Application of ferromagnetic composite in different planar tunable microwave devices

10 GHz bandstop microstrip filter using excitation of magnetostatic surface wave in a patterned Ni78Fe22 ferromagnetic film

“…The low-frequency peak of attenuation constant versus frequency can be associated with FMR of a ferromagnetic core. [1][2][3][4][5][6][7][8] The observed frequency shift with respect to the expected thin-film FMR frequency ͑2.4 GHz͒ is partly due to the combination of a high magnetic damping constant and a small width of a signal line, 9 as well as the influence of a high-frequency component ͑peak HF͒. For sample B, the attenuation constant versus frequency demonstrates no low-frequency FMR component but only a high-frequency contribution close to 10 GHz ͓Fig.…”

“…2 On the other hand, for a microstrip with a tangentially ͑in-plane͒ magnetized magnetic core, the effect of the MSSW mode has been ignored; even the possible tracks of these modes can be seen from experimental data. 1,7 In this paper, the attenuation of a quasi-TEM propagating mode due to coupling with MSSWs will be demonstrated for a fully monolithically integrated microstip with a thin-film Ni 78 Fe 22 ferromagnetic ͑FM͒ core with an in-plane magnetization.…”

Driven-Voltage Permeability Variation Measurements of Bilayered Magnetostrictive/Piezoelectric Materials &for Tunable Microwave Applications

“…where the are the piezoelectric coefficients, when no external stress is applied to the material. In the case of a static electric field applied in the direction and (5) where is the Young's modulus in the plane and the deformation in the direction when an electric field is applied in the direction.…”

“…But, because of the well-known limitations of this approach [low signal-to-noise ratio (SNR)], substitute technologies like MEMS [2] and dielectric substrates exhibiting a variable permittivity such as ferroelectrics [3] have been studied. In the same way, a sensitive tunability was performed by inserting magnetic/dielectric composites into a transmission line under a weak static magnetic field [4], [5]. However, the integration of the magnetic control device (coils) is not compatible with the miniaturization of microwave circuits.…”

A broadband permeability measurement of FeTaN lamination stack by the shorted microstrip line method

“…3,4 In order to overcome this obstacle, researchers often deposit soft magnetic thin films on a flexible insulator polymer substrates and glue them together to form a composite material consisting of ferromagnetic films laminated with insulating polymer sheets. 5,6 The fabrication of this kind of soft magnetic lamination stacks makes them a good candidate for highfrequency microwave device applications.…”