Spatial Dielectric Uniformity Metrics in High Frequency Glass Laminates
Spatial dielectric variation in glass laminates stems from weave periodicity and drives phase skew, requiring spread glass or angled routing to pass tight jitter budgets.
PTFE Ceramic Laminate
Composite Dielectric
Specialty substrates composed of polytetrafluoroethylene reinforced with ceramic particles provide high thermal conductivity and low dielectric loss for high-frequency radio applications. Utilizing a ptfe ceramic laminate ensures a stable dielectric constant and extremely low loss tangent across a wide temperature range. This material combines the low-loss properties of fluoropolymer resins with the mechanical stability of inorganic ceramic fillers.
It is widely used in radar systems and high-frequency amplifiers where signal loss must be minimized.
Board Processing
Chemical treatments and drill parameters developed for soft fluoropolymer materials ensure high yield during multi-layer board fabrication. When processing a ptfe ceramic laminate, special plasma or sodium etching is required to prepare the hole walls for copper plating. This preparation is necessary because untreated fluoropolymers are highly chemically inert and do not naturally bond with copper.
Additionally, the soft nature of the substrate requires sharp drill bits and controlled feed rates to avoid copper smear and pad deformation during hole creation.
Mechanical Property
Physical stability under temperature cycles ensures that high frequency boards maintain trace alignment and structural integrity. This composite material exhibits a low coefficient of thermal expansion that matches copper, which reduces stress on plated through-holes. It prevents trace-peeling and ensures the mechanical durability of multi-layer structures.