Nonreciprocal cell for the broadband measurement of tensorial permeability of magnetized ferrites: direct problem

Quéffélec, Patrick; Floc’h, M. Le; Gelin, Philippe

doi:10.1109/22.754870

Cited by 29 publications

(21 citation statements)

References 19 publications

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“…In order to correctly interpret the measurements, it is necessary to provide a suitable characterization of the waves inside the waveguide. This is well known for isotropic materials [2,3,12,20], bi-isotropic (chiral) materials [9,17], and even anisotropic materials where an optical axis is along the waveguide axis [1,10,15,16], but for general bianisotropic media with arbitrary axes there are so far very few results available. In principle, an optimization approach as in [12] and [16] can be designed, where the material parameters are found by minimizing the distance between measured and simulated S-parameters.…”

Section: Introductionmentioning

confidence: 99%

Determination of Propagation Constants and Material Data From Waveguide Measurements

Sjöberg¹

2009

PIER B

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Abstract-This paper presents an analysis with the aim of characterizing the electromagnetic properties of an arbitrary linear, bianisotropic material inside a metallic waveguide. The result is that if the number of propagating modes is the same inside and outside the material under test, it is possible to determine the propagation constants of the modes inside the material by using scattering data from two samples with different lengths. Some information can also be obtained on the cross-sectional shape of the modes, but it remains an open question if this information can be used to characterize the material. The method is illustrated by numerical examples, determining the complex permittivity for lossy isotropic and anisotropic materials.

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Section: Introductionmentioning

confidence: 99%

Determination of Propagation Constants and Material Data From Waveguide Measurements

Sjöberg¹

2009

PIER B

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“…In this study we have shown physicochemical and magnetic properties of YIG thin films deposited by a sputtering system. Non-reciprocal effects are obtained in a X-band rectangular waveguide and can be used [5] to characterize the permeability tensor of such films. …”

Section: Resultsmentioning

confidence: 99%

“…these non-reciprocal effects are a new results obtained with such thickness. They are sufficient to be used in a microwave characterization method of anisotropic materials to explore the permeability tensor of such ferrite films [5].…”

Section: Microwave Results and Discussionmentioning

confidence: 99%

Microwave characterization of magnetic thin films

Nader

Boudiar

Bayard

et al. 2004

phys. stat. sol. (c)

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An issue of current research is the integration of microwave ferrite devices with semiconductor technologies by using vacuum deposition techniques. Thin magnetic films may be used in commercial products and they can be more easily involved in the development of magnetic devices if we are able to extract their magnetic properties. One of the interesting points of this paper is to highlight the properties of a thin film, such as anisotropic behavior to release non reciprocal devices. A study of physicochemical and magnetic properties is tackled and experimental results are discussed.

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“…Benefits over alternative methods, such as free-space systems, include the availability of analytical expressions to describe sample interrogation, high signal strength, and the simplicity of manufacturing rectangular samples [6][7][8][9]. The S-parameters measured with a material sample placed in the cross-sectional plane of a waveguide may be used to determine the complex values of the permittivity, = 0 ( r − j r ), and the permeability, μ = μ 0 (μ r − jμ r ), from closed-form expressions [13,14].…”

Section: Introductionmentioning

confidence: 99%

A Waveguide Verification Standard Design Procedure for the Microwave Characterization of Magnetic Materials

Crowgey

Tang

Rothwell

et al. 2015

PIER

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Abstract-A waveguide standard is introduced for validation purposes on the measurement accuracy of electric and magnetic properties of materials at microwave frequencies. The standard acts as a surrogate material with both electric and magnetic properties and is useful for verifying systems designed to characterize engineered materials using the Nicolson-Ross-Weir technique. A genetic algorithm is used to optimize the all-metallic structure to produce a surrogate with both relative permittivity and permeability within a target range across S-band. A mode-matching approach allows the user to predict the material properties with high accuracy, and thus compensate for differences in geometry due to loose fabrication tolerances or limited availability of component parts. The mode-matching method also allows the user to design standards that may be used within other measurement bands. An example standard is characterized experimentally, the errors due to uncertainties in measured dimensions and to experimental repeatability are explored, and the usefulness of the standard as a verification tool is validated.

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Nonreciprocal cell for the broadband measurement of tensorial permeability of magnetized ferrites: direct problem

Cited by 29 publications

References 19 publications

Determination of Propagation Constants and Material Data From Waveguide Measurements

Determination of Propagation Constants and Material Data From Waveguide Measurements

Microwave characterization of magnetic thin films

A Waveguide Verification Standard Design Procedure for the Microwave Characterization of Magnetic Materials

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