COMPUTER CONTROLLED SYSTEM FOR COMPLEX PERMEABILITY MEASUREMENT IN THE FREQUENCY RANGE OF 5 Hz − − − − 1 GHz (original) (raw)
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Journal of Applied Physics, 2013
This paper describes the experimental results obtained by a broadband permeability measurement method based on the full-wave electromagnetic (EM) analysis of a non-reciprocal transmission line. The method offers a new experimental tool for measuring the broadband dynamic behavior of ferrites whatever their magnetization state. The methodology and experimental setup are presented with the aim of extracting both the permittivity and the two components (diagonal l and off-diagonal j) of the permeability tensor. Experimental data on commercial ferrites set in different magnetization states are presented and discussed. Furthermore, this method opens perspectives for the determination of other useful magnetic parameters such as resonance linewidth DH. This quantity can be then measured at different frequencies, where conventional resonant methods give a value at a fixed frequency. V C 2013 AIP Publishing LLC. [http://dx.
Progress In Electromagnetics Research B, 2010
This paper presents modeling of the complex permeability spectra, fabrication and a wide frequency range characterization of a toroidal LTCC ferrite sample. A commercial ferrite tape ESL 40012 is used, and standard LTCC (Low Temperature Co-fired Ceramic) processing has been applied to the sample fabrication. The characterization was performed using a short coaxial sample holder and a vector network analyzer in the frequency range from 300 kHz to 1 GHz, at different temperatures. Using the model of the complex permeability spectra dispersion parameters of ferrite LTCC material has been determined for various temperatures. Characteristics of test samples are compared with modeled results and commercially available toroid made of similar NiZn ferrite material.
IEEE Transactions on Electromagnetic Compatibility, 2000
A methodology to efficiently design products based on magneto-dielectric (ferrite) materials with desirable frequency responses that satisfy electromagnetic compatibility and signal integrity requirements over RF and microwave bands is presented here. This methodology is based on an analytical model of a composite magneto-dielectric material with both frequency-dispersive permittivity and permeability. A procedure for extracting complex permittivity and permeability of materials from experimental data is based on transmission line measurements. The genetic algorithm is applied for approximating both permittivity and permeability of materials by series of Debye frequency dependencies, so that they are represented as "double-Debye materials" (DDM). The DDM is incorporated in the finite-difference time-domain numerical codes by the auxiliary differential equation approach.
Measurement of electromagnetic parameters and FDTD modeling of ferrite cores
2009 IEEE International Symposium on Electromagnetic Compatibility, 2009
The paper describes a methodology for an efficient design of novel products based on magneto-dielectric (ferrite) materials with desirable frequency responses that satisfy EMC and SI requirements. The methodology starts from estimating complex permittivity and permeability of these materials. This requires measurement techniques, approximation resultant frequency characteristics for permittivity and permeability using a curve-fitting procedure, and development of a full-wave numerical simulation tool that could deal with frequencydispersive materials. An example of a ferrite material measurement, constitutive parameters extraction using a genetic algorithm, and corresponding FDTD modeling over the frequency range from 10 to 500 MHz is provided.
IEEE Transactions on Magnetics, 2005
Mn-Zn ferrite cores present high permeability within the kilohertz-to-megahertz frequency range. They also present high permittivities within the same frequency range. High permeabilities lead to significant permittivity measurement errors when the conventional two-parallel-electrode method is used. In contrast, high permittivities result in the deviations of measured permeabilities from their intrinsic values. This paper presents a field-circuit coupled method to study each of these two phenomena by examining a ferrite toroid with rectangular cross section. The same toroid is used to construct an inductor and a capacitor, respectively. Analytical expressions for electric and magnetic fields in, and complex power supplied to the inductor and capacitor are formulated. Results are obtained, which show that the measured permeabilities and permittivities for Mn-Zn ferrites deviate from their intrinsic values significantly. A Newton-Raphson method is then introduced to determine the intrinsic permeabilities and permittivities based on their measured values.
Investigation of Magnetic Permeability of Toroidal Cores
Proc. of the 2019 International Symposium on Electromagnetic Compatibility (EMC Europe 2019), Barcelona, Spain, September 2–6, 2019., 2019
This paper describes the procedure for extracting complex permeability for inductive toroidal cores using short coaxial sample holders in the frequency range between 100 Hz and 110 MHz. Extracting complex permeability from measured input impedance is performed based on the inductive behavior of the coaxial holder. Three numerical techniques based on non-uniform transmission line theory, frequency domain finite difference method, and 3D Method of Moments (MoM) are used to verify above methodology. The obtained results are discussed in detail.
Wide Frequency Characterization of Magnetic Properties of Commercial LTCC Ferrite Material
Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT), 2011
Complex magnetic permeability and hysteresis characteristic are key parameters that determine properties of ferrite components. This paper offers effective, accurate and simple method for complex permeability determination of LTCC (Low Temperature Co-fired Ceramic) ferrite sample at wide frequency range (up to 1 GHz). Presented research can be found to be of importance in fields of ferrite components design and application, as well as RF and microwave engineering. The characterization sample is a stack of LTCC tapes forming a toroidal shape structure. Commercially available ferrite tape ESL 40012 was used and standard LTCC processing applied for the sample fabrication. Permeability is determined in the frequency range from 10 kHz to 1 GHz and characterization procedure is divided in two segments - for low and high frequencies. Low frequency measurements (from 10 kHz to 1000 kHz) are performed using LCZ meter and discrete turns of wire, while a short coaxial sample holder and Vector ...
Ferrite Material Characterization Using S-Parameters Data
2017
Since many applications rely on the knowledge of the electromagnetic material properties of ferrites, such as ferrite phase shifters, this paper presents an algorithm for characterizing ferrite materials in a single frequency using a rectangular waveguide system. In this method, the extraction of ferrite parameters is implemented through minimizing the difference between the measured data and the results from modal analysis of the system. The main advantage of this method compared to the other ones is that the proposed method only needs the amplitude of the reflection and transmission coefficients to estimate the parameters of ferrite materials. This makes the implementation easy and eliminates the problems associated with phase calibrations and measurements. This validation is achieved by simulation and experimental tests. The proposed algorithm is validated by characterizing YIG and SL-470 ferrites.
2007
The one-port-circuit impedance method has been used for study and development of novel materials for EW, such as absorbers, in electromagnetic noise suppressors, and current transducers. This method allows the electromagnetic characterization in the frequency range between 100 Hz and 100 MHz. The experimental arrangement implemented in the laboratory was validated using the data obtained from a Ni-Zn ferrite. Based on the expected values for the physical quantities and taking into account the dynamic measuring range of the equipment, it was verified that a limitation of the method is expected for low frequencies. The reliability of both the permeability and permittivity data was certified for frequencies higher than 10 kHz, which was justified from the impedance levels measured on the sample holder used. Discussions are made, about the method and about solutions for using the same in the whole frequency range of the equipment.
Inductive response of ferrites based on resonance effects
Journal of Optoelectronics and Advanced Materials
A method and a setup are presented that allow the investigation of the magneto-inductive phenomenon in the development of position, stress and field sensors, as well as in studying fundamental properties of the used ferromagnetic materials. The phenomenon of resonance in a series RLC circuit is used to study the effect of displacement of the soft ferrite core of the inductor on the peak output voltage across the resistor at resonance. More specifically, the displacement of the core affects the inductance of the circuit and therefore the resonance frequency and the peak output voltage. Several ferrite samples have been used having undergone treatments such as oxidization, annealing and corrosion. The same RLC circuit has also been used to study the effect of applied tensile stress and magnetic field at various frequencies when the core of the inductor is a 25cm long ribbon made of an iron alloy. In this case, the resonance frequency is constant and the output voltage across the resistor is recorded as a function of frequency, stress, and magnetic field. In both cases, the results are correlated to the permeability of the core and the way its permeability changes with respect to the applied stress or field, the frequency of excitation, the treatment it has undergone and its magnetic history. Thus, the presented system may also serve as a tool for determination of the electric and magnetic properties of the under test samples.