| 摘要 |
FIELD: hydro-acoustics. ^ SUBSTANCE: antenna contains rod electro-acoustic transformers, held on common receiving-emitting piece, and also is provided with additional metallic plate, adhesively fastened to receiving-emitting piece across its whole external surface by means of intermediate layer of polymer material, while thickness of metallic plate is 0,01-0,02 of wave length at central working frequency, and thickness of intermediate layer is connected to thickness of metallic plate by following ratio: where i=0,1,2 - indexes, related respectively to substance, metallic plate and intermediate layer, - wave number; lambdai - wave length at central working frequency; li - thickness of layer; rhoi - density of layer material; Ci - speed of sound in material of layer. ^ EFFECT: decreased level of side leaves in wide range of frequencies. ^ 3 dwg |
