Ferromagnetic tridisk-coupled resonator and magnetically tunable stripline Y circulator

Author

Nagao, Tsukasa ; Tanaka, Zengo

Author_Institution

Dept. of Electr. Eng., Nat. Defense Acad., Kanagawa, Japan

Volume

40

Issue

9

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

1812

Lastpage

1820

Abstract

A ferromagnetic tri-disk-coupled (TDC) resonator is constructed by placing three YIG ferrite disks mutually attached on the circular center conductor. The EM fields in one of the disks is described in terms of expanded circular harmonics with an approximated transformation of derivative, and the EM fields in a TDC resonator is synthesized from the respective constituent fields of the disks, by sum-transformation, regarding three eigenjunctures of the TEC resonator. The synthesized fields include coefficients A, B, and D, which are described as functions of the radis ratio r₀/r and azimuthal angle φ. The special case in which A=D=0 is treated. Two conditional equations of perfect Y circulation are calculated. Magnetically tunable operation is theoretically analyzed using the conditional curves, and the magnetically tunable operation is examined experimentally with theoretical analysis

Keywords

circulators (microwave); eigenvalues and eigenfunctions; electromagnetic fields; ferrite devices; resonators; strip line components; tuning; yttrium compounds; EM fields; YFe5O12; YIG ferrite disks; eigenjunctures; expanded circular harmonics; ferromagnetic type; magnetically tunable operation; microwave devices; stripline Y circulator; tridisk-coupled resonator; Azimuthal angle; Equations; Ferrites; Impedance; Magnetic analysis; Magnetic anisotropy; Magnetic resonance; Optical resonators; Perpendicular magnetic anisotropy; Stripline;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.156609

Filename

156609