Extracting Substrate Temperature Dielectric Coefficients Using Split Post Resonators
Split post resonators extract substrate temperature dielectric coefficients by separating thermal expansion dimensional changes from intrinsic permittivity drift.
Resin Matrix Permittivity Temperature Drift Basics in High Frequency Substrates
Matrix thermal permittivity drift alters RF phase velocity and impedance, demanding ceramic-filled low-TcDk laminates for thermally stable millimeter-wave designs.
Dielectric Constant Characterization Methods for High Speed Laminate Selection
Dielectric characterization methods determine in-circuit signal velocity by accounting for test fixture field structure, glass anisotropy, and copper surface roughness.
Phase Delay Instability from Temperature Dependent Glass Matrix Anisotropy in PAM4 Stackups
Temperature-driven phase delay drift in PAM4 stackups stems from the thermal expansion coefficient mismatch between glass fibers and resin matrix.
Z Axis Permittivity Variations in Standard High Speed Multilayer Stackups
Out-of-plane permittivity in glass-reinforced multilayer stackups runs lower than datasheet figures, requiring Z-axis test methods to hold impedance.
Modeling High Frequency Phase Skew from Spatial Resin Gradients in Heterogeneous Substrate Core Packaging
Spatial resin gradients in heterogeneous cores alter localized permittivity, requiring spread-glass selection and off-axis trace routing to control high-frequency phase skew.
In-Situ Quasi-Optical Characterization of High-Frequency Printed Circuit Laminates
Non-destructive quasi-optical characterization captures true millimeter-wave permittivity tensors, preventing costly phase velocity errors before lamination.