Euler Angles Rotation in SAW Modeling
Application ID: 69281
In the surface acoustic waves industry different crystal cuts of piezoelectric materials are used, e.g. 128ᵒ YX LiNbO3, AT&ST quartz, 42ᵒ YX LiTaO3, etc. Direct data isn’t available for all cuts. The standard approach is to use the so-called Euler angle rotation. COMSOL supports it via the Rotated System functionality. When performing such a rotation, one should keep in mind that it’s inherently 3D, therefore some extra manipulations might be needed for different orientations of piezo crystals in geometry.
Here, some special 2D & 3D cases conversion from the default “Lithium Niobate” material to “128 YX cut LiNbO3” are demonstrated on a simple piezoelectric unit cell. Verification is performed for a simple unit cell model aiming to obtain SAW eigenfrequencies and a typical SAW velocity.
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® and
- either the Acoustics Module, MEMS Module, or Structural Mechanics Module
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 Specification Chart 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.