[CST] Why can't i simulate SRR structure with CST?

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smithjim

Joined: 24 Mar 2008
Posts: 13

24 Mar 2008 4:47 srr simulation cst

I tried to use CST to simulation a simple SRR structure in GHz. The scale followes the data from fig1 in ref.<Electromagnetic behaviour of left-handed materials>. But when the simulation begins, it always been aborted automatelly with the error:

the current settings will probably lead to a very long simulation time
you may improve the simulation speed by:
1. checking the frequency range and units settings
2. extending the simulation frequency range
3. checking the mesh to avoid very small mesh steps
error during construction of pre-conditioner. Not enough memory

I don't know what's the problem. Anyone could tell me ? Thx.

the attachment is the folder of the save results in RAR file.

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snkhan

Joined: 19 Oct 2005
Posts: 294
Helped: 15
Location: Gods place

24 Mar 2008 11:39 cst srr simulation

First of all can u please upload the Fig from what u r simulating he book.
There are many potential errors in your simulation.
1)port 1 -50mm away from your structure
2) boundary condition are not right
3) the structure is neither coplanar fed nor microstip type.
4) There is no ground plane.

In addition u want to excite the structure plane wave or simple waveguide

smithjim

Joined: 24 Mar 2008
Posts: 13

24 Mar 2008 15:43 srr cst howto

Thx for your attention. The reference is not a book but a literature. I uploaded it in the new attachment.

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smithjim

Joined: 24 Mar 2008
Posts: 13

24 Mar 2008 16:04 can srr

Hi snkhan

1) the port's position is determined by the open (add space) boundary condition in the X axis. I know it is strange but don't know how to change it and what's the effect of the changing.
2) I don't understand the boundary condition very well. what i only know is that the wave vector should be along the x axis and the H component should penetrate the rings. Actually the SRRs structure should periodic arranged in the YZ plane. But I heard that under the boundary condition I settled the result should equal to the periodic array. I even try to use periodic condition but the error code occurs again :
waveguide port 1 touches periodic boundary! This is not supported by transient solver. pleasechange port definition or boundary condition.

because I 'm not a guy major in microwave i don't quite understand your last two replies. Could you please give me a detailed explanation?
THx and waiting for your reply again.

snkhan

Joined: 19 Oct 2005
Posts: 294
Helped: 15
Location: Gods place

24 Mar 2008 16:32 srr cst

See this simulation of SRR, i hope it might help u

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smithjim

Joined: 24 Mar 2008
Posts: 13

24 Mar 2008 16:37 cst simulation big structure

Received and understanding THx a lot

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smithjim

Joined: 24 Mar 2008
Posts: 13

24 Mar 2008 23:44 cst srr boundary

Hi snkhan,
I have thought about your design but I have some questions not quite clear:
1) if my structrue is an array of SRR, does your boundary condition works for my design? How to use the periodic or unit cell boundary condition for a simple model?
2) why did you divide the whole SRR line in two components?
3) there is a big cuboid contains both the components , what's its function?
Thanks & waiting for your reply.
Jianqiang Gu

snkhan

Joined: 19 Oct 2005
Posts: 294
Helped: 15
Location: Gods place

30 Mar 2008 14:35 cst not enough memory error

@Smithjim

1) Boundry condition depends strucuture but in my opinion in this case open space if better however u want to reduce the time then u can use the default setting using the coplanar templete in CST
2) My stuructre was re-simulation of a paper, Anyhow its because to enhance the band rejction offered by SSRR
3) i didnot understand what u mean ^.^

abdoeng

Joined: 22 Feb 2004
Posts: 685
Helped: 14
Location: EGYPT

30 Mar 2008 18:15 error during construction of pre-conditioner

smithjim,try use WGA method,it sooooooooooo easy in srr reflection phase figure plotting
regards

xiangyuanjiang

Joined: 27 Aug 2006
Posts: 14

12 May 2008 6:48 not enough memory cst 2008 error

I want to download iyt, but I have no enough point@

xiangyuanjiang

Joined: 27 Aug 2006
Posts: 14

14 Jun 2008 8:11 cst how to dicide waveguide port

I also want to download iyt, but I have no enough point

tungsin

Joined: 26 Dec 2007
Posts: 17
Helped: 3

19 Jun 2008 10:18 [CST] Why can't i simulate SRR structure with CST?

i really want to see snkhan's model but my CST is too old Sad

sangwoo

Joined: 21 May 2007
Posts: 27
Helped: 10

04 Sep 2008 12:16 [CST] Why can't i simulate SRR structure with CST?

Thanks for snkhan's advice. I have a problem like smithjim. I think that in snkhan's model is a co planar srr, but i want to simulate the mtm structure (periodic structure, because mtm will show negative mue and eps in the periodic structure) for check it properties. Could you give me a suggestion and an example in CST?
Thanks,