hi,

could you possibly mean permittivity rather that permeability?  permittivity is commonly known as dielectric constant. i would expect permeability to be meaningless with fr-4; it isn't ferromagnetic.

phil

-----Original Message-----
From: Barbara Burcham [mailto:[log in to unmask]]
Sent: Friday, May 12, 2000 11:09 AM
To: [log in to unmask]
Subject: [TN] Fr4 Board materials have a permeability of?


I was unclear when I asked this question, earlier.
Can anyone tell me how to find the permability of the FR4 family of board
materials in relationship to frequency?

Barbara Burcham

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