[SI-LIST] uStrip question - repost

["Bill Dempsey" <bdempsey85@xxxxxxxxxxx>]

--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

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List technical documents are available at:
                http://www.si-list.org

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

• Follow-Ups:
  • [SI-LIST] Re: uStrip question - repost
    • From: Tom Dagostino

• References:
  • [SI-LIST] uStrip question
    • From: bdempsey85

Other related posts:

[SI-LIST] uStrip question - repost

[SI-LIST] Re: uStrip question - repost

[SI-LIST] Re: uStrip question - repost