Hello technet group,
 
    Thanks for all the help with previous questions. My question today
is regarding  grade of FR4.FR4 ( Flame retardant) type 4 indicates woven
glass reinforced epoxy resin.  
 
1. Are there different grades of FR4 used? IF so what are the best
grades to control impedance for RF?
2. Are material specifications the same overseas as it is domestically?
3. Will the different grades give you different impedance levels?
4.  We have no control on our impedance specification,  we are expecting
the grade of FR4 and the process of fabrication to control this,  is
this the right approach? 
 
 
    
 
 
David Harman

 

 

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