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    • 2. 发明专利
    • ACOUSTIC DIFFRACTIVE CONCENTRATORS
    • CA3134454A1
    • 2020-09-24
    • CA3134454
    • 2020-03-20
    • ELWHA LLC
    • URZHUMOV YAROSLAV A
    • H01Q3/44H01Q21/06H01Q21/29
    • An acoustically-transmissive structure with a three-dimensional distribution of subwavelength acoustic refractive indices to diffractively concentrate acoustic waves incident on an effective aperture of the structure from a range of incidence directions between a minimum acceptance angle and a maximum acceptance angle to a smaller effective aperture. In a specific embodiment, an acoustic system may include a plurality of electroacoustic transducers and an acoustic structure having a first, larger effective aperture with a three-dimensional distribution of acoustic refractive indices. The acoustic structure diffractively concentrates acoustic waves received at a first set of angles of incidence to a first electroacoustic transducer and diffractively concentrates acoustic waves received at a second set of angles of incidence to a second electroacoustic transducer. The effective apertures of each of the first and second electroacoustic transducers has a smaller effective aperture relative to the larger effective aperture of the acoustic structure.