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This paper presents transmittance spectra and complex magnetic permeability and dielectric permittivity parameters of pure and mixed powdered barium ferrites, nickel zinc manganese ferrites and nickel cobalt copper ferrites in a broad-band millimeter wave frequency range. A free space, millimeter wave magneto-optical approach has been successfully employed for precise characterization of ferrite materials...
Magnetic powders applications are becoming attractive in electromagnetic shielding interferences in wireless systems. Magnetic powders are also very important in magnetic resonances imaging and as well as the drug delivery applications in biomedical research. As such, a good understanding of the magnetic powders' microwave responses is crucial in modern technological applications. In this paper we...
The concepts of effective permittivity and permeability are used throughout the literature to describe heterogeneous materials, inhomogeneous materials, and small collections of molecules. In this paper we study definitions of the permittivity and permeability based on the microscopic Maxwell's equations and then discuss the ramifications of the common usage of the term "effective".
This paper describes the use of a new resonator using a hybrid Bragg mode (HBM) with azimuthal variations greater than zero. Usually Bragg modes require a pure transverse electric mode with no azimuthal variations and only electric field component, E0. The mode is both Bragg-like, (Er is tangential to all dielectric boundaries) and also whispering gallery-like, (possesses azimuthal variations). This...
We investigate the importance of broadband substrate permittivity and loss tangent data for accurately calculating the frequency-dependent characteristic impedance and propagation constant of ungrounded coplanar waveguides (CPWs). To determine the electrical properties of a CPW, we use a quasi-TEM model that takes into account the effects of non-ideal conductors, substrate loss and finite metallization...
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