行业资讯 Gerber viewer and Cad/Cam program  www.graphicode.com Calculators for trace widths&thickness, Impedance www.ifigure.com Equipment and Calculations for Controlled Impedance    www.polarinstrument.com Autocad viewer for format: DXF, DWG, DNF, CSF www.edrawingsviewer.com Gerber Viewer                    www.gerber-viewer.com/ Dielectric constant (DK) http://www.taconic-add.com/pdf Dissipation Factor (DF) http://en.wikipedia.org/wiki/Dissipation_factor Coefficient of Thermal Expansion (CTE) http://www.pcbdesign007.com/pages/zone.cgi?a=71427 What is a GERBER File? http://circuitpeople.com/Blog/WhatIsAGerberFile.aspx What is FR-4?  http://en.wikipedia.org/wiki/FR-4 Polytetrafluoroethylene(PTFE) Material http://en.wikipedia.org/wiki/PTFE Polyimide(PI) Material http://en.wikipedia.org/wiki/Polyimide

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