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This article reports the design of a high-power ultrasound system, capable of emitting acoustic radiation at 20kHz with SPL peaks up to 160dB at a distance of up to 1m. The main problem of high power airborne ultrasonic systems lies in the acoustic impedance mismatch between the radiator and air. Generally three ways exist to overcome such problem : - exploit an acoustic impedance matching horn (as it is done in audio systems) - enlarge the radiator surface area as much as possible - design an array of radiators It will be shown that the first solution listed above it's not viable for high power ultrasound systems operating in the kHz range, while the second and third are both effective. Furthermore the solution based on a radiator array is the only way to achieve a large focal distance for the US airborne system. The complete design of the US system was developed with COMSOL FEM modules , namely Multiphysics, Structural and Acoustics, with active link to SolidWorks CAD.