SAW Velocity Calculations from a Unit Cell Model
Application ID: 107661
FEM simulation can be used to obtain a SAW velocity and some related parameters (squared electromechanical coupling coefficient, reflectivity, etc.) for different typical configurations. Such parameters are input data for various analytical and semi-analytical methods of SAW device design, like the Delta-Function model, the COM method, etc.
A unit cell model with periodic conditions and the Eigenfrequency study is the typical setup. In this entry, the unit cell for a center frequency of about 433 MHz on 128ᵒ YX cut LiNbO3 crystal with aluminum IDTs is investigated.
Three configurations are shown:
- Free surface case: No IDT, no electric terminals
- IDT case: Two typical aluminum grounded electrodes
- Grounded surface case: No IDT, the fully grounded surface
This model example illustrates applications of this type that would nominally be built using the following products:
however, additional products may be required to completely define and model it. Furthermore, this example may also be defined and modeled using components from the following product combinations:
- COMSOL Multiphysics® et
- soit le Module Acoustics, Module MEMS, ou Module Structural Mechanics et
- soit le Module AC/DC, Module MEMS, Module Plasma, ou Module Semiconductor
The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Grille des Spécifications and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.