FreeLists / si-list / [SI-LIST] Re: Loss Tangent of Solder Mask

[ray_waugh@xxxxxxxxxxx]

Michael...

Unless you are forming a transmission line using a conductor over a ground 
plane with solder mask as the dielectric, it does not much matter.  If you are 
concerned about solder mask over the top of a microstrip line (for example), 
the e-fields above the line is so weak that you'll never be able to tell (by 
measurement) if there is solder mask there or not.  We commonly use solder mask 
on our 2 GHz CDMA test boards (on top of microstrip or coplanar waveguide 
lines) and it has no effect whatsoever.

Ray

Raymond W. Waugh
Agilent Technologies

-----Original Message-----
From: Chan, Michael (Eng Hou) [mailto:Michael.Chan@xxxxxx]
Sent: Thursday, March 06, 2003 9:23 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Loss Tangent of Solder Mask


Hi:
    Anybody has any idea what is the loss tangent of solder mask? Thanks.
 
 
Regards,
Michael Chan
H-P Corp.

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