Microwave Permittivity, Permeability, and Absorption Capability of Ferric Oxide

Broadband Microwave Measurements of Relative Permittivity and Permeability of Materials

A short review of modern techniques for broadband microwave measuring complex permittivity and permeability of materials at broadband microwave frequencies has been presented. Classification of type of the measurement methods to extract the complex permittivity and permeability of bulk materials has been done in this paper. Mathematical models of all the above-mentioned measurement types of met...

Permittivity and permeability of Fe(Tb) nanoparticles and their microwave absorption in the 2â•fi18 GHz range

Microwave permittivity of dry sand

The complex, relative dielectric permittivity " of dry desert sand, collected at the Grand Erg Oriental in Ksar Ghilane, Tunisia, in October 1994, was measured with microwave resonators at frequencies between 0.245 and 6 GHz. The results are presented here. Whereas the real part "0 is nearly independent of frequency, a monotonous decrease of the imaginary part "00 with increasing frequency is o...

Study of the magnetite to maghemite transition using microwave permittivity and permeability measurements.

The microwave cavity perturbation (MCP) technique is used to identify the transition from magnetite (Fe3O4) to the meta-stable form of maghemite (γ-Fe2O3). In this study Fe3O4 was annealed at temperatures from 60 to 300 °C to vary the oxidation. Subsequent to annealing, the complex permittivity and magnetic permeability of the iron oxide powders were measured. The transition to γ-Fe2O3 was corr...

Microwave Nondestructive Testing of Conductive Materials Using Sensor Tuned with Negative Permeability and Permittivity Structure

Microwave nondestructive testing methods become nowadays ever more exploited electromagnetic evaluation method not only dielectric but also metal materials surface and volume homogeneity. A novel microwave sensor created from open waveguide with metamaterial structure for non-destructive testing was developed in an attempt to increase the sensitivity of the microwave nondestructive evaluation m...