Lightweight, Dimensionally Stable Printed-Wiring Boards

Printed-wiring boards (PWBs) that are especially suitable as substrates for highly reliable, lightweight electronic circuits for aircraft and spacecraft have been developed. Like traditional PWBs, these PWBs are laminated composites that include dielectric inner layers plus copper outer layers that can be etched to form signal and power conductors. Going beyond the designs of traditional PWBs, these PWBs include multiple copper layers separated by dielectric (e.g., polyimide) layers, plus inner cores that contain carbon cloth.