CPW

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Puppet1

Joined: 07 May 2004
Posts: 881
Helped: 2

30 Jun 2004 20:28 hfss tutorial cpw

Anyone have any example projects/setups for doing CPW in HFSS or Momentum ?

Thanks

dr_em

Joined: 02 May 2004
Posts: 17
Helped: 1
Location: New England

30 Jun 2004 22:40 coplanar waveguide ppt

Don't know about HFSS as I haven't sat down to learn it yet, but in momentum, and designer/ensemble, CPW is handled by defining an infinite ground plane and drawing slots for the gaps between the signal and gound traces. In momentum place the ports at the edges of the slots you just drew (you can enable edge & midpoint snaps to help with this) and then use the port editor to define them as coupled.

Alternatively, if you want a finite ground trace you could draw the ground-signal-ground traces on a regular trace layer, place six ports on the structure and, again using the port editor, define the two ports attached the signal trace as internal ports while setting the other four ports to be ground references for the signal ports in their respective planes. The simulator will give 2-port S-parameters with this setup.

I guess it would be possible to setup a finite ground cpw structure in designer/ensemble as well with a similar setup as momentum except that you can't define a ground reference for both ground traces. You can't setup ground reference at all in ensemble (stand alone product), as far as I know. I suppose that you can simulate the structure and take the 6-port data back into the circuit simulator and connect the ground ports together and use that node as the reference node for the signal port. Just spitballing here, haven't really tried this to see if it would work since I'm able to get what I want done between momentum and sonnet.

Iknow you didn't ask for the designer/ensemble information, but thought it might help anyone else reading the thread that had designer/ensemble instead of momentum, or at the very least start some healthy discussion. After all thats what these boards are for, right?

ananth

Joined: 29 Jun 2004
Posts: 114
Helped: 12
Location: India

04 Aug 2004 17:39 super cpw 5 indir

Hey,
Heres a tutorial on defining CPW's in HFSS.
Hope this helps.
Ananth.

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pepino

Joined: 26 Jan 2005
Posts: 19
Helped: 1

07 Jul 2005 19:42 cpw waveport cst

ananth wrote:

Hey,
Heres a tutorial on defining CPW's in HFSS.
Hope this helps.
Ananth.

Man, you rock!

Thanks a lot!!!

If you have more tutorials like this, please make us informed!

cvenkat

Joined: 08 Jun 2005
Posts: 96
Helped: 1

07 Jul 2005 20:50 coplanar waveguide ppt

thanx a lot ananth. I feel the same way as pepino.
yeah if u have more like thie let us know ...

ADS_RFMW

Joined: 18 Aug 2005
Posts: 136
Helped: 4

16 Sep 2006 6:48 cpw agilent

use Agilent momentum

ThaiHoa

Joined: 30 Mar 2004
Posts: 34

19 Sep 2006 6:51 coplanar waveguide, ppt

ananth wrote:

Hey,
Heres a tutorial on defining CPW's in HFSS.
Hope this helps.
Ananth.

With this file we can easy design wave port for CPW. However, in some cases, the distance between 2 CPW is to close, closer than the width of wave port. in that case, how can we excite CPW.
I tried to use lump port to excite cpw but the result is not good as using waveport.

Google
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19 Sep 2006 6:51 Ads

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abuantenna

Joined: 14 Nov 2005
Posts: 185
Helped: 1

19 Sep 2006 23:48 intern ports for cpw on cst

Sorry for my question. I'm very new in HFSS world.

If I have substrate and CPW on top without ground. Then, I learnt from the above tutorial the dimensions needed for this case.

My questions:
1-How can I define the wave port ? Shall I draw rectange and assign it as wave port ? or how ?

2-and how shall I define the boundaries ? I'm using CST and put all as "open" ecept +z and -z "open add space". What should I do with HFSS??

Thanks in advance

ananth

Joined: 29 Jun 2004
Posts: 114
Helped: 12
Location: India

20 Sep 2006 4:44 coplanar waveguide/ppt

Hey Abuantenna,
You were right when you said you just draw a rectangle and assign a waveport to it. Just be dure to define the integration line from the CPW to the ground plane. Obviously, the port is going to be perpendicular to the plane of the CPW and you know the approximate sizes of the edges of the port.
I had another suggestion. Before you hit the analyze button for the whole structure, do simulate the ports first and see if the port impedances are what you need in your structure.

I've never used CST and hence wouldn't know what you're talking about! Smile

Ananth.

Added after 2 minutes:

Dear Thaihoa,
Its indeed a unique peoblem you're facing. Have you tried defining the waveports as suggested earlier with the ports overlapping in case of the CPW's being so close? Does it create a problem? I've never really faced such a problem but wud've definitely tried this before moving on to the lumped ports.

Ananth.

abuantenna

Joined: 14 Nov 2005
Posts: 185
Helped: 1

20 Sep 2006 22:26 momentum cpw

Thanks a lot.

I've got another question.
When I draw the phase results in rad., I can see the result between ±3.
My question: How I can draw between let say ±10 ??
So, to compensate for the phase response.

arashkhajooei

Joined: 27 Sep 2006
Posts: 4

27 Sep 2006 3:15 coplanar waveguide,ppt

ananth wrote:

Hey,
Heres a tutorial on defining CPW's in HFSS.
Hope this helps.
Ananth.

Hello,

I don't know how to see the attachments? It needs points? How can I get a point? I'm new to this forum and I don't know how to get points but I really need to know how to define a coplanar port in HFSS....

Thanks
Arash

Added after 12 minutes:

ADS_RFMW wrote:

use Agilent momentum

Agilent Momentum is very good, but it doesn't include metal losses for the coplanar transmission lines unfortunately.

Arsah

Added after 40 minutes:

I have tried ground-signal-ground. at port 1, my integration line was from gnd1 to signal, and at port2, my integration line was from gnd2 to signal. but the field lines in the solution for this mode seems to be from gnd1 to gnd2, i mean, they don't start from signal line. there should be another way...

Carleone

Joined: 13 Oct 2006
Posts: 2

13 Oct 2006 16:02 ports momentum coplanar waveguide

Hello!

I'm new in this forum but I would be very interested in looking at the file port_tutorial_CPW.ppt which explains the design of the CPW in HFSS.If someone can send it to me to my e-mail, it would be greatly appreciated.

Thank you,
Carlos

czheng

Joined: 05 Nov 2006
Posts: 5

05 Nov 2006 3:33 coplanar waveguide cst

thanks
use hfss 9

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czheng

Joined: 05 Nov 2006
Posts: 5

05 Nov 2006 4:39 ppt of coplanar waveguide

good pdf tutorial

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dingjingfeng

Joined: 12 Aug 2005
Posts: 196
Helped: 9

06 Nov 2006 9:58 metal loses agilent momentum

what's the difference between v9 and v10

mauroferrari_

Joined: 21 Nov 2006
Posts: 17
Location: Rome

21 Nov 2006 18:20 coplanar waveguide +ppt

Anyone have any example projects/setups for doing CPW simulations in CST ?
I've tried with multipin port and I've simulated a simple cpw line but i don't know how to simulate 2 port in the same side (like the ports in a wilkinson coupler)

Thanks

mauroferrari_

Joined: 21 Nov 2006
Posts: 17
Location: Rome

22 Nov 2006 13:24 Re: CPW

I give you the CST project so you can help me on define the ports for this coplanar circuit in CST

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algongar

Joined: 07 Nov 2006
Posts: 1

28 Nov 2006 18:09 Re: CPW

Hi,

I need this CPW tutorial to simulate some CPW-based circuits with HFSS but i cannot download it as I dont have the required amount of points to check attachments.

Somebody knows if I can get it in the internet? or could you post it somewhere where I can access?

Thanks a lot

hitzwt

Joined: 30 Nov 2006
Posts: 1

30 Nov 2006 11:02 Re: CPW

I am new in this forum. Could someone email me any example projects/setups for doing CPW simulations in HFSS ?

Thanks

electrosysdo

Joined: 09 Jul 2003
Posts: 6

04 Dec 2006 19:49 Re: CPW

Anyone have any example projects/setups for doing CPW in HFSS or Momentum ?
yes

rautio

Joined: 21 Feb 2005
Posts: 297
Helped: 23
Location: North Syracuse, NY

05 Dec 2006 2:16 Re: CPW

Download SonnetLite (www.sonnetsoftware.com, I work for Sonnet). First do Help->Tutorial, takes about 45 minutes. Then do help->manuals->Sonnet User Guide->Chpt 23, coplanar waveguide. Then do help->examples->coplanar waveguide.

lehuutruongbk

Joined: 07 Mar 2007
Posts: 1

12 Mar 2007 7:51 Re: CPW

I'm a new one here and I don't have enough score to download some attachments in this topic While I'm working with HFSS and need them much. So if it's possible, from your kind consideration, please send to me via email (huutruongdt5(at)yahoo.com) I'm very thankful.

nbodzin

Joined: 13 Feb 2007
Posts: 1

09 May 2007 22:53 CPW

Thanks so much for the tutorial. helped a lot.

mfarhan1

Joined: 20 Apr 2007
Posts: 331
Helped: 177
Location: UK

09 May 2007 23:49 Re: CPW

@arashkhajooei
momentum do include conductor losses for CPW, but for that you need to define strip line not slot line, i am working on similar thing using CPW, i prefer momentum, it is much faster than HFSS and for planar circuit we dont need full wave solver, so momentum is best for planar structures

semsemharaz

Joined: 09 May 2007
Posts: 1

19 May 2007 0:29 CPW

I need help in CPW in HFSS

Added after 54 minutes:

Can anybody help me in understanding CPW in HFSS?

walaa3d

Joined: 09 Sep 2006
Posts: 42

17 Jun 2007 14:10 CPW

thanks

nhomuathu_hanoi

Joined: 26 Apr 2007
Posts: 96
Helped: 7
Location: Hometown

18 Jun 2007 11:15 Re: CPW

hi,
This is port_tutorial in HFSS. I hope you will have necessary infomation.

Cheers!

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wlivy

Joined: 19 Jun 2007
Posts: 1

19 Jun 2007 1:13 CPW

Hi, I need help on CPW in HFSS or momentum. But I couldn't download the attachment Sad

miguellopez8

Joined: 02 Jul 2007
Posts: 2

02 Jul 2007 17:30 Re: CPW

All the information above is really interesting, but the question is how you define the 2 ground planes, because all the simulations I have done with HFSS give me bad results.

Thanks a lot