  Materials with high dielectric constant are in great demand for the
miniaturization of electronic devices. More specifically, high dielectric
constant polymer-ceramic composites are useful for embedded capacitor
applications. A composite consisting of giant dielectric CaCu3Ti4O12 (CCTO)
incorporated into the Poly(methyl methacrylate) (PMMA) polymer matrix has been
fabricated by melt mixing followed by hot pressing. The composites thus
fabricated has been characterised for structural, morphological and dielectric
properties. The composites dielectric constants had increased when the CCTO
content increased in the PMMA matrix. The dielectric constant of PMMA is around
4.9 @ 100Hz which has increased to 15.7 @ 100Hz when the ceramic content has
increased to 40 Vol %. At low frequencies, space charge polarisation is
dominant. This composite also exhibited remarkably low dielectric loss at high
frequency, which makes this composite a suitable candidate for the capacitors
in high frequency application.
