title: Fast, precise, and full extraction of the COM parameters for multielectrode-type gratings by periodic Green's function method.
abstract: It is very important to extract all four coupling-of-modes (COM) parameters of the electrode cells for the simulation and optimal design of a low loss surface acoustic wave (SAW) filter. A new approach for fast and full extraction of the COM parameters for multielectrode-type grating is proposed. The field distribution of the wave under the periodic shorted grating is calculated by periodic Green's function method. The phase of the reflection is determined from the positions of the standing wave node. The transduction coefficient and its phase are determined by the charge distribution at low frequency. The COM parameters of the commonly used electrode width controlled (EWC) single phase unidirectional transducer (SPUDT) is computed. It shows that this is a simple and direct way to extract all the COM parameters for SPUDT and, accordingly, is a powerful tool for the optimization of the filter structure.
authors.forename: Jiming
authors.initials: J
authors.lastname: Lin
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.forename: Yongan
authors.initials: Y
authors.lastname: Shui
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D017076:Computer-Aided Design; D004566:Electrodes; D004867:Equipment Design / Q000379:methods; D008962:Models, Theoretical; D011786:Quality Control; D012680:Sensitivity and Specificity; D013685:Telecommunications / Q000295:instrumentation*; D014159:Transducers