HYDROACOUSTIC ROD RESONANT ANTENNA Russian patent published in 1995 - IPC

FIELD: receiving narrow band signals for systems with hydroacoustic communication channel. SUBSTANCE: device has housing 2, half-wave resonant rod 5 which is mounted in housing and has piezoelectric transducer 6, half-wave metal waveguide 1 which is connected to housing in its junction surface. Face of waveguide which is positioned inside housing, and face of metal plate without piezoelectric transducer are tightened to each other and free space. Better resonant characteristics of all-metal half-wave waveguide-resonator and position of main resonant rod in air result in decreased losses of acoustic energy and increased sensitivity and selectivity of device. EFFECT: increased selectivity, decreased internal acoustic noises. 1 dwg