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A wideband design of a slow-wave structure (SWS) consisting of planar helix with straight edge connections is proposed here. Dispersion is reduced by placing the metal shield close to the SWS, by including ground planes, and by reducing the amount of dielectric material. The design leads to an octave bandwidth centered at 30 GHz for the ‘cold’ SWS. The design can be implemented using microfabrication...
Backward-wave oscillation is frequently a problem in TWT amplifiers that use the conventional circular helix slow-wave structure (SWS). Circular contra-wound helix SWS, proposed in the past to solve this problem, is hard to fabricate at high frequencies. In this paper, we propose a planar contra-wound planar helix SWS with potential for microfabrication. It is shown with the help of simulated dispersion...
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