Abstract
We present a novel propagation medium using a pair of non-identical coupled transmission lines. The medium is referred to as `butterfly' structure and is composed of four coupled transmission lines. These four coupled transmission lines generate higher-order dispersion modes by coupling the modes supported on each of the transmission lines. When these transmission line pairs are placed inside a circular waveguide, they support a strong TM01-like Degenerate Band Edge mode. This property can be used to enhance coupling of the electron beams to RF waves for high-power Traveling Wave Tubes. In this paper, we present the slow wave characteristics and Degenerate Band Edge mode formation using the coupled pair of transmission lines.
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