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Optimized cut of LiTaO3 for resonator filters with improved performance

Optimized cut of LiTaO3 for resonator filters with improved performance,10.1109/ULTSYM.2002.1193426,N. Naumenko,B. Abbot

Optimized cut of LiTaO3 for resonator filters with improved performance   (Citations: 4)
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In resonator filters, it is often desirable to minimize propagation loss simultaneously at resonant and anti-resonant frequencies. Using this criterion, we found an optimal dependence of rotation angle on electrode thickness in wavelengths, in rotated YX cuts of LiTaO3 with At grating. In particular, 48°YX cut was found to be optimal for resonator filters with thick Al electrodes, about 10% wavelength. With rotation angle set to be optimal for the specified electrode thickness, the lines of nonsymmetric orientations were located, along which propagation losses at resonant and anti-resonant frequencies do not exceed 0.003 dB/Λ, electromechanical coupling coefficient is higher than 8% and power flow angle does not exceed 5°.
Conference: Ultrasonics, IEEE Symposium - IUS , vol. 1, pp. 385-390 vol.1, 2002
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