[SI-LIST] uStrip question - repost
- From: "Bill Dempsey" <bdempsey85@xxxxxxxxxxx>
- To: <bdempsey85@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 8 Mar 2004 21:57:29 -0600
--sorry for the repost but the server is adding junk to the message that
made it unclear to read --
I recently built 3 different uStrip construction testboards and was
surprised by the results: it didn't work!
I built two boards as trace over copper with soldermask and one board
as a co-planar waveguide. I constructed the geometries of the boards by
following the results of some "freebie" tools out there.
After the boards were built I connected them to an HP network analyzer
(I calibrated out the cables/cons) to look at S21 response. What I
found was surprising. The S21 was extremely poor: approx 6.5dB loss
over 4". This just does not compare to the results of the tools I have
access to. I expected about 1.2 - 1.5 dB of loss at this frequency.
Has anyone else out there had some bad experiences with uStrip @
2.5GHz? What tools are you using? How are you correlating your
tool's results to real-world?
The construction of the three boards was as follows:
Board 1: 12 mil trace, 1/2 oz foil with 1 oz plating, 8 mil to gnd (three
sheets of 1080 prepreg), 1oz copper gnd
Board 2: (CPW): 8 mil trace, 8 mils to gnd (again, 3 sheets of 1080
prepreg), 6 mil to gnd return on signal layer, same plating/thicknesses
Board 3: 4.75 mil trace, ~2.83 mils to gnd (one sheet of 1080 prepreg),
1/2 oz foil, 1oz plating, 1oz copper gnd
Regards,
Bill
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