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https://studylib.net/doc/27637455/9470 Acoustic Metamaterial Performance: Double Layer Microperforated Panel Explore the sound absorption of double-layer microperforated acoustic metamaterials (AMM) for low frequencies. Analytical, numerical, experimental analysis. acoustic metamaterialdouble layerperformancemicroperforatedpanel https://www.mdpi.com/2073-8994/15/3/689 Acoustic Metamaterial Design by Phase Delay Derivation Using Transfer Matrix When acoustic elements such as quarter-wave, Helmholtz, labyrinthine-type or hook-type resonators are arranged sequentially, sound waves can be refracted in a... acoustic metamaterialdesign byphase delayderivationusing https://www.metapax.com.tr/ Metapax Akustik - Acoustic Metamaterial Technologies for Audio, Consumer Electronics and Defense Metapax Akustik acoustic metmaterial solutions and ultrasound technologies acoustic metamaterialfor audioconsumer electronicsakustiktechnologies