Surface acoustic wave devices using optimized cuts of lithium niobate (LiNbO3)

A surface acoustic wave device comprising:

• a piezoelectric substrate of a single crystal LiNbO3;
• and
• an electrode pattern provided on a surface of said piezoelectric substrate, wherein said electrode pattern forms a resonator having a resonant frequency and an anti-resonant frequency, the resonator having an electrode thickness in a range of about 0.1% Λ to 8% Λ, where Λ is an acoustic wavelength of a leaky surface acoustic wave which predominately comprises a shear wave component excited on 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 at about the resonant frequency and at about the anti-resonant frequency of the resonator less than 0.01 dB/Λ and an electromechanical coupling factor greater than 0.085.

A surface acoustic wave device comprising:

• a piezoelectric substrate of a single crystal LiNbO3;
• 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 arranged in a least one of a series arm and a parallel arm so as to form a ladder filter structure, each of said resonators having a resonant frequency and an anti-resonant frequency, and wherein the propagation loss of at least one of the resonators is less than 0.01 dB/Λ at about the resonant frequency and at about the anti-resonant frequency, each of said resonators having an electrode thickness in a range of about 4.8% Λ to about 8% Λ, where Λ is acoustic wavelength of a surface acoustic wave excited on a 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,Λ), with angle λ equal to about 0°, angle μ has a value greater than −16° and less than or equal to −10°, and angle θ about 0°.

A surface acoustic wave device comprising:

• a piezoelectric substrate of a single crystal LiNbO3;
• 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 arranged in at least one of a series arm and a parallel arm so as to form a ladder filter structure, each of said resonators having a resonant frequency and an anti-resonant frequency, and wherein the propagation loss of at least one of the resonators is less than 0.01 dB/Λ at about the resonant frequency and at about the anti-resonant frequency, each of said resonators having an electrode thickness in a range of about 0.7% Λ to about 1.3% Λ, where Λ is acoustic wavelength of a surface acoustic wave excited on a 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 equal to less 0°, angle μ has a value greater than −16° and less than or equal to −10°, and angle θ about 0°.

A surface acoustic wave device comprising:

• a piezoelectric substrate of a single crystal LiNbO3;
• 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 arranged in at least one of a series arm and a parallel arm so as to form a ladder filter structure, each of said resonators having a resonant frequency and an anti-resonant frequency, and wherein the propagation loss of at least one of the resonators is less than 0.01 dB/Λ at about the resonant frequency and at about the anti-resonant frequency, each of said resonators having an electrode thickness in a range of about 1.6% Λ to about 2.7% Λ, where Λ is acoustic wavelength of a surface acoustic wave excited on 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 equal to about 0°, angle μ has a value greater than −16° and less than or equal to −10°, and angle θ equal to about 0°.

A surface acoustic wave device comprising:

• a piezoelectric substrate of a single crystal LiNbO3;
• and
• an electrode pattern provided on a surface of said piezoelectric substrate, wherein said electrode pattern forms a resonator having a resonant frequency and an anti-resonant frequency, wherein the propagation loss of the resonator is less than 0.01 dB/Λ at about the resonant frequency and at about the anti-resonant frequency, wherein electrodes within said electrode pattern having an electrode thickness in a range of about 1% Λ to about 8% Λ, where Λ is acoustic wavelength of a surface acoustic wave excited on said piezoelectric substrate, and wherein
• said piezoelectric substrate has an orientation defined by Euler angles (λ,μ,θ), with angles λ and θ equal to about 0°, and angle μ has a value greater than −14° and less than or equal to −10°.