SAW Delay Line Simulation with Large Number of IDT Pairs

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Hello,

I am trying to simulate a SAW delay line device in COMSOL with 100 IDT pairs on each side (input and output). Since modeling the full geometry with all these pairs would be very large and computationally expensive, I tried to simplify the model.

Currently, I built the geometry with only one IDT pair and applied periodic boundary conditions on both lateral sides of the device, assuming that this would mimic the effect of multiple pairs.

However, I am not sure if this approach is physically correct for a delay line with so many electrodes. Also, the results I am getting contain a lot of noise, which makes me wonder if my simplification is not valid.

My questions are:

Is it physically correct to model only one IDT pair with periodic conditions to represent many pairs in a SAW delay line?

Are there better approaches in COMSOL to simulate a large number of IDTs (e.g., 100 pairs per side) without building the full geometry explicitly?

Could the noise I observe be related to this simplification?

Any guidance or references would be very helpful.

Thank you!


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