[SI-LIST] Re: CPW in HFSS, ask for help
- From: "Chandrasekhar Arun" <achandra@xxxxxxx>
- To: <mike_bihan@xxxxxxxxxxxx>
- Date: Wed, 12 Feb 2003 20:48:56 +0100
Charles, I agree 100% - and I believe that my answer will only serve as =
a link between the person concerned and the Ansoft AEs !
According to me, the condition for the CPW ports ( >3(2g+w) makes no =
sense to me, although it works - well. I think that this is where you =
will really need the Ansoft AEs who can tell you the rationale behind =
this condition. I did not ask mine yet, but I am preparing a list of my =
doubts in HFSS which is longer than the European Union constitution =
!!!!!
Reg. Zpi,pv and vi - you should get more or less the same values. I have =
read in a paper somewhere that Zpi is to be used for microstrip types =
and Zpv for CPW (or the other way around) and Zvi is just the mean value =
of the two. One suggestion - if you get very different Z values, then =
change "something" and re-simulate !!
I hope this helps=09
=20
Arun Chandrasekhar
PhD Student: RF Packaging =09
IMEC | MCP/MaRS Group =09
Phone: +32 16 28 82 28 =09
Fax: +32 16 28 10 97 =09
Email: achandra@xxxxxxx <mailto:achandra@xxxxxxx> =09
Seeds for Tomorrow's World <http://www.imec.be/> =09
=20
IMEC, Kapeldreef 75, 3001 Leuven, Belgium | Phone:+32 16 28 12 11 =
Fax:+32 16 22 94 00 | Website: www.imec.be <http://www.imec.be/>=20
This e-mail and/or its attachments may contain confidential information. =
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-----Original Message-----
From: Bi Han [mailto:mike_bihan@xxxxxxxxxxxx]
Sent: Tuesday, February 11, 2003 10:31
To: Chandrasekhar Arun
Cc: List` Si
Subject: [SI-LIST] Re: CPW in HFSS, ask for help
Nice to hear reply from you !=20
Actually, what I am wondering is that the "wave port" 's size is =
somewhat hard to match two important criterion in the same time:=20
1. The port need to be large enough to reduce edge-effect.( >3(2g+w) =
recommended)=20
2. port's left & right edges need to contact the two side- grounds to =
let them be connected together, to form the "lateral ground".=20
However, it is tough to meet above two requirements sometimes. For =
instance, since the lateral metal trace have limited width, it is very =
possible that the port had to be so wide (that all three metal traces =
are included in the port) to meet requirement 1. Then, the edge of port =
will bot contact lateral grounds. These two side-grounds are seperated =
eletrically.=20
How to resolve this issue?=20
Thanks!
Bihan @ Sjtu,Emlab=20
Chandrasekhar Arun <achandra@xxxxxxx> wrote:
Hello Bi Han, Pls see a ppt file in the attachment that I used for this =
purpose. If you stilll have questions, pls get back to me and we can =
discuss. I have not tried the lumped gap source (I use only wave ports), =
but if u have some interesting comparison, it would be nice to have a =
look at.Regards Arun Chandrasekhar PhD Student: RF Packaging IMEC =
| MCP/MaRS Group Phone: +32 16 28 82 28 Fax: +32 16 28 10 97 Email: =
achandra@xxxxxxx IMEC, Kapeldreef 75, 3001 Leuven, Belgium | =
Phone:+32 16 28 12 11 Fax:+32 16 22 94 00 | Website:www.imec.be
This email and/or its attachments may contain confidential information. =
It is intended solely for the intended addressee(s). Any use of the =
information contained herein by other persons is prohibited. IMEC vzw =
does not accept any liability for the contents of this email and/or its =
attachments.A.ch:link { COLOR: #1e355e; TEXT-DECORATION: =
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COLOR: #b61e5c}A.ch:hover { COLOR: #b61e5c}BODY { SCROLLBAR-FACE-COLOR: =
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BACKGROUND-COLOR: #ffffff}-----Original Message-----
From: Bi Han [mailto:mike_bihan@xxxxxxxxxxxx]
Sent: Monday, February 10, 2003 13:47
To: Chandrasekhar Arun
Subject: CPW in HFSS, ask for help
Hi:=20
May I ask you a question about cpw in hfss?
Currently, I want to research some problem related to On-Si-chip =
CPW(coplanar wave guide) problem. But have some difficulty in port setup =
in HFSS and some other things.=20
My issue is that how to define those two side grounds of CPW ?=20
Since they(side grounds) are seperated by the signal line and will not =
have opportunity to contact each other, how to define they two to be =
grounds in the same time?
Do you have some example project to help me?
Thanks!=20
B.H.
Bi,Hai =20
SJTU, Emlab
=20
=20
---------------------------------
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=BF=EC=C0=D6=BD=DA=C8=D5=BA=C3=C0=F1=C1=AC=C1=AC!"> ATTACHMENT part 2 =
application/vnd.ms-powerpoint name=3Dport_tutorial_CPW.ppt=20
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