Broad-band microwave characterization of a tri-layer structure using a coaxial discontinuity with applications for magnetic liquids and films

Author

Belhadj-Tahar, Nour-eddine ; Dubrunfaut, Olivier ; Fourrier-Lamer, Arlette

Author_Institution

Lab. de Dispositifs Infrarouge et Microondes, Univ. Pierre et Marie Curie, Paris, France

Volume

46

Issue

12

fYear

1998

fDate

12/1/1998 12:00:00 AM

Firstpage

2109

Lastpage

2116

Abstract

An analytic technique is described, which allows us to determine simultaneously complex permittivity ε and permeability μ of magnetic films or magnetic liquids. The cell is a gap in a coaxial line filled with three layers (for liquid samples, the two external layers are used as windows, and for films, the middle layer constitutes the substrate). Permittivity and permeability of the unknown layer(s) are computed from the S-parameters (S₁₁, S₂₁), which are measured in the gap, taking into account higher order modes excited at the discontinuity, ε and μ measured for ethanol and a ferrofluid (with an applied magnetic static field) are presented up to 18 GHz

Keywords

S-parameters; coaxial cables; inverse problems; magnetic fluids; magnetic permeability measurement; magnetic thin films; microwave measurement; mode matching; permittivity measurement; 18 GHz; S-parameters measurement; applied magnetic static field; broadband microwave characterization; coaxial discontinuity; coaxial line gap; complex permittivity; ethanol; ferrofluid; higher order modes; magnetic films; magnetic liquids; permeability; trilayer structure; Coaxial components; Ethanol; Magnetic analysis; Magnetic field measurement; Magnetic films; Magnetic liquids; Magnetostatics; Permeability measurement; Permittivity measurement; Scattering parameters;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.739291

Filename

739291