A Ferrite Slow-wave Structure for Backward-wave Applications†

Abstract
The propagation of electromagnetic energy through a small diameter cylindrical waveguide partially filled with a ferrite medium is analysed by a quasi-static approximation, based on Maxwell's equations and the Polder permeability tensor. It is shown that for the passband where the diagonal component of the permeability tensor is negative, a slow HE mode can exist which exhibits characteristics suitable for backward-wave applications. The design parameters are reviewed and an example is given pertinent to a possible S-band backward-wave oscillator.

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