Use this resource - and many more! - in your textbook!
AcademicPub holds over eight million pieces of educational content for you to mix-and-match your way.
Design considerations on surface acoustic wave resonators with significant internal reflection in interdigital transducers
By: Yamaguchi, M.; Omori, T.; Hashimoto, K.;
2004 / IEEE
This item was taken from the IEEE Periodical ' Design considerations on surface acoustic wave resonators with significant internal reflection in interdigital transducers ' This paper discusses, both qualitatively and quantitatively, the operation and the design principle of current surface acoustic wave (SAW) resonators in which the internal reflection within interdigital transducers (IDTs) is not negligible and lower capacitance ratio is necessary. For the purpose, the p-matrix expression is used with the help of the coupling-of-modes theory. The internal reflection causes: deformation of the IDT passband shape, frequency dependence of the effective SAW velocity within IDTs, and suppression of higher-order resonances. It is shown that these features can be effectively used to enhance performances of both one-port SAW resonators and two-port double-mode SAW (DMS) filters. In addition, under proper designs accounting for the internal reflection, most of all structural discontinuities can be removed, and is most preferable for the reduced scattering loss at the discontinuity. Design criteria also are presented for DMS filters of wide bandwidth, and it is demonstrated how device performances are improved by proper design accounting for the criteria.
Surface Acoustic Wave Resonators
Effective Saw Velocity
Two-port Double-mode Saw Filters
Surface Acoustic Waves
Surface Acoustic Wave Resonator Filters
Acoustic Wave Scattering
Fields, Waves And Electromagnetics