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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Chen, Z.H. Yamanouchi, K. |
| Copyright Year | 1989 |
| Description | Author affiliation: Res. Inst. of Electr. Common., Tohoku Univ., Sendai, Japan (Chen, Z.H.; Yamanouchi, K.) |
| Abstract | Coupling-of-modes (COM) analysis is applied to the analysis and design of low-loss SAW (surface acoustic wave) filters incorporating SPUDTs (single-phase unidirectional transducers). Coefficients of the COM equation-excluding electrostatic capacitance, which is evaluated by the finite element method (FEM) as an electrostatic problem-are evaluated from four frequencies at the stop band of the dispersion curve of the SAW transducer in open- and short-circuited states, and the FEM was used to evaluate these frequencies. Closed-form expressions for directivity in terms of these coefficients are obtained. Saturation phenomena of directivity under the condition of phi - phi not= pi /4 and the relation between the directivity and the frequencies at the sides of the stop band are described. Experimental results are given for the thickness-difference-type SPUDTs and SAW filters incorporating SPUDTs on 128 degrees Y-X LiNbO/sub 3/. Comparison with experiments shows that the theoretical predictions are quite good. |
| Starting Page | 71 |
| Ending Page | 74 |
| File Size | 341019 |
| Page Count | 4 |
| File Format | |
| DOI | 10.1109/ULTSYM.1989.66961 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1989-10-03 |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Surface acoustic waves Frequency Acoustic transducers Electrostatics Acoustic waves Filters Equations Capacitance Finite element methods Closed-form solution |
| Content Type | Text |
| Resource Type | Article |
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