A rigid-flex design combines both elements of a hardboard and a flexible PCB in a single piece. As with conventional PCBs, you can mount components on both sides of the rigid board. Because of the integration that occurs between the rigid and flex circuits, a rigid-flex design does not use connectors or connecting cables between the sections. Instead, the flex circuits electrically connect the system together.
To read more about Rigid Flex PCB designs, the importance of material consideration for such designs, and to explore some design guidelines which can save you from committing costly mistakes, click here.
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Cadence Design Systems