Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1998-02-03
1999-09-07
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333205, 3332191, 333235, H01P 120, H01P 1217
Patent
active
059493119
ABSTRACT:
In a magnetically-tunable resonator, a wave-guiding structure comprising an electromagnetic frequency filter, or component of such a filter, is placed in sufficient proximity with a magnetic structure so as to be gyromagnetically coupled therewith. The resonator is supportable of two fundamental normal modes of propagation which, in the absence of magnetic interaction are even and odd with respect to the resonator center plane of symmetry. Each normal mode possesses a spectrum of resonance frequencies. When the magnetic structure is magnetized, the formerly even and odd modes become mixed due to gyromagnetic interaction, and the resulting wave fields become elliptically polarized. With appropriate design such that the identities of the modes are preserved under conditions of resonance, this in turn results in a nonreciprocal reinforcement action in the resonator, which leads to the desired shift in resonance frequency in at least one of the two normal modes. The device is especially attractive to application in miniaturized planar microwave devices, for example MMICs, in conferring small size and weight, simplicity of structure, low power required for tuning, capability of fixed, continuous or digitally-stepped frequencies, and low-loss high-Q performance; applicable with superconducting or conventional metallic conductors.
REFERENCES:
patent: H432 (1988-02-01), Mariani et al.
patent: H470 (1988-05-01), Stern et al.
patent: H1408 (1995-01-01), Babbitt et al.
patent: 3986149 (1976-10-01), Harris et al.
patent: 4020429 (1977-04-01), Bickley
patent: 4027253 (1977-05-01), Chiron et al.
patent: 4152677 (1979-05-01), Chiron et al.
patent: 4521753 (1985-06-01), Schloemann
patent: 4816787 (1989-03-01), Stern et al.
patent: 4887054 (1989-12-01), Stern et al.
patent: 5101182 (1992-03-01), Babbitt et al.
patent: 5223808 (1993-06-01), Lee et al.
patent: 5309127 (1994-05-01), Mariani
patent: 5413983 (1995-05-01), Stern et al.
patent: 5426402 (1995-06-01), Mariani
patent: 5448211 (1995-09-01), Mariani
patent: 5770546 (1998-06-01), Grothe et al.
Mesa, F., et al., "Rigurous Analysis of Non-Reciprocal Slow-Wave Planare Transmission Lines," 21 European Conference, 1991, Microwavee Exhibitions and Publishers, 1991, pp. 229-234.
Dionne, G., et al., "Tunabilty of Microstrip Ferrite Resonator in the PArtially MAgnetized State," IEEE Transactions on Magnetics, vol. 33, No. 5, Sep. 1997, pp. 3421-3123.
Dionne Gerald F.
Temme Donald H.
Weiss Jerald A.
Ham Seungsook
Massachusetts Institute of Technology
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