Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1989-03-17
1990-07-31
Laroche, Eugene R.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333205, 3332192, H01P 120, H01P 1218, H01P 1217
Patent
active
049453246
ABSTRACT:
In a thin film ferromagnetic resonance tuned filter is disclosed which comprises a ferrimagnetic thin films, input and output signal transmission lines respectively coupled with the ferrimagnetic thin films, and a magnetic circuit for applying a DC magnetic field to the ferrimagnetic thin films, the present invention expands the variable frequency band by forming extensions each extending from the signal transmission line so that the distance from the coupling point of the signal transmission line coupled with the corresponding ferrimagnetic thin film to the grounded end thereof is 1/10 or above and less than 1/4 the wavelength of a wave transmitted in the transmission lines at the upper limit frequency of a tuning frequency band. Further the deterioration of the isolation characteristics is suppressed by bending the extended portions not to form parallel portions to another transmission line.
REFERENCES:
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patent: 3611197 (1971-10-01), Moore et al.
patent: 4197517 (1980-04-01), Vittoria
patent: 4500858 (1985-02-01), Mezak
patent: 4679015 (1987-07-01), Murakami et al.
1987 IEEE MTT-S International Microwave Symposium Digest, Jun. 1987, pp. 371-374.
Carter, IRE Transactions on Microwave Theory and Techniques, "Magnetically-Tunable Microwave Filters Using Single-Crystal Yttrium-Iron-Garnet Resonators", pp. 252-260, May 1961.
Simpson et al., The European Microwave Conference, "Tunable Microwave Filters Using YIG Grown by Liquid Phase Epitaxy", pp. 590-594, Sep. 13, 1974.
Mizunuma Yasuyuki
Murakami Yoshikazu
Nakano Hiroyuki
Niikura Kanako
Ohgihara Takahiro
Ham Seung
LaRoche Eugene R.
Sony Corporation
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