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JANUARY 2021 I DESIGN007 MAGAZINE 33 ing physical, electrical, and fabrication param- eters. The laminates for rigid boards come in two basic forms (copper-clad and prepreg) and are built in an alternating fashion from the center of the stackup outward. The prepreg acts as a joining agent between two cores or a core and external copper foil layer. Laminates have physical and electrical parameters which affect performance and the manufacturing process. These laminates and copper foils are supplied in many thicknesses Figure 2: The three elements comprising rigid laminates. Figure 3: Rigid laminate types and a balanced construction method.