer these questions

regards

shahid78

Joined: 29 Jul 2006
Posts: 328
Helped: 28

30 Sep 2009 12:52 Re: EBG structure modeling in CST

Hi Prafuldeo

long time no new updates from your side.

how you are getting along with EBG simulation?
any success in simulating EBG surface wave bandgap in CST

looking forward to your comments

regards

prafuldeo

Joined: 26 Mar 2008
Posts: 153
Helped: 10
Location: UK

06 Oct 2009 20:39 EBG structure modeling in CST

Hello Shahid,
I've finished the EBG simulations. Regarding surface wave bandgaps the model I sent you is the best and giving me satisfactory results so I am sticking with it. Every software gives slightly different results so until they are very different I m ok with it. You tell howz your work going? Did you do anything after simulating that double square FSS?

Regards
Praful

hntko

Joined: 11 Jun 2009
Posts: 13

05 Nov 2009 7:42 Re: EBG structure modeling in CST

Hi piboo,

Have you finished writing your application note on different methods to characterized EBG in CST? Pls upload the document. It would be really helpful for me since i am looking for some tutorials about EBG in CST.

Thank you very much.

Le