SAW Unit Cell 3D

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This is a quick start guide for simulating SAW (Surface Acoustic Wave) filters. In this initial example you will be shown how to get the impedance of a basic Unit Cell SAW created using the symbol language.

What is symbol?: Check out these articles to get more familiar with OnScale's scripting language symbol.

Model Description

This simple unit cell model of a single port SAW filter allows rapid simulation of device performance. The model comprises a pair aluminum electrodes on a piezoelectric substrate. The substrate can either be Lithium Tantalate (LiTaO3) or Lithium Niobate (LiNbO3). The model is set up to simulate a Y-cut, which can be rotated to the desired angle. The base design generates an SH mode at 1.5 GHz using a finger pitch of 1.3 µm.

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Model Schematic

Download and Open the Model

Download: SAW Unit Cell

OnScale Input Files have the file extension *.flxinp. To open the downloaded file:

  1. Open OnScale 
  2. Select Analyst Mode
  3. Select the Menu button in the top left of the application
  4. Select Open

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Preview Model

Preview model is used to view the geometry dimensions and material assignment of a model to ensure the script is correct. To preview a model, select the Preview Model icon in the Home tab of the application ribbon.

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Note: Preview model will display data from any grph commands that come before the prcs command. If you have more than one grph command, you can cycle through the graphics by continuously selecting Preview Model. To close the preview, select Stop Preview.

Run Model on Cloud 

To run the model on the cloud, select the Run on Cloud button in the Home tab of the application and follow these steps:

  1. Click select and open the file you wish to run (saw_unit_3D.flxinp)
  2. Select Estimate
  3. Select Run

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Download Results

  1. From the Home tab, select the Storage icon
  2. Select the Refresh icon to refresh storage
  3. Select the Job Name from the dropdown menu
  4. Select the Download button
  5. Select Download All

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Choose a directory to download the results to. These results will be stored in the folder: saw_unit_3D-YYYYMMDD-HHMMSS\1 where YYYYMMDD-HHMMSS is the current date and time.

Switch to Post Processor

Post Processor is a suite of tools used to visualise and analyse output data generated from OnScale simulations. Switch to Post Post Processor.

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What kind of analysis can I do in Post Processor? Find out here.

Analyse Results

To plot the impedance of the SAW device, follow these steps:

  1. In File Explorer, navigate to the download directory and double click the file 'saw_unit_3D.flxhst' to open it
  2. In Results Manager, select the voltage time history 'pize top:Voltage' by left clicking it
  3. From the Home tab of the ribbon, select the Impedance icon to calculate impedance
  4. In the Frequency History section of the Results Manager, double click 'Impd:top.amp' to plot impedance amplitude
  5. In Plot Controls, tick Log yAxis
  6. In Plot Controls, set xAxis Minimum to 1.4e9
  7. In Plot Controls, set xAxis Maximum to 1.65e9

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What's Next?

Perform a Design Study using this model

Get more familiar with OnScale's 3 Modes and their capabilities

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