Wave-propagation Based Analysis of the Magnetostatic Waves in Ferrite Films Excited by Metallic Transducers

TL;DR

This paper presents a wave-propagation analysis of magnetostatic waves in ferrite films excited by metallic transducers, revealing how transducer properties influence transmission characteristics and device performance.

Contribution

It introduces a wave-propagation based method considering magnetic field inhomogeneities to analyze MSW propagation and device transmission behaviors.

Findings

Metallic transducers cause high insertion losses at high frequencies.

Interference between multiple width modes causes dips and ripples at low frequencies.

Simulations confirm the analysis with good agreement.

Abstract

It is conventional wisdom that the spectra of the impedances of magnetostatic waves (MSWs) determine the transmissions of MSW devices. In this work, we show that the characteristics of propagating MSWs have critical impacts on the characteristics of transmissions. A wave-propagation based analysis considering the inhomogeneous distributions of magnetic fields is presented for investigating the propagations of MSWs. Based on the analysis, it is demonstrated that the metallic nature of transducers causes the high insertion losses in high-frequency bands, while the dips and severe in-band ripples in low-frequency bands are resulted from the complicated interference between the multiple width modes. Simulations in HFSS verify the analysis with good agreements. Our work advances the understanding of MSWs propagating in ferrite films with metallic structures and paves the way to designing MSW devices aimed at implantation in microwave systems.