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Insertion loss (S21) of SAW devices on 128°YX-LiNbO3 substrate.
Posted 14 nov. 2020, 04:00 UTC−5 Piezoelectric Devices Version 5.4 1 Reply
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Hi, I have a question regarding simulating the insertion loss (S21) of surface acoustic wave devices on 128°YX-LiNbO3 substrate in COMSOL. I have established a SAW device with dual port delay line structure in the Structural Mechanics-Piezoelectric Devices module, and I want to know the conditions to be added to obtain its insertion loss and the detailed operation method. Also, I would like to know how to set 128° YX-LiNbO3 and I have obtained its Euler Angle, density, elastic matrix, coupling matrix, relative dielectric constant (just for stress-charge type).
Thanks in advance for your help.
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Make Terminal 1 a voltage source and terminate Terminal 2 in a resistor. You can look up the definition of S21 in terms of voltages and currents on the web or in one of the usual textbooks.
For the rotated cut- don't forget that Comsol rotates the coordinate system, not the material.