Abstract
When two different diverging and converging horns are serially connected, it is known that the radiation efficiency is increased in a certain frequency range. Because the radiation efficiency of a sound source system can be improved by increasing the horn input impedance, it is used as the performance index of a horn. The input impedance of a horn system can be calculated by using the transfer matrix under the linear plane wave assumption, considering the flare constant, throat area, and length of the horn to know the acoustic characteristics. Exhaustive calculations varying the design parameters revealed that the serially connected horns can be used as an acoustic device improving the radiation efficiency at a desired frequency range. Optimization of the design variables of the two serially connected exponential horns was conducted to increase the efficiency of the horn‐driver assembly, which is the ratio between the radiated sound power and the input electric power. The optimized result showed that the suggested configuration of the two connected horns is better in efficiency at the target frequency band compared to a single exponential horn by sacrificing the low‐frequency range due to the increased cutoff frequency of the horn. [Work supported by BK21.]
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