Acoustic diodes (ADs) have applications ranging from medical imaging to nondestructive testing, but existing ADs change wave frequencies, often leading to poor efficiency. The authors propose a nonlinear AD that preserves frequencies with good forward power transmission, breaking the classical reciprocal-transmission law for linear devices. Its forward, reverse, and breakdown characteristics echo those of electrical diodes, hinting that designs from electronics could be used in acoustics.
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Liu et al. (2015) studied this question.
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