Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – High frequency waveguides – resonators – electrical networks,...
Patent
1998-02-20
2000-10-31
Lee, Benny T.
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
High frequency waveguides, resonators, electrical networks,...
505211, 505700, 505866, 333 99005, 333205, 3332192, 333235, 333161, 333 11, H01P 1217, H01P 1387, H01P 708, H01B 1202
Patent
active
061415715
ABSTRACT:
In a ferrite switchable microwave device, a magnetic structure is formed in a nearly continuous closed-loop configuration of a single crystal material, or of a material exhibiting the magnetic properties of single crystal materials (quasi-single crystal materials). A magnetization M is induced in the structure. The toroidal shape of the structure in combination with the properties of the magnetic material results in a device which exhibits virtually no hysteresis. The device is operable either in a fully magnetized state or in a partially magnetized state. In a fully magnetized state, the device operates in the region of magnetic saturation. The absence of hysteresis in the device enables switching between the positive and negative magnetic saturation points with very little energy. In a partially magnetized state, the device provides a variable magnetization M between the two saturation points. The magnetization curve is made linear and therefore controllable by introducing a gap or other demagnetizing feature in the magnetic structure. This device is particularly operable as a variable phase shifter or tunable filter where the magnetization controls the velocity of electromagnetic energy propagating in the magnetic device.
REFERENCES:
patent: 3257629 (1966-06-01), Kornreich et al.
patent: 3304519 (1967-02-01), Weiss
patent: 4853660 (1989-08-01), Schloemann
patent: 5484765 (1996-01-01), Dionne et al.
patent: 5770546 (1998-06-01), Grothe et al.
W.J. Ince, et al., "Phasers and Time Delay Elements," Advances in Microwaves, vol. 4, pp. 115-119, 85-96 (1969).
G.F. Dionne, et al., "Ferrite-Superconductor Devices for Advanced Microwave Applications," IEEE Transactions on Microwave theory and Techniques, vol. 44(7):1361-1367 (Jul. 1996).
G.F. Dionne, et al., "A Ferrite Bonding Method with Magnetic Continuity," IEEE Transactions on Magnetics, vol. Mag-22(5):620-622 (Sep. 1986).
W.H. Von Aulock, "Selection of Ferrite Materials for Microwave Device Applications," IEEE Transactions on Magnetics, vol. Mag-2, No. 3:251-255 664-673 (Sep. 1966).
T. Min, et al., "Bicrystal Advanced Thin-Film Media for High Density Recording," J. Appl. Phys. 75(10):6129-6131 (May 15, 1994).
"Magnetic Properties of Vapor Grown Crystals of Hexagonal Chromium Telluride," J. Phys. Chem. Solids, vol. 34, pp. 1453-1455 (1973).
Y.S. Shur, et al., "Domain Structure and Magnetic Hysteresis in Single-Crystal MnBi Films," Sov. Phys. Solid State, 17(4):627-628 (1975).
Y.A. Sluzhbin, et al., "Magnetooptical Apparatus for Recording the Hysteresis Loop of Epitaxial Films of Rare-Earth Ferrite Garnets," Donets Physico-Technical Institute, Academy of Sciences of the Ukrainian SSR. Translated from Pribory i Tekhnika Eksperimenta, No. 3, pp. 156-158, May-Jun., 1983. Original article submitted Sep. 28, 1981 (1983).
M. Tsutsumi, et al., "Magnetically Tunable Superconductor Filters Using Yttrium Iron Garnet Films," IEEE Transactions on Magentics, 31(6):3467-3469 (Nov. 1995).
C.D. Mee, "The Physics of Magnetic Recording," IBM Research Center, Yorktown, New York, Fomerly with CBS Laboratories, Stamford, Connecticut, pp. 2-3 (1664).
J.A. Weiss, et al., "The Ring-Network Circulator for Integrated Circuits: Theory and Experiments," IEEE Transactions on Microwave Theory and Techniques, 43(12):2743-2748 (Dec. 1995).
A.G. Glushchenko, et al., "The Use of Thin Single-Crystal Mg-Mn Ferrite Films in Microwave Microstrip Transmission Lines," pp. 106-108 (Jan. 16, 1974).
H.J. Williams, et al., "A Simple Domain Structure in an Iron Crystal Showing a Direct Correlation with the Magnetization," Physical Review, vol. 75(1):178-183 (Jan. 1, 1949).
J.K. Galt, "Motion of a Ferromagnetic Domain Wall in Fe.sub.3 O.sub.4," Physical Review, vol. 85(4):664-669 (Feb. 15, 1952).
F.B. Hagedorn, et al., "Domain Wall Mobility in Single-Crystal Yittrium Iron Garnet," Journal of Applied Physics, Supplement to vol. 32(3):282S-283S (Mar. 1961).
G.T. Roome, et al., "Session V: Microwave Integrated Circuits," 1968 International Solid-State Circuits Conference, Digest of Technical Papers, ISSCC University Museum/Univ. of Pennsylvania, pp. 52-53 (Feb. 15, 1968).
K.K Chow, et al., "Ferromagnetic Resonance Effects Under Mode-Segregation Conditions," Journal of Applied Physics, vol. 38(3):1411-1412 (Mar. 1, 1967).
V.A. Babko, "Losses During Remagnetization in Single Crystals of Substituted Ferrite Garnets Y.sub.3 Fe.sub.5-x Ga.sub.x O.sub.12 ", pp. 1029-1030, T.G. Shevchenko Kiev State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 140-141 (Jul. 1974).
Lee Benny T.
Massachusetts Institute of Technology
LandOfFree
Magnetically tunable ferrite microwave devices does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetically tunable ferrite microwave devices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetically tunable ferrite microwave devices will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2064207