Theory of a Passive, Reversible, Distributed-Coupling Transducer

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Abstract
Equations are derived to describe an underwater sound transducer consisting of an acoustical transmission line coupled to a low-pass electrical transmission line. If the two transmission lines have the same phase velocity, the energy of a wave is transferred cyclically from one line to the other as a function of line length; a reversible transducer with a low Q, high efficiency, and essentially constant resistive impedance is thereby achieved. Theory and four proposed designs are described.

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