Half-space radiation high-frequency broadband transducer

The invention provides a half-space radiation high-frequency broadband transducer. The half-space radiation high-frequency broadband transducer comprises a piezoelectric ceramic spherical shell (1), asound barrier plate (3) and a tuning circuit (6), the bottom of the piezoelectric ceramic spherical shell (1) is coated with the sound barrier plate (3), and the angle of the bottom, coated with thesound barrier plate (3), of the piezoelectric ceramic spherical shell (1) is smaller than 180 degrees; the sound barrier plate (3) is provided with a reflection surface (12), and the distance d between the extension line of the reflection surface (12) and the sphere center of the piezoelectric ceramic spherical shell (1) is 0.25 times of the working frequency wavelength lambda. According to the half-space radiation high-frequency broadband transducer provided by the invention, emergent sound waves with the directivity angle of about 180 degrees can be emitted, and the requirement of half-spaceradiation is met; meanwhil