Title :
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
fDate :
9/1/1992 12:00:00 AM
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;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
