High-frequency magnetic microstrip local bandpass filters

Abstract

This paper presents results for a compact, local bandpass filter. We fabricated the filter using two different ferromagnetic materials, Fe and NiFe, in a microstrip geometry. The different values of saturation magnetization of the two ferromagnets give rise to different gyromagnetic resonance frequencies and provide a local bandpass region between them. The results show that the center frequency of the filter can be tuned over a wide range by adjusting the magnitude of the bias magnetic field. The filter’s bandwidth is almost constant (3.5±0.5GHz) over the entire tuning frequency range (6–26GHz). Theoretical calculations are in good agreement with the experimental results.

Evidence of Long-Wavelength Collective Excitations in Magnetic Superlattices

“…Surprisingly, we find both qualitative and quantitative agreement of the experimental data with results of our calculations. The obtained results are stimulating for both further fundamental research of spin dynamics in magnetic superlattices and possible applications in microwave magnetic devices [16].…”

Generalization of Snoek’s law to ferromagnetic films and composites

“…High frequency inductors, 1 magnetic recording write heads, broadband skin antennas, 2 microwave filters, 3,4 noise suppressors 5 and Radar Absorbing materials 6,7 require high broadband permeability levels at elevated frequencies. However, it has been known since the work of Snoek 8 that there exist tradeoffs between high permeability levels and operation at elevated frequencies, i.e.…”

“…Crit_skin_LL31.doc p. 3 28/11/2007 are formulated for particular cases, namely thin films, multilayers, and composite materials. In part IV, the relevancy of the approximations is verified through numerical experiments on an exactly solvable case.…”

Tunable metamaterial bandstop filter based on ferromagnetic resonance

“…1,2 Because of low loss, tunable resonance frequency, wide operating frequency range and high stability, ferromagnetic resonance (FMR)-based bandstop filters, such as yttrium iron garnet (YIG) based filters, have been investigated and realized. [3][4][5][6][7][8][9] Moreover, FMR-based microwave filters contributes to development of monolithic microwave integrated circuits due to low cost and small size. 10 However, most of those filters are composed of microstrip and ferrite structures, which increases the complexity.…”