One performance measure of in-air ultrasonic radiators, such as wireless\npower transmission, is the power efficiency of the transducers. The efficiency\nof most in-air acoustic radiators is low, even at ultrasonic frequencies; however,\na large radiating plate with steps introduced by Gallego-Juarez et al ., can\nprovide efficient radiation. Their in-air acoustic radiator consists of a Langevin\ntransducer for wave excitation, a mechanical amplifier, and a stepped plate\nwith a large radiating area. This study describes a design processing technique\nfor a stepped-plate radiator developed for optimum energy transmission at\nthe target point in air. The total efficiency required to transfer the acoustic\nenergy was divided into three categories, and the design parameters of each\ncategory were calculated to maximize the efficiency. This design technique allows\noptimum acoustic radiation efficiency and maximum acoustic energy\ntransmission depending on various acoustic energy transfer conditions.
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