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Microstrip, Stripline,CPW,and SIW Design
www.qsl.netMaterial Properties • Relative Permittivity ε r (or Dielectric Constant Dk) and Dissipation Factor (Df). - Dk is the property of a material which alters the Electric field in the wave. - Dk = ɛ-jɛ’, where: ɛ = energy stored, and ɛ’ = energy lost. - Materials used in PCB technology generally have Dk from 2 to 10 (Dk is dimensionless). - Generally, dielectric constant Dk, decreases as ...