Density-modulated phononic membranes

Dennis Høj (Inventor), Ulrich Hoff (Inventor), Ulrik Andersen (Inventor)

Research output: Patent

79 Downloads (Pure)


The invention relates to a mechanical oscillator device comprising an unsupported membrane with a multitude of discrete mass elements distributed to form Phononic crystal cells in the form of regions of additional mass each comprising a plurality of mass elements. The phononic crystal structure has a defect for confining a mechanical oscillation mode having a resonance frequency, f, with the mass elements have a smallest lateral dimension of less than 1/10 of a wavelength of the mechanical oscillation mode. The invention is based on a distribution of tiny additional mass elements providing a periodic density contrast pattern to create the bandgap. This approach keeps the tensile stress uniform which ensures perfect overlap between the tensile stress distribution and mode-shape. This again reduces the damping and thus allows for very high quality factors, Q.

Original languageEnglish
IPCH03H 9/ 24 A I
Patent numberWO2022195083
Filing date19/03/2021
Country/TerritoryInternational Bureau of the World Intellectual Property Organization (WIPO)
Priority date19/03/2021
Priority numberEP20210163818
Publication statusPublished - 22 Sept 2022


Dive into the research topics of 'Density-modulated phononic membranes'. Together they form a unique fingerprint.

Cite this