An analysis of coupled helices is presented, using the transmission line approach and also the field approach, with the objective of providing the tube designer and the microwave circuit engineer with a basis for approximate calculations. Devices based on the presence of only one mode of propagation are briefly described; and methods for establishing such a mode are given. Devices depending on the simultaneous presence of both modes, that is, depending on the beat wave phenomenon, are described; some experimental results are cited in support of the view that a novel and useful class of coupling elements has been discovered.
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Cook et al. (1956) studied this question.
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