Modeling ferrimagnetic resonators

Author

Buswell, Mark

Author_Institution

Hewlett-Packard Co., Santa Rosa, CA, USA

Volume

37

Issue

5

fYear

1989

fDate

5/1/1989 12:00:00 AM

Firstpage

860

Lastpage

867

Abstract

The impedance matrix for an arbitrary n-port ferrimagnetic resonator is derived by applying Poynting´s theorem to a region of space surrounding the resonator. Simplifications to the impedance matrix for low-loss (Q>≈100) ferrite material make it possible to obtain an equivalent circuit model for the resonator, which can be used with most computer-based circuit simulation programs. The circuit model for the general-case polymodal ferrimagnetic resonator consists of a network of single-pole resonators, each of which has a possible non-frequency-dependent, nonreciprocal phase shift. The components of the circuit model are described in terms of the properties of the ferrite material, and the coupling strength of the microwave circuit to the magnetostatic modes of the ferrimagnet. The method is demonstrated in three simple examples, including a one- and two-port loop coupled filter, and a ferrimagnet in a waveguide

Keywords

electric impedance; equivalent circuits; ferrimagnetic resonance; matrix algebra; microwave devices; modelling; resonators; Poynting´s theorem; computer-based circuit simulation programs; coupling strength; equivalent circuit model; ferrimagnetic resonators; impedance matrix; magnetostatic modes; microwave device; nonreciprocal phase shift; single-pole resonators; Coupling circuits; Equivalent circuits; Ferrimagnetic materials; Ferrites; Impedance; Magnetic circuits; Magnetic materials; Magnetic separation; Microwave circuits; Transmission line matrix methods;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.17452

Filename

17452