Abstract
In this paper, the propagation characteristics and reflectivities of TeO2 grating/128° Y–X LiNbO3, 36° Y–X LiTaO3, and 5° Y–X LiNbO3 are analyzed and applied to resonators and, conventional and dispersive unidirectional transducers. Theoretical results of thin film gratings show the large impedance ratio, for example, thin film grating shows r=0.96 at a thickness of H/λ=0.01, for 128° Y–X LiNbO3. The experimental results for an interdigital transducer (IDT) resonator of thin film/Al/128° Y–X LiNbO3 with N=100,W=20λ,H/λ=0.01 show an admittance of 1.0 S. The experimental unidirectional transducer filter using thin film TeO2 (H/λ=0.015)/Al/128° Y–X LiNbO3 show a 1.6 dB insertion loss at 500 MHz without matching. Moreover filters with the phase linear, flat wide band, and low loss characteristics are developed using dispersive unidirectional IDT.
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