A.A. Teplykh - Senior Researcher, Saratov branch of the Kotel-nikov Institute of Radio Engineering, and Electronics Russian Academy of Sciences. E-mail: teplykhaa@mail.ru

The ultrasound emitter under study consists of piezoceramic cylinder covered by thin layer of a low-impedance viscoelastic material. Comparison of the radiation pattern of the emitter without a layer and radiation patterns of emitters with covering layer is carried out. It is shown that the presence of a covering layer can result to a significant narrowing of the acoustic radiation pattern generated by the emitter.

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