Creating a SAW Finger Pair using Geometric Shapes


Surface acoustic wave (SAW) filters utilise interdigital transducers on a piezoelectric substrate, where an input transducer converts an electrical signal to an acoustic wave. The propagated mechanical energy is converted back to an electrical signal at the output; the output of the filter is dependent on the frequency response of the device, which OnScale enables engineers to analyse in 3D to determine full device performance.

This video demonstrates how to create a simple 3D model of a SAW device. In it, we have modeled a saw finger pair. SAW devices are usually made up of many of these pairs which create the interdigital transducers (IDTs). 

Note: If you wish to create a full SAW device, you can use OnScale's patterning feature to pattern out this SAW finger pair.

This video covers: 

  • Geometry creation
  • Material assignment
  • Time function definition
  • Mesh settings
  • Pressure loading
  • Outputs requests
  • Simulation set up 
  • Running on the cloud, downloading results and post processing the results 



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  • What is "alumg" in material? What is the difference between alum and alumg?

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  • Hi Dengyu,

    There is no difference between the materials 'alum' and 'alumg' we added the material aluminium to the project material list and copied it calling it alumg so it is exactly the same as alum in regards to material properties. 'Alumg' in this case would refer to 'aluminium ground'.

    Creating a copy of the material made it easier to identify parts to assign boundary conditions to.

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