Surface acoustic wave devices using optimized cuts of a piezoelectric substrate

A surface acoustic wave device comprising:

• a piezoelectric substrate of a single crystal LiTaO3;
• and
• an electrode pattern provided on a surface of said piezoelectric substrate, wherein said electrode pattern forms a resonator having an electrode thickness in a range of about 1% Λ to about 15% Λ, where Λ is an acoustic wavelength of a leaky surface acoustic wave which predominately comprises a shear wave component excited on said surface of said piezoelectric substrate, and wherein
• said piezoelectric substrate has a non-symmetric orientation defined by Euler angles (λ, μ, θ), wherein one of said angle λ and θ is not equal to zero degrees, and characteristics include a propagation loss less than 0.01 dB/Λ, and an electromechanical coupling factor greater than 0.07.

A surface acoustic wave device comprising:

• a piezoelectric substrate of a single crystal LiTaO3;
• and
• an electrode pattern provided on a surface of said piezoelectric substrate, wherein said electrode pattern forms a resonator having an electrode thickness in a range of about 5% Λ to about 15% Λ, where Λ is an acoustic wavelength of a surface acoustic wave excited on said surface of said piezoelectric substrate, and wherein a primary material component of said electrode comprises Al, and wherein
• said piezoelectric substrate has an orientation defined by Euler angles (λ, μ, θ), with angle λ at or about 0°, angle μ in a range from greater than −44° to less than or equal to −36°, and angle θ at or about 0°.

A surface acoustic wave device comprising:

• a piezoelectric substrate of a single crystal LiTaO3;
• and
• an electrode pattern provided on a surface of said piezoelectric substrate, wherein said electrode pattern forms a resonator having an electrode thickness in a range of about 1.5% Λ to about 2.5% Λ, where Λ is an acoustic wavelength of a surface acoustic wave excited on said surface of said piezoelectric substrate, and wherein a primary material component of said electrode comprises Au, and wherein
• said piezoelectric substrate has an orientation defined by Euler angles (λ, μ, θ), with angle λ at or about 0°, angle μ in a range from greater than −44° to less than or equal to −36°, and angle θ at or about 0°.

A surface acoustic wave device comprising:

• a piezoelectric substrate of a single crystal LiTaO3;
• and
• an electrode pattern provided on a surface of said piezoelectric substrate, wherein said electrode pattern forms a resonator having an electrode thickness in a range of about 3% Λ to about 6% Λ, where Λ is an acoustic wavelength of a surface acoustic wave excited on said surface of said piezoelectric substrate, and wherein a primary material component of said electrode comprises Cu, and wherein
• said piezoelectric substrate has an orientation defined by Euler angles (λ, μ, θ), with angle λ at or about 0°, angle μ in a range from greater than −44° to less than or equal to −36°, and angle θ at or about 0°.

A surface acoustic wave device comprising:

• a piezoelectric substrate of a single crystal LiTaO3;
• and
• an electrode pattern provided on a surface of said piezoelectric substrate, wherein
• said electrode pattern forms a plurality of resonators,
• said plurality of resonators being arranged in either a series arm or a parallel arm forming a ladder type or a lattice type filter, each said resonator having a resonant frequency and an anti-resonant frequency, and the propagation loss of at least one of the resonators being less than 0.01 dB/Λ at about the resonant frequency and at about the anti-resonant frequency, each of said plurality of resonators having an electrode thickness in the range of 9%Λ to 15%Λ, where Λ is an acoustic wavelength of a surface acoustic wave excited on said substrate, and wherein a primary material component of said electrode comprises Al, and wherein
• said piezoelectric substrate has an orientation defined by Euler angles (λ, μ, θ), with angle λ equals about 0°, angle θ equals about 0°, and angle μ is in the range of −45° to −36°.