Analysis, design, and characterization of ferrite EMI suppressors

Abstract

In this paper design, modeling and characterization of single and double coils, which consist of conductive layer embedded in the soft ferrite material, are described. These surface-mount components, comprising of a cofired multilayered ferrite and coil, have been developed in the ceramic coprocessing technology. A simple analytical model of proposed structures is presented. This model is very suitable for circuit simulations and for prediction of frequency characteristics of considered inductors. The inductance and impedance of coils embedded in low permeability or high permeability ferrite material are calculated and compared. Also, these suppressors were experimentally tested in the frequency range 1 MHz-3 GHz using an Agilent 4287 A RF LCR meter. The calculated results were in good agreement with the measured ones.

Optical, magnetic and electrical investigation of cobalt ferrite nanoparticles synthesized by co-precipitation route

“…Soft magnetic ferrite nanoparticles have critical need for the very high frequency applications such as broadband transformers, filters, antennas and microwave absorbing materials [1,2]. Many scientists have devoted their effort for studying nano-ferrite materials especially those of many technological and industrial applications such as an excellent chemical stability, high mechanical hardness, high Curie temperature, low porosity, high corrosion resistivity, magnetocrystalline anisotropy, magnetostriction, magneto-optical properties and reasonable cost [3][4][5][6][7].…”

The transformation of α-Fe nanoparticles into multi-domain FeNi–M3O4(M = Fe, Ni) heterostructures by galvanic exchange

“…Bulk nickel ferrites have long been studied for their magnetic properties, and are known to be used in electromagnetic interference suppression in electronics. 79 With this in mind, we next studied the magnetic properties of the NiFe-M 3 O 4 NPs by VSM. As shown in Fig.…”

Influence of DC Bias on the Electrical Characteristics of SMD Inductors

“…Real part μ r determines the inductance L = μ r · L 0 , where is L 0 inductance of the inductor in the air, whereas imaginary part μ r dominantly determines the resistance R ≈ μ r · L 0 at higher frequencies (skin effect can be neglected, as it is explained in [13]). Since the permeability is frequency and temperature dependent, the inductor will change its behavior at different working temperatures and frequencies [14].…”