[SI-LIST] Re: Propagation delay on embedded microstrip
- From: "Beal, Weston" <weston_beal@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 29 Sep 2004 08:44:25 -0700
Bipin,
You have a buried microstrip. Since the trace is buried inside the dielectric,
and in this geometry the EM field is most contained inside the dielectric the
propagation velocity is very nearly the same as for stripline. The impedance is
not the same. Also, I'm assuming that the dielectric is the same both above and
below the signal layer.
Regards,
Weston
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Bipin Dhavale
Sent: Wednesday, September 29, 2004 3:13 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Propagation delay on embedded microstrip
Hi Everyone,
In the stackup shown below what propagation delay should I consider in Signal
Layer S1 ?
---------------Top (Signal)
---------------S1(Signal)
---------------Plane(Pwr or gnd)
Thickness between Top to S1 is equal to S1 to Plane What would be the best
assumption ?
a] Microstrip
b] Close to microstrip
c] Stripline
d] Close to stripline
e] Inbetween stripline & microstrip
Also If i consider S1 layer as deeply embedded (S1 to Plane >>> Top to S1) Can
I safely consider propagation delays in layer S1 as close to stripline ?
Thank you,
Bipin
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