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A new free‐wave method for ferrite measurement at millimeter wavelengths
Author(s) -
Cullen Alex L.
Publication year - 1987
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs022i007p01168
Subject(s) - slab , ferrite (magnet) , optics , wavelength , materials science , fresnel equations , permittivity , perpendicular , millimeter , polarization (electrochemistry) , transcendental equation , physics , mathematical analysis , computational physics , dielectric , mathematics , refractive index , geometry , numerical analysis , composite material , optoelectronics , chemistry , geophysics
It is shown that by measurement of the complex Fresnel reflection coefficients of a thick slab of ferrite for both parallel and perpendicular polarization, the complex permittivity and permeability of the ferrite can be found. In case the reflection coefficients are too small to be measured accurately, it is also shown that a slab of arbitrary but known thickness, backed by a metal plate, may be used. The necessary formulas are given for both cases. They are simple and explicit and do not involve the solution of transcendental equations, as might have been expected in the case of the second method proposed.