Surface acoustic wave filter with an optimizing reflector thickn

Details Surface acoustic wave filter with an optimizing reflector thickn Surface acoustic wave filter with an optimizing reflector thickn

Filed on

1996-04-17

Date issued

1997-04-29

Examiner

Lee, Benny T.

Patent Class

Wave transmission lines and networks

SubClass

Coupling networks

SubSubClass

Electromechanical filter

Other Related Categories

310313A, 310313D, H03H 964

Type

Patent

Status

active

Patent number

056253290

Description

ABSTRACT:
A SAW device formed by providing at least one interdigital transducer on a piezoelectric substrate which is prepared by forming a (1120) ZnO piezoelectric thin film on a (0112) plane .alpha.-Al.sub.2 O.sub.3 substrate, and forming reflectors on both sides of the interdigital transducer along a surface wave propagation direction. Each of the reflectors is so structured that a ratio H/.lambda. of its thickness H to a wavelength .lambda. of a surface wave is in a range of 0.015 to 0.041.

REFERENCES:
patent: 4501987 (1985-02-01), Mitsuyu et al.
patent: 4635009 (1987-01-01), Ebata
patent: 4978879 (1990-12-01), Satoh et al.
patent: 5287036 (1994-02-01), Penunori
Microwave Journal, vol. 23, No. 11, Nov. 1980, Dedham US pp. 22-33, R.D. Colvin, "UHF Acoustic Oscillators".
European Search Report dated Nov. 30, 1994.

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