surface wave bandgap characterization of EBG structures

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shahid78

Joined: 29 Jul 2006
Posts: 328
Helped: 28

01 Jun 2009 19:33 characterisation of ebg

Hi

in order to find the surface wave bandgap of periodic structure, the best method is to find the dispersion diagram of periodic structure using unit cell and eigen mode solver in CST.
i am just wondering does anybody successfully find the surface wave bandgap of EBG structure using this approach.
i will be obliged if someone uplaod his model and tell us how he has done it

secondly in some papers . people are using microstrip line over EBG structure and from S21 they are extracting surface wave bandgap.

i have doubt about this method . i mean is this method take into account both TE and TM wave bandgaps? if not what other method we can use to find the surface wave band gap of periodic structures

i hope many people will benefit if someone share his knowlege over here

looking forward to hearing your comments guys

regards

GameKing

Joined: 19 May 2008
Posts: 8

03 Jun 2009 16:01 surface wave bandgap characterization of EBG structures

Hi shahid78
I think the dispersion diagram of periodic structure using unit cell or eigen mode solver in CST only help u to find out the natural physical.
But the problem of EBG is application on the real.
When using EBG in application, for example: the antennas, u will see that EBG is more and more different and complex. However, with 3 classic model of EBG, u can research them on the real so easy.

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shahid78

Joined: 29 Jul 2006
Posts: 328
Helped: 28

03 Jun 2009 19:07 Re: surface wave bandgap characterization of EBG structures

hi

i dont understand what do you mean by 3 classic model of EBG?

also i dont think so the behaviour of EBG and its application is much different.

can you explain a bit what you want to say

thanks

shahid78

Joined: 29 Jul 2006
Posts: 328
Helped: 28

30 Sep 2009 12:57 Re: surface wave bandgap characterization of EBG structures

Hi

anyone manage to successfuly simulate the surface wave bandap of EBG structures using probes or loops using CST or HFSS?

any comments would be helpful

regards

prafuldeo

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

06 Oct 2009 20:35 surface wave bandgap characterization of EBG structures

Hello Shahid,
The EBG solution which I sent you is equivalent to probe model in CST. So the S21 results will give you the desired bandgap.

Regards
Praful

piboo

Joined: 06 Feb 2008
Posts: 84
Helped: 2

29 Oct 2009 16:01 surface wave bandgap characterization of EBG structures

Hi prafuldeo,

which model are you talking about ? Can you explain to me a little bit more ?

regards

piboo

prafuldeo

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

05 Nov 2009 20:49 surface wave bandgap characterization of EBG structures

Hi Piboo,

It was using finite ebg structures and putting two ports at each sides. The boundary conditions are kept open space. This gives the results as practical measurment.

Regards
Praful