Characterization of ferromagnetic materials for microelectronics applications over a wide range of frequencies

Two methods for the accurate evaluation of magnetic constant of ferrite pastes, ferrite epoxies, and ferrite substrates are proposed. The first method, used for the low- to mid-frequency range (DC-100 MHz), is based on current image. The permeability is calculated by measuring the inductance of thick film spiral inductors printed on the magnetic material under test. A frequency-domain coaxial cavity method is used for the mid- to high-frequency range (50 MHz-2 GHz). The complex magnetic constant (complex permeability), and the complex dielectric constant (complex permittivity) are calculated using data obtained by this method.<
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