Microwave Processing of Multilayer Chip Inductors Using MgCuZn Ferrites

摘要

MgCuZn ferrites are synthesized by the microwave-hydrothermal method and are processed with varying concentrations of PbO. The nanocrystalline ferrites are sintered using microwaves at a temperature of 900 °C for 30 min. SEM pictures reveal that the grains are uniformly distributed and the addition of PbO causes a small amount of grain growth. The radio frequency behaviors ( and of the ferrite samples are tested in the frequency range of 1 MHz to 1.8 GHz. The well-densified MgCuZn ferrite with good electromagnetic properties at high frequency is prepared by incorporation of 0.6 wt% PbO. Using this ferrite powder, the multilayer chip inductors (MLCIs) are prepared by the screen printing method. The inductors of 0.56, 0.88, and that exhibit self-resonant frequency of 260–600 MHz are made. The size of these inductors is mm. The inductance and resonant frequency of MLCIs can be adjusted by changing the number of ferrite layers.