Composite Structure
Reinforced fluoropolymer composite provides the low dielectric constant and low dissipation factor required for microwave circuits. Integrating ptfe micro-glass into a substrate involves suspending microscopic glass fibers within a polytetrafluoroethylene resin. These fibers provide dimensional stability while maintaining the electrical performance of the pure polymer.
The material is commonly used in radar systems and satellite communications where signal loss must be kept to a minimum.
Dielectric Performance
Signal integrity depends on the consistency of the material across a wide frequency range. Substrates made of ptfe micro-glass exhibit very low dielectric loss, which allows for efficient signal propagation at frequencies above 20 GHz. The glass reinforcement reduces the thermal expansion of the material, making it more compatible with copper traces during temperature cycles.
Engineers select this material when standard fiberglass substrates cannot meet the attenuation requirements of the design.
Machining Behavior
Material processing describes how the substrate responds to drilling and routing during the fabrication process. Because the resin is soft, ptfe micro-glass can smear over the copper edges if the drill speeds and feeds are not correctly optimized. Fabricators often use specialized drill bits and high-speed spindles to ensure clean holes for plating.
Proper debris removal is also necessary to prevent internal shorts or voids in the plated through holes.
