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AssigneeNational Cheng Kung University
InventorsJUNG-SAN CHEN, TZU-HUEI KUO, WEI-CHUN WANG, WEN-YANG LO, CHENG-YI WANG
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An acoustic metasurface structure is configured to absorb sounds. The acoustic metasurface structure comprises a main body, an externally-connecting configuration and an inner configuration. The externally-connecting configuration and the inner configuration are respectively formed inside the main body. An externally-connecting tube of the externally-connecting configuration is in fluid communication with an external environment and an externally-connecting cavity of the externally-connecting configuration. An inner tube of the inner configuration is in fluid communication with the externally-connecting cavity and an inner cavity of the inner configuration. With the externally-connecting configuration and the inner configuration forming a series-type structure in the main body, the acoustic metasurface structure increases an acoustic impedance. Therefore, under circumstances of the main body having a limited volume, frequencies, on which absorption coefficient peaks of the acoustic metasurface structure land, are lowered, and an absorption coefficient of the acoustic metasurface structure toward low frequencies is increased.
An acoustic metasurface structure comprising:
The acoustic metasurface structure as claimed in claim 2, wherein the two ends of the externally-connecting tube are respectively defined as
Dependencies are inferred from the claim text.