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An improved Ka-band microfabricated planar helix slow wave structure (SWS) with straight-edge connections (PH-SEC) together with novel coplanar waveguide (CPW) couplers is proposed. The proposed design is mechanically more stable and is simpler to fabricate. The Eigenmode characteristics of the proposed PH-SEC SWS are provided. The proposed CPW couplers can be fabricated together with one of the layers...
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...
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