hi,

one of my customers have built a 4 layers board as follows:



                  ____________________________18 MIC COOPER  (1/2 oz)       
   
                   ========================
                   ========================   3 X 7628
                   ========================    
                   ---------vcc-------35 mic cooper  (1 oz)
                          
                      0.711mm   CORE
                   ----------gnd-------35 mic cooper 
                          SAME AS ABOVE

with multifunctional resin type materials, it's tg is 140 c.

the end-user of this board have not specified any controlled impedance
tracks , BUT some signals do carry 0.7 giga to up to 4 giga !!!

could someone advise what is the dk of the epoxy at those rates,

should other materials be used then std. epoxy resins  (fr4 -gfn)


any comment would be appreciated.
                     


Yisrael Leshman
Octava Marketing
zichron-yaakov
ISRAEL
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