Characterization of Y-Bias Ferrite Materials For Tunable Antenna Applications Using A Partially-Filled Rectangular Waveguide

Junyan Tang, Amin Tayebi, Benjamin Crowgey, Edward Rothwell, Balasubramaniam Shanker, Leo Kempel, Michael Havrilla

Research output: Research - peer-reviewArticle

Abstract

A methodology for measuring the constitutive parameters of a ferrite material is presented. This method can be used to assist the prediction of the properties of tunable antennas that use ferrite material as a substrate or tuning component. A non-traditional characterization method is required due to the general unavailability of samples of a sufficient size to fill the entire cross-sections of waveguides appropriate for lower frequencies where gyromagnetic properties are most pronounced, and the difficulty of predicting or approximating the applied bias magnetic field. The proposed method overcomes the limitation of sample size by requiring only partial filling of a rectangular waveguide. It overcomes a lack of knowledge of the bias field by including the field as an unknown to be determined by the extraction process. The required theoretical reflection and transmission coefficients of the partially-filled waveguide are determined using a mode-matching technique. A nonlinear least squares method is employed to extract the gyromagnetic material parameters and the bias field using optimization algorithms in Matlab. The extracted parameters of a representative commercial ferrite obtained from multiple experimental configurations are compared with the values provided by the sample manufacturer to demonstrate the feasibility of this technique.

LanguageEnglish (US)
JournalIEEE Transactions on Antennas and Propagation
DOIs
StateAccepted/In press - Aug 5 2017

Profile

rectangular waveguides
ferrites
antennas
Rectangular waveguides
Ferrite
Antennas
waveguides
Waveguides
least squares method
tuning
methodology
low frequencies
reflectance
optimization
cross sections
coefficients
configurations
predictions
magnetic fields
Tuning

Keywords

  • Antennas
  • Electromagnetic measurement
  • Ferrites
  • Magnetic materials
  • Optimization
  • Permeability
  • Permittivity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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title = "Characterization of Y-Bias Ferrite Materials For Tunable Antenna Applications Using A Partially-Filled Rectangular Waveguide",
abstract = "A methodology for measuring the constitutive parameters of a ferrite material is presented. This method can be used to assist the prediction of the properties of tunable antennas that use ferrite material as a substrate or tuning component. A non-traditional characterization method is required due to the general unavailability of samples of a sufficient size to fill the entire cross-sections of waveguides appropriate for lower frequencies where gyromagnetic properties are most pronounced, and the difficulty of predicting or approximating the applied bias magnetic field. The proposed method overcomes the limitation of sample size by requiring only partial filling of a rectangular waveguide. It overcomes a lack of knowledge of the bias field by including the field as an unknown to be determined by the extraction process. The required theoretical reflection and transmission coefficients of the partially-filled waveguide are determined using a mode-matching technique. A nonlinear least squares method is employed to extract the gyromagnetic material parameters and the bias field using optimization algorithms in Matlab. The extracted parameters of a representative commercial ferrite obtained from multiple experimental configurations are compared with the values provided by the sample manufacturer to demonstrate the feasibility of this technique.",
keywords = "Antennas, Electromagnetic measurement, Ferrites, Magnetic materials, Optimization, Permeability, Permittivity",
author = "Junyan Tang and Amin Tayebi and Benjamin Crowgey and Edward Rothwell and Balasubramaniam Shanker and Leo Kempel and Michael Havrilla",
year = "2017",
month = "8",
doi = "10.1109/TAP.2017.2736530",
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T1 - Characterization of Y-Bias Ferrite Materials For Tunable Antenna Applications Using A Partially-Filled Rectangular Waveguide

AU - Tang,Junyan

AU - Tayebi,Amin

AU - Crowgey,Benjamin

AU - Rothwell,Edward

AU - Shanker,Balasubramaniam

AU - Kempel,Leo

AU - Havrilla,Michael

PY - 2017/8/5

Y1 - 2017/8/5

N2 - A methodology for measuring the constitutive parameters of a ferrite material is presented. This method can be used to assist the prediction of the properties of tunable antennas that use ferrite material as a substrate or tuning component. A non-traditional characterization method is required due to the general unavailability of samples of a sufficient size to fill the entire cross-sections of waveguides appropriate for lower frequencies where gyromagnetic properties are most pronounced, and the difficulty of predicting or approximating the applied bias magnetic field. The proposed method overcomes the limitation of sample size by requiring only partial filling of a rectangular waveguide. It overcomes a lack of knowledge of the bias field by including the field as an unknown to be determined by the extraction process. The required theoretical reflection and transmission coefficients of the partially-filled waveguide are determined using a mode-matching technique. A nonlinear least squares method is employed to extract the gyromagnetic material parameters and the bias field using optimization algorithms in Matlab. The extracted parameters of a representative commercial ferrite obtained from multiple experimental configurations are compared with the values provided by the sample manufacturer to demonstrate the feasibility of this technique.

AB - A methodology for measuring the constitutive parameters of a ferrite material is presented. This method can be used to assist the prediction of the properties of tunable antennas that use ferrite material as a substrate or tuning component. A non-traditional characterization method is required due to the general unavailability of samples of a sufficient size to fill the entire cross-sections of waveguides appropriate for lower frequencies where gyromagnetic properties are most pronounced, and the difficulty of predicting or approximating the applied bias magnetic field. The proposed method overcomes the limitation of sample size by requiring only partial filling of a rectangular waveguide. It overcomes a lack of knowledge of the bias field by including the field as an unknown to be determined by the extraction process. The required theoretical reflection and transmission coefficients of the partially-filled waveguide are determined using a mode-matching technique. A nonlinear least squares method is employed to extract the gyromagnetic material parameters and the bias field using optimization algorithms in Matlab. The extracted parameters of a representative commercial ferrite obtained from multiple experimental configurations are compared with the values provided by the sample manufacturer to demonstrate the feasibility of this technique.

KW - Antennas

KW - Electromagnetic measurement

KW - Ferrites

KW - Magnetic materials

KW - Optimization

KW - Permeability

KW - Permittivity

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