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The material properties selection for designing acoustic filters with optimalperformance over a range of frequencies requires considerable effort tofabricate and test laboratory samples. To simplify this procedure, one may testa single sample at various temperatures to design an acoustic filter for adesired band-width. The essential idea is to fabricate a single layeredperiodic elastic composite with constituent materials that havetemperature-dependent properties. As temperature is changed, such a compositeexhibits a band structure that changes with the change in temperature. Once adesired band structure is attained and the corresponding constituent propertiesare identified, then new constituents that have those properties at therequired temperature can be selected and new sample fabricated. We fabricated a2-phase composite with periodic layers of polyurea and steel. The temperatureis changed from -20{\deg}C to 60{\deg}C and ultrasonic measurements areperformed on the sample over 0.15 to 2.2MHz at each temperature. The firstthree pass bands are captured experimentally and significant change in the bandstructure is observed over the test temperature range. Experimentaltransmission spectrum at each temperature is compared with the theoretical bandstructure and it is shown that good agreement exists for the observed variationin the band structure.

Acoustic Filter Design Using Temperature Tuning