[SI-LIST] Re: Rogers4003 Board Characterization
- From: "Weinberg, Richard \(Richard\)" <rweinberg@xxxxxxxxx>
- To: <ryan.satrom@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 13 Apr 2006 20:08:40 -0400
I've seen the problem as you describe in microstrip. The solder mask was
not accounted for in the original calculations, that set the impedance
off 3-4 ohms. In the lab the line looked very lossy.
The cure was to pull back the solder mask and use Au finish.
Richard Weinberg
Agere Systems
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of ryansatrom
Sent: Thursday, April 13, 2006 5:51 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Rogers4003 Board Characterization
To All-
I am currently doing some characterization work on a Rogers4003=20
board with microstrip and stripline traces. I use a 40GHz VNA, and=20
HFSS for 3D modeling of the launch structures, and AWR Microwave=20
Office for 2D constant cross-section structures and time-domain=20
measurements.
Most literature specifies the dielectric of Rogers4003 to be 3.38,=20
and loss tangent =3D3D 0.0027. From measurement, it looks like I am=20
getting a dielectric closer to about 3.7. (I used a TDR plot, Group=20
Delay plot, and measured the quarter-wave resonance to determine=20
wavelength - then used that to find dielectric).
Also, it seems to be very difficult to find good correlation between=20
simulation and measurement of traces longer than 1-2" above 5GHz. =20
It seems the measurements show MUCH more loss than simulation.
So my questions are:
1) Is 3.38 typically used for R4003 dielectric?
2) Has anybody verified this with lab data?
3) Can I expect correlation above 5GHz between=20
simulation/measurement, or is that as good as I can hope for?
Thanks,
Ryan Satrom
RF Engineer
Everett Charles Technologies
ryan.satrom@xxxxxxxxxxx
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=20
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