Resolving Anisotropic Permittivity in Woven Quartz Fluoropolymer Circuit Substrates
Woven quartz fluoropolymer substrates exhibit directional permittivity splits resolved through tensor modeling, 45-degree layout, and split-post testing.
Clamped Stripline Resonator Method for High Frequency Dielectric Characterization
Clamped stripline resonators extract out-of-plane permittivity and loss tangent up to 10 GHz by measuring resonant modes of unclad dielectric sheets under pressure.
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.
Isotropic versus Anisotropic Dielectric Models in Packaging Substrates
Anisotropic dielectric tensor modeling eliminates up to 8 ohm trace impedance errors and timing skew in high speed package substrates compared to isotropic models.
Selecting Dielectric Substrates for High Speed Multilayer Stackup Design
Selecting dielectric substrates requires balancing dissipation factor, glass weave uniformity, foil roughness, and panel yields to meet high-speed impedance targets.
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.