美国采购需求：PCB、印刷电路板、PCB组装、PCBA全组装、SMT元件、无源元件采购

We are currently exploring options for transparent flexible PCBs tailored for high-frequency RF applications. Our main requirement is to ensure the material composition minimizes signal loss. Could you share the potential stack-ups and material combinations available in your offerings? We're particularly interested in understanding how your solutions can meet our specifications for low-loss performance.