Bicer, AhmetKorozlu, NurettinKaya, Olgun A.Cicek, Ahmet2024-08-042024-08-0420210001-49661520-8524https://doi.org/10.1121/10.0006043https://hdl.handle.net/11616/100196Broad omnidirectional band gaps in a three-dimensional phononic crystal consisting of a face-centered cubic array of spherical air voids connected by cylindrical conduits in solid background are numerically and experimentally demonstrated. With a low material filling fraction of 37.7%, the first bandgap covers 3.1-13.6 kHz frequency range with 126.1% gap-over-midgap ratio. Finite-element method is employed in band structure and numerical transmission analyses. Omnidirectional band gaps are observed in only two-period thick slabs in the 100, 110, and 111 orientations. Experimental transmission characteristics are in good agreement with numerical data. The phononic crystal can be employed in low-frequency sound proofing.& nbsp;(C) 2021 Acoustical Society of Americaeninfo:eu-repo/semantics/closedAccess[No Keywords]Article1503159115963459863710.1121/10.00060432-s2.0-85114497292Q1WOS:000692104700001Q2