Abstract
In studies of transducers, the coupling coefficient serves as a measure of the interaction between the parts of a coupled system and its value is an indication of transducer quality. The literature reveals many definitions of coupling coefficient, the majority of which are consistent but not reconciled. A general definition due to Hersh applicable to mechanical, electrical, and electromechanical systems, tuned and untuned, reciprocal and antireciprocal, is presented. It is shown that this definition leads to the other forms in common use. Several familiar examples of its application to electromechanical systems are considered, and, in particular, the expression for the coupling coefficient of a compound bar resonator is derived.
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