POLYMER-COATED SONAR PHASED ANTENNA ARRAY Russian patent published in 2014 - IPC H01Q21/00 H04R1/44 

FIELD: radio engineering, communication.

SUBSTANCE: in a polymer-coated sonar phased antenna array, having piezoelectric elements mounted on a flat base in a housing and having an outer sealing layer on the side of the working surface thereof, made of sound-transparent polyurethane, between the outer sealing layer and the working surface of the piezoelectric elements there is an additional composite sound-transparent coating made of a urethane sealant, having shear losses, the Q-factor of an oscillatory system consisting of a piezoelectric element and an additional sound-transparent layer decreases, thereby expanding the bandwidth. The value of the bandwidth is controlled by the thickness of the layer of urethane sealant, the value of which ranges from λg/8 to λg/4, where λg is the sound wavelength in the sealant material. The outer sealing layer is adhesively bonded to the additional composite sound-transparent coating and the housing.

EFFECT: manufacturable sonar phased antenna array with a given transducer bandwidth and a longer service life.

2 cl, 1 dwg