[SI-LIST] Re: length of transmission line in ADS for Z0 modeling

hello Rahul,

For a single isolated TL setup two 1-port circuits with the exact same TL.
The first 1-port is a short circuit TL and yields input impedance of Zsc.
The second is an open circuit TL and yields input impedance of Zoc. It
doesn't matter what length you use for the TL, just assure the two TLs are
exactly the same. Of course, a time domain circuit simulator might run
faster with a bit shorter length :-)

Apply the relation:  Z0 = sqrt(Zoc*Zsc)

You can do the same thing with a 2-port thru TL but this late in the evening
I don't recall off the top of my head what the exact equation is. Let me
know if you want the 2-port thru TL equation and I can send to you later.

You can then setup parameter sweeps (including frequency) and plot all sorts
of parametric variations. Please note this Z0 should be a complex number for
lossy lines.

best regards,
 -Brad Brim

> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx 
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Rahul G
> Sent: Tuesday, November 11, 2008 11:21 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] length of transmission line in ADS for Z0 modeling
> 
> Hello All
> I want to model a microstrip/stripline in ADS to find 
> characteristic impedance using s-parameter simulation. I dont 
> want to use LineCalc...
> I am using multilayer models and give sweep of all parameters 
> (dielectric constant, trace width, height, thickness etc..) 
> and plot Z0 vs impact of each parameter..
> my problem is what should be length of transmission line in 
> simulaiton?  do i need to keep it quarter-wave or any length will do..
> i just need to find mag(s11) and use formula (ZL-Z0)/(ZL+Z0). 
> please correct me, if I am wrong..
> Thanks
> Rahul..

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field


List technical documents are available at:
                http://www.si-list.net

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: