Fig. 4.

FE simulation transmission (dashed red) through the six-unit cell metastructures and experimental results (solid blue) for the (A) high-stiffness and (B) low-stiffness metastructures. Results are individually normalized by the structural response at 100 Hz. Black vertical lines indicate band-gap edges calculated from the infinite metastructure dispersion relations, and green vertical lines indicate other modes in the dispersion dictating band gaps in the finite metastructures. Frequencies of these vertical lines are indicated as star data points in Fig. 2. (C) Photograph of experimental setup measuring acceleration along the metastructure length as shown in Movie S1.