Materials for Capacitor Embedding in PWBs

摘要

We have developed a new resin-coated-foil (RCF) material named MCF-HD-45 to be embedded in PWBs to constitute capacitors. The material is composed of a thermosetting resin and a high dielectric constant (Dk) filler. The filler has a multimodal size distribution to attain high loading; a specific surfactant is also essential to preserve the stability of filler dispersion in varnish. These technologies give this material a high Dk of 45 and excellent reliability. In this paper are described the test results for the material applied to a power amplifier module and a low pass filter of cellular phones, as well as the benefit of the database for high frequency circuit simulation.