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Surface acoustic wafe sensors - Out put voltage

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Hi

Is want to simulate a Surface Acoustic Waves (SAW) device. For reducing the problem complexity, I work in 2D in the plane cut indicated in the figure here below (top view of metal lines). A floating potential (grouped) is sensed by an interdigitated electrodes (E2) while a signal is applied of the first one (E1).
My question is: why I have , after my simulation, 6 voltages and not one grouped voltage?


Thanking you for your help.


L.LEE

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