Hybrid PCB Hi Manager, Lower dielectric constant and lower dielectric loss material are used for PCB can meet the requirement of high frequency high speed signal transmission. In order to get the same performance with competitive advantages, FR-4 is introduced in the multilayer high frequency PCB. Benefits a) SI performance improvement over the stack-ups with all FR4 board; b) Cost reduction over stack-ups with all low loss material. c) Reduce signal loss at high frequencies as well RO4003C+FR4 (example) | --- ---------- Layer 1 (Top layer) 0.018mm+plating | Dielectric RO4003C 0.203mm | ---------- Layer 2 (mid. layer 1) 0.035mm 1.1 mm +/-10% Core FR-4 0.5mm | ---------- Layer 3 (mid. layer 2) 0.035mm | Dielectric FR-4 0.200mm | --- ---------- Layer 4 (Bottom layer) 0.018mm+plating If you have requirements on the hybrid material PCB's, please do not hesitate to contact us by simply reply back to this email. I will get back to you ASAP. Kevin Liao | Business development Bicheng PCB | sales@bichengpcb.com |Material partners: Rogers, ITEQ, SHENGYI, TAIYO, KUANGSHUN If you do not want to receive emails from Bicheng about marketing communications and special offers, reply as “remove” in the subject line. Bicheng is located at Baoan, Shenzhen, China 518103.