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Appl. Sci. 2018, 8(7), 1083;

Doppler-Based Acoustic Gyrator

Laboratory of Wave Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
Author to whom correspondence should be addressed.
Received: 30 May 2018 / Revised: 27 June 2018 / Accepted: 2 July 2018 / Published: 3 July 2018
(This article belongs to the Special Issue Acoustic Metamaterials)
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Non-reciprocal phase shifters have been attracting a great deal of attention due to their important applications in filtering, isolation, modulation, and mode locking. Here, we demonstrate a non-reciprocal acoustic phase shifter using a simple acoustic waveguide. We show, both analytically and numerically, that when the fluid within the waveguide is biased by a time-independent velocity, the sound waves travelling in forward and backward directions experience different amounts of phase shifts. We further show that the differential phase shift between the forward and backward waves can be conveniently adjusted by changing the imparted bias velocity. Setting the corresponding differential phase shift to 180 degrees, we then realize an acoustic gyrator, which is of paramount importance not only for the network realization of two port components, but also as the building block for the construction of different non-reciprocal devices like isolators and circulators. View Full-Text
Keywords: non-reciprocal acoustics; gyrators; phase shifters; Doppler effect non-reciprocal acoustics; gyrators; phase shifters; Doppler effect

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Zangeneh-Nejad, F.; Fleury, R. Doppler-Based Acoustic Gyrator. Appl. Sci. 2018, 8, 1083.

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