How to use simultaneously straight wave and oblique wave radiation in COMSOL 4.3?

Hi everyone!

I am using COMSOL to simulate the acoustic lens system.

I am experiencing problems in the use of simultaneous straight waves and oblique waves radiation on the same plane in Acoustics Module in COMSOL (2D).

Can anyone give me some hints for this problem?

Thank you very much !

Tran Quang Dat