Rigid-Flex boards are printed circuit boards that are formed by areas of rigid parts made of FR4 material linked together with areas of flexible parts made of polyamide material with different thicknesses.
In RF and fast switching circuits, the inductance and capacitance of the printed circuit board conductors become significant, usually unwanted, circuit elements; rather, they can be used as part of the circuit design, as in distributed element filters, antennas, board Rigid-Flex and fuses, avoiding the need for additional separate components.
longer board Rigid-Flex the route or the higher the frequency, the better adaptation is required. When producing the printed circuit with controlled impedance, the impedance will be controlled by acting on the dimensions of the tracks and the distance between them, i.e. the insulation. For a multilayer printed circuit with a specific stack-up,
Among the multi-layer PCBs, the most common are the four-layer ones. The four-layer board has many more routing options in the internal layers compared to the two-layer board, and often part of the internal layers are used as a ground plane or power plane, to achieve board Rigid-Flex better signal integrity, higher
