# Piezoelectric Phononic Plates: Retrieving the Frequency Band Structure via All-electric Experiments

## TL;DR

This paper introduces an all-electric experimental method to determine the frequency band structure of piezoelectric phononic plates, demonstrating tunable dispersion and interaction with electric-resonant bands, validated by numerical predictions.

## Contribution

It presents a novel all-electric measurement technique for retrieving the band structure of piezoelectric phononic crystals with tunable dispersion properties.

## Key findings

- Good agreement with finite-element simulations
- Identification of symmetry aspects in band structure
- Observation of Lamb-like mode interactions with electric-resonant bands

## Abstract

We propose an experimental technique based on all-electric measurements to retrieve the frequency response of a one-dimensional piezoelectric phononic crystal plate, structured periodically with millimeter-scaled metallic strips on its two surfaces. The metallic electrodes, used for the excitation of Lamb-like guided modes in the plate, ensure at the same time control of their dispersion by means of externally loaded electric circuits that offer non-destructive tunability in the frequency response of these structures. Our results, in very good agreement with finite-element numerical predictions, reveal interesting symmetry aspects that are employed to analyze the frequency band structure of such crystals. More importantly, Lamb-like guided modes interact with electric-resonant bands induced by inductance loads on the plate, whose form and symmetry are discussed and analyzed in depth, showing unprecedented dispersion characteristics.