FreeLists / si-list / [SI-LIST] Re: Microstrip/Stripline

["Hassan O. Ali" <hassan@xxxxxxxx>]

Babid, 

You can always find a microstrip line that is more lossy than a stripline. You 
can also 
find a stripline that is more lossy than a microstrip line. You'll have to fix 
some 
parameters of interest and then ask the same question.

For example, you can fix the trace width, trace thickness, dielectric constant, 
electric 
loss tangent, metal conductivity, and characteristic impedance for both line 
types 
(allowing the trace height to vary to give rise to the required characteristic 
impedance). You may also need to specify whether or not the stripline is 
symmetric, i.e. 
the center strip is the same distance from the two reference planes. You should 
also fix 
a frequency band of interest - low frequency loss behavior can be different 
from high 
frequency loss behavior.

In general though, a microstrip is more lossy than a stripline. The fundamental 
reason is 
that a stripline provides two planes through which the return currents could 
pass, hence 
less resistive loss (two resistors in parallel). But at higher frequencies 
where 
dielectric loss dominates over skin-effect (resistive) loss, the story can be 
different. 
That's pretty much material-dependent.

Now go find a book if you need more info.

Best regards.

Hassan. 



On Dec 12, "Tom Dagostino" <tom@xxxxxxxxxxxxx> wrote:
> 
> There are many good books that describe this.  I would suggest you try the
> "Transmission Line Design Handbook" by Brian C. Wadell as a good source.
> 
> Tom Dagostino
> Teraspeed(R) Labs
> 13610 SW Harness Lane
> Beaverton, OR 97008
> 503-430-1065
> tom@xxxxxxxxxxxxx
> www.teraspeed.com
> 
> Teraspeed Consulting Group LLC
> 121 North River Drive
> Narragansett, RI 02882
> 401-284-1827
> 
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Babid A
> Sent: Monday, December 12, 2005 5:44 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Microstrip/Stripline
> 
> 
> Which is more lossy between microstrip and stripline? why?
> 
>   Thanks,
>   -Babid
> 

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