Surface acoustic wave resonator, filter, duplexer and communication device utilizing a shear horizontal wave on langasite
AssigneeMurata Manufacturing Co., Ltd.
InventorMichio Kadota
Life of this patent
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Abstract
A surface acoustic wave resonator includes a piezoelectric substrate including a langasite single crystal material and at least one interdigital transducer having at least one pair of comb-shaped electrodes arranged so as to contact the piezoelectric substrate. The surface acoustic wave resonator operates using a surface acoustic wave including an SH wave as the main component.
Claims16
A surface acoustic wave resonator comprising:
- a piezoelectric substrate including a langasite single crystal;
- at least one interdigital transducer having at least one pair of comb-shaped electrodes arranged so as to contact the piezoelectric substrate;
- wherein
- the surface acoustic wave resonator is constructed to operate using one of a Love wave, a leaky wave and a BGS wave as the main component and an edge reflection of the piezoelectric substrate.
A surface acoustic wave resonator comprising:
- a piezoelectric substrate including a langasite single crystal;
- at least one interdigital transducer having at least one pair of comb-shaped electrodes arranged so as to contact the piezoelectric substrate;
- wherein
- the surface acoustic wave resonator is constructed to operate using a surface acoustic wave including a shear horizontal wave as the main component;
- and
- the langasite single crystal has the Euler angle (ø, θ, φ) in the range of:
- 11°≦ø≦24°,
- 17°≦θ≦24°, and
- φ=−1.07ø+90°±5°.
A duplexer comprising at least one surface acoustic wave resonator including:
- a piezoelectric substrate including a langasite single crystal;
- at least one interdigital transducer having at least one pair of comb-shaped electrodes arranged so as to contact the piezoelectric substrate;
- wherein
- the surface acoustic wave resonator is constructed to operate using a surface acoustic wave including a shear horizontal wave as the main component.
A surface acoustic wave resonator comprising:
- a piezoelectric substrate including a langasite single crystal;
- at least one interdigital transducer having at least one pair of comb-shaped electrodes arranged so as to contact the piezoelectric substrate;
- wherein
- the surface acoustic wave resonator is constructed to operate using a surface acoustic wave including a shear horizontal wave as the main component;
- and
- the langasite single crystal has the Euler angle (ø, θ, φ) in the range of:
- 0°≦ø≦30°,
- 153°≦θ≦180°, and
- φ=1.05ø+28°±5°.
A duplexer comprising at least one surface acoustic wave filter which includes at least one surface acoustic wave resonator comprising:
- a piezoelectric substrate including a langasite single crystal;
- at least one interdigital transducer having at least one pair of comb-shaped electrodes arranged so as to contact the piezoelectric substrate;
- wherein
- the surface acoustic wave resonator is constructed to operate using a surface acoustic wave including a shear horizontal wave as the main component.
A transversally coupled surface acoustic wave filter comprising:
- a piezoelectric substrate including a langasite single crystal;
- two interdigital transducers each having a pair of comb-shaped electrodes arranged to contact the piezoelectric substrate;
- wherein the transversally coupled surface acoustic wave filter operates using one of a Love wave, a leaky wave and a BGS wave as the main component and an edge reflection of the piezoelectric substrate.
A transversally coupled surface acoustic wave filter comprising:
- a piezoelectric substrate including a langasite single crystal;
- two interdigital transducers each having a pair of comb-shaped electrodes arranged to contact the piezoelectric substrate;
- wherein the transversally coupled surface acoustic wave filter operates using a surface acoustic wave including a shear horizontal wave as the main component;
- and
- the langasite single crystal has the Euler angle (ø, θ, φ) in the range of:
- 11°≦ø≦24°,
- 17°≦θ≦24°, and
- φ=−1.07ø+90°±5°.
A transversally coupled surface acoustic wave filter comprising:
- a piezoelectric substrate including a langasite single crystal;
- two interdigital transducers each having a pair of comb-shaped electrodes arranged to contact the piezoelectric substrate;
- wherein the transversally coupled surface acoustic wave filter operates using a surface acoustic wave including a shear horizontal wave as the main component;
- and
- the langasite single crystal has the Euler angle (ø, θ, φ) in the range of:
- 0°≦ø≦30°,
- 153°≦θ≦180°, and
- φ=1.05ø+28°±5°.
Dependencies are inferred from the claim text.