Reflection-type S/N enhancer

Details Reflection-type S/N enhancer Reflection-type S/N enhancer

1997-08-22

1999-03-09

Gensler, Paul

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333 241, H01P 1215

Patent

active

058806512

ABSTRACT:
A reflection-type S/N enhancer includes a Gd.sub.3 Ga.sub.5 O.sub.12 substrate off-angled from a {110} plane. A magnetic thin film including a crystal of garnet is formed on the Gd.sub.3 Ga.sub.5 O.sub.12 substrate by liquid-phase epitaxy. The magnetic thin film has a saturation magnetization in a range of 500 G to 1,100 G. A transducer is operative for exciting magnetostatic wave in the magnetic thin film in response to an RF electric signal. A bias magnetic field is applied to the magnetic thin film. There is a relation as .vertline..theta..sub.1 +.theta..sub.2 .vertline.<45.degree., where ".theta..sub.1 " denotes an angle between a longitudinal direction of the transducer and a <001> orientation of the crystal in the magnetic thin film, and ".theta..sub.2 " denotes an angle between a direction of the bias magnetic field and a transverse direction of the transducer in a horizontal plane. The transverse direction of the transducer is perpendicular to the longitudinal direction thereof.

REFERENCES:
patent: 4595889 (1986-06-01), Stitzer et al.
patent: 5601935 (1997-02-01), Fujino et al.
"A Consideration on MSSW/BVW Hybrid Modes for an S/N Enhancer" by T. Kuki et al; 1996.
"A Signal-To-Noise Enhancer Using Two MSSW Filters and its Application to Noise Reduction in DBS Reception" by T. Nomoto et al; IEEE Transaction on Microwave Theory and Techniques, vol. 41, No. 8, Aug. 1993.
"A Signal-To-Noise Enhancer with Extended Bandwidth Using Two MSSW Filters and and Two 90.degree. Hybrids" by Y. Ishikawa et al: 1994 Asia Pacific Microwave Conference.
"A Reflection Type of MSW Signal-To-Noise Enhancer in the 400-MHz Band" by T. Kuki et al; 1995 IEEE MTT-S Digest.
"Surface Morphologies and Quality of Thick Liquid Phase Epitaxial Garnet Films for Magneto-Optic Devices" by T. Hibiya; Journal of Crystal Growth 62 (1983)87-94; North-Holland Publishing Company.

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