Defected Ground Strutcure (DGS) with HFSS

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dragonhamada

Joined: 04 Jan 2007
Posts: 16

04 Sep 2009 1:13 hfss ground

I have work on filter design (bandpass filter) and i am designing filter with defected ground structure and i was simulate my design with AWR(Applied Wave Research) or Microwave Office.

Now I turn to HFSS to learn and simulate with it

Can anyone help me on how to model the defect on the back metal ?

the defect is an etching area in a metal in any shape like C-shape or Hairpin

attached a photo to the defect
Thanks for everyone

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dragonhamada

Joined: 04 Jan 2007
Posts: 16

08 Sep 2009 2:45 defected ground plane-ads

Hi everyone
No one can help it is urgent topic

couless

Joined: 06 Jun 2007
Posts: 15
Helped: 2

09 Sep 2009 3:16 Re: Defected Ground Strutcure (DGS) with HFSS

Hi,

First define your ground plane as perfect E, then draw the C shape structure (3 rectangulars), assigned these elements as perfect H ( slots in a metal). You can simulate after that. Let me know, if you have any problem.
Thanks

dragonhamada

Joined: 04 Jan 2007
Posts: 16

01 Oct 2009 19:38 Re: Defected Ground Strutcure (DGS) with HFSS

Thanks
first i was want to know how to made the defect in the ground(how to etch the C-shape)
and i was modeled

Now
you say to make the ground plane perfect E and the defect as perfect H
why you say that?

i simulate without assinging any of these but the result was not satisfactory
hope you to reply to my question?

Thanks again

Eng.M.Hasanien

pabloec

Joined: 20 Sep 2007
Posts: 53
Helped: 9

06 Oct 2009 14:22 Defected Ground Strutcure (DGS) with HFSS

why dont you simulate using the perfect E perfect H suggestion?

dragonhamada

Joined: 04 Jan 2007
Posts: 16

07 Oct 2009 0:28 Re: Defected Ground Strutcure (DGS) with HFSS

i cannot understand if i assign the three rectangular as perfect-H before or after i subtract them from the ground?

and if i assign them as perfect-H i can subtract the rectangular or not?
i will try this

Thanks,

Eng.M.Hasanien