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Coupling coefficient of resonators
The coupling coefficient of resonators is a dimensionless value that characterizes interaction of two resonators. Coupling coefficients are used in resonator filter theory. Resonators may be both electromagnetic and acoustic. Coupling coefficients together with resonant frequencies and external quality factors of resonators are the generalized parameters of filters. In order to adjust the frequency response of the filter it is sufficient to optimize only these generalized parameters.
== Evolution of the term ==
This term was first introduced in filter theory by M Dishal 〔Dishal, M. (Sept. 1949) "Design of dissipative band-pass filters producing desired exact amplitude-frequency characteristics", ''Proc. IRE'', Vol. 37, No. 9, P. 1050–1069.〕. In some degree it is an analog of coupling coefficient of coupled inductors. Meaning of this term has been improved many times with progress in theory of coupled resonators and filters. Later definitions of the coupling coefficient are generalizations or refinements of preceding definitions.
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