AI Article Synopsis
- The study explores the design of one-port SAW resonators that use substrates which exhibit varying degrees of directivity, leveraging the N-SPUDT effect for better performance.
- It discusses different methods to achieve resonance through adjustments in frequency conditions and incorporates techniques involving quarter-wavelength gaps to optimize design.
- Simulation results for the N-SPUDT orientation of langasite show a close agreement with theoretical predictions, particularly for small film thicknesses, although actual reflection coefficients from experiments on Al and Cu films deviate slightly from ideal values.
Article Abstract
We discuss the design of one-port surface acoustic wave (SAW) resonators using substrates with a partial or total degree of directivity, that is, the natural single-phase unidirectional transducer (N-SPUDT) effect. A general design method gives a resonance when all three frequencies (the required resonance frequency and the Bragg frequencies) are different. A second method has been derived from the resonance condition for a symmetrical substrate. Two further methods incorporate lamda/4 gaps. The capacitance ratio is presented as a function of the phase of the electrode reflection coefficient. The simulations use data for the N-SPUDT orientation of langasite. The reflection coefficient for Al electrodes has been calculated from finite element modeling (FEM) analysis. The approximate perturbation theory is found to agree well for small film thickness (h/lamda < 2%). The phase of the reflection coefficient is typically 150 degrees, not quite the ideal value of 180 degrees. Measurements on resonators using Al and Cu films are presented.
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| http://dx.doi.org/10.1109/tuffc.2007.486 | DOI Listing |
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