Fig. 1
From: L-shape triple defects in a phononic crystal for broadband piezoelectric energy harvesting
Design concepts of a double-defect-introduced PnC and corresponding output electric power: a-i a uniform PnC with coupled double defects introduced parallel to incident elastic waves, a-ii broadband PEH by using defect-band splitting, b-i a uniform PnC with differently configured & decoupled double defects, b-ii a graded PnC with identically configured & decoupled double defects, b-iii broadband PEH by closely placing the defect band of each isolated defect