Dielectric property of AlN/PE composite

AlN/PE composite substrate was fabricated by mould pressing. The influences of AlN content and morphology on the dielectric performance were studied and the model for predicting dielectric constant was also discussed, which is well coincident with the experiment results. With increasing of AlN content, the dielectric constant and loss increase gradually. The calculated model for dielectric constant could be described as ε^k = Mathematical bold italic small phi sign₁ε^k₁ + Mathematical bold italic small phi sign₂ε^k₂ + Mathematical bold italic small phi sign₃ε^k₃, in which Mathematical bold italic small phi sign₁, Mathematical bold italic small phi sign₂ and Mathematical bold italic small phi sign₃ are volume fractions of AlN, PE and interstice, and Mathematical bold italic small phi sign₁, Mathematical bold italic small phi sign₂, and Mathematical bold italic small phi sign₃ the corresponding dielectric constants, respectively, k is a constant.