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I was reading about piezo elements and its frequency.

I found on the internet that : The composition of the ceramic material and the shape and volume of the element determine the resonance frequency -- generally, a thicker element has a lower resonance frequency than a thinner element of the same shape. Determining Resonance Frequency

I found also that : At ultrasonic frequencies large surface area parts draw considerable current and resistive heating of the electrodes becomes the limiting factor. Piezo Systems - Frequently Asked Questions

First question, does that mean that if the piezo element is circular has a different frequency as a rectangular piezo element plate when they have the same thickness?

I know that frequency = velocity/(2*thickness)

My second question, what is the relation between frequency of piezo element and its shape?

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  • $\begingroup$ You might just want to look up info on standing wave modes that circles vs. rectangles support, for starters. $\endgroup$ – Carl Witthoft Oct 18 '16 at 13:28

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