Velocity, electromechanical coupling factor and acoustic loss of surface shear waves propagating along x-axis on rotated Y-cut plates of LiNbO3

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Velocity, electromechanical coupling factor and acoustic loss of surface shear waves propagating along x-axis on rotated Y-cut plates of LiNbO3

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Velocity and propagation loss of surface shear waves are measured on free-space and metallised surfaces of LiNbO3 crystals along the x-axis of rotated Y-cut plates as a function of rotation about the x-axis between 35° and 70°. The coupling factor obtained from the velocities is 0.20 for a 35° rotated Y-cut plate and 0.09 for a 70° plate. The coupling factor changes linearly with the rotation angle. The propagation losses over the whole range measured here are less than 5 dB/cm on both free-space and on metallised surfaces. These losses are fairly low and very favourable for fabricating s.a.w. filters.

Inspec keywords: lithium compounds; surface acoustic waves

Other keywords: SAW filters; propagation loss; LiNbO3 crystals; surface shear waves; Y cut plates; coupling factor

Subjects: Mechanical and acoustical properties of solid surfaces and interfaces; Acoustic wave devices; Ultrasonics, quantum acoustics, and physical effects of sound

References

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