Investment Rating - The report maintains a "Positive" outlook on the Low Dk electronic fabric industry, highlighting significant growth potential driven by high-speed transmission demands [4][6]. Core Insights - The demand for Low Dk electronic fabric is driven by the need for high-speed transmission, particularly in AI servers and data centers, which are expected to become core growth points for the industry [5][7]. - The Low Dk electronic fabric industry chain presents opportunities across all segments, with a focus on high-barrier core areas such as quartz fiber manufacturing, Low Dk electronic fabric production, and high-frequency copper-clad laminate (CCL) manufacturing [6][8]. Summary by Sections 1. High-Speed Transmission Demand - Low Dk electronic fabric is essential for ensuring the structural safety and signal transmission quality of copper-clad laminates, with data centers and servers being key growth areas [16][18]. - The increasing penetration of AI servers is driving the demand for high-speed switches and optical modules, necessitating the use of Low Dk materials to reduce dielectric loss [23][25]. 2. Industry Chain Highlights - **Upstream**: Quartz fiber is identified as a critical component, with few manufacturers capable of mass production, giving companies like 菲利华 a competitive edge [39][44]. - **Midstream**: Leading manufacturers are rapidly expanding production capacity for Low Dk electronic fabrics, with companies like 中材科技 and 宏和科技 making significant advancements [47][48]. - **Downstream**: Attention is drawn to CCL manufacturers that supply to the NVIDIA chain, as their product development and testing progress will significantly impact market share [5][8]. 3. Recommended Core Stocks - **Upstream**: Focus on quartz fiber suppliers such as 菲利华 [6][17]. - **Midstream**: Monitor companies like 中材科技 and 宏和科技 that are expanding their Low Dk electronic fabric production capabilities [6][18]. - **Downstream**: Keep an eye on high-frequency CCL manufacturers like 生益科技 and 胜宏科技 [6][20].