[SI-LIST] Re: Insertion Loss, Return Loss, ILD, UNi versus Dual stripline

  • From: "Zabinski, Patrick" <zabinski.patrick@xxxxxxxx>
  • To: "Ken Cantrell" <Ken.Cantrell@xxxxxxxxxxxxxxxx>, "Zabinski, Patrick" <zabinski.patrick@xxxxxxxx>, "Haller, Robert" <rhaller@xxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Thu, 5 Aug 2010 12:35:48 -0500

 
> If you had equal dielectric thicknesses and constant permittivity as
> suggested in my previous post, the dual-strip would have less 
> S21 wouldn't
> it?  ...

Yes; we would.  However, I considered Robert's statement that "... and
they are the Same Copper Geometry (say 4 mil line/7 mil space) and have
the same impedance, same DC resistance ...", which I took to imply that
he changed the dielectric thicknesses to compensate for the constant
line geometries. 

I believe the posed question led us to apply different
interpretations/constraints, thus we ended up with different answers.
If we assumed the same conditions, we probably would end up with the
same result.

Pat


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