Nick KoopFlat or folded, flex circuit designs provide superior impedance performance across a wide spectrum of signal speeds.

Question: Will impedance change when the flex portion of a rigid-flex is bent into place during assembly?

The short answer is no.

When a circuit is bent, the distance from a single-ended or differential pair to the reference planes remains constant, as does the distance between traces in a pair. There is no compression of the dielectric or movement of signal lines. As a result, the impedance remains constant as well. The performance as modeled in the flat condition will continue when bent.

Read more: Maintaining Constant Impedance

Mark Finstad

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How to use smaller pads while maintaining annular ring requirements.

Read more: Drill and Pad Sizing

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