Chapter 42 Summary: PCB Materials Chapter 42 provides a information on the electrical properties of common PCB materials and the characteristics that are of interest to those designing high-performance PCBs. Glass transition temperature, relative dielectric constant, loss tangent, water absorption and fabrication tolerances are discussed. The reader will observe how loss tangent is related to the cost of the PCB, and that fabricators who advocate violating tolerances should provide manufactured examples, not just prototypes.
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