Ferrite material Characterization Using S-Parameters Data

Material Characterization of Structures Using Genetic Algorithm Vibetarional Data

Composite Material Defects Characterization Using Leaky Lamb Wave Dispersion Data

Leaky Lamb waves (LLW) propagation in composite materials has been studied extensively since it was first observed in 1982. The wave is induced using a pitch-catch arrangement and the plate wave modes are detected by identifying minima in the reflected spectra to obtain the dispersion data. The wave behavior in multi-orientation laminates was well documented and corroborated experimentally with...

Relevant polarimetric parameters for surface characterization using SAR data

The first part of this work introduces the Integral Equation Model (IEM) in order to characterize the polarimetric behaviour of backscattered signals from rough surfaces. In a second step, from the Cloude/Pottier Eigenvector/value based Polarimetric decomposition theorem, polarimetric descriptors sensitive to surface parameters are presented. The particular case of the parameter called anisotro...

Ferrite Material Characterization in a Static Bias Field for the Design of a Tuneable Cavity

During the development of ferrite-loaded accelerating cavities, the electromagnetic properties of the dispersive ferrite material need to be known. We describe a coaxial short-circuit measurement technique to measure the complex permeability of toroidal-shaped samples (127mm outer and 70mm inner diameter) that are exposed to an external magnetic bias field. The external magnetic bias field is a...

Second Harmonic Reduction of Traveling Wave Tube Amplifier Using Ferrite Material

Traveling Wave Tubes (TWTs) consist of different elements. The most important element of TWT is the RF circuit. RF circuits in helix TWTs need a dielectric support to hold the helix; this support also has an effect in electromagnetic properties of RF circuits. A novel dielectric support is proposed to reduce the second harmonic of helix TWTs. The dielectric support in this structure consists of...

Different Ferrite Material Used as Substrate in Microstrip Patch Antenna

it is shown how the radiation characteristic of a patch antenna can be manipulated by a small number of normally magnetized ferrite disks inserted in the resonant region of the patch. It is shown that a oneand dual-band circular polarized microstrip antenna can be obtained by taking advantage of the interaction of the antenna cavity field with the magnetized ferrite disks. . The dependence of t...