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Spatial power combining of two Ka-band microfabricated traveling wave tubes (TWTs) is reported. The TWTs are based on planar helix slow-wave structure with straight-edge connections (PH-SEC). Transition from a waveguide to the PH-SEC forms the basis for division of input power from a waveguide to the TWTs and for combining the output power into a waveguide. For a 3.7 KV and 10 mA beam, the PIC simulation...
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...
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