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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...
The thermal analysis of a Ka-band slow-wave structure (SWS) consisting of a planar helix with straight edge connections (PH-SEC) has been carried out using CST as well as ANSYS. The thermal loss of the PH-SEC is calculated first and is used as the heat source in the thermal analysis. The temperature profile and the maximum temperature as a function of the dissipated power have been obtained. It is...
A planar slow-wave structure (SWS) for application in traveling-wave tubes (TWTs), unconnected pair of planar helices with straight edge connections (PH-SEC), is presented here. Two versions of the unconnected pair, co-wound and contra-wound, are analyzed and compared for the first time. Analysis for both versions is carried out as special cases of a generic structure consisting of 4 parallel unidirectionally...
A planar helix slow-wave structure which has straight-edge connections has been studied for traveling-wave tube applications. The effects of coplanar ground planes, on the dielectric surfaces which also contain the top and bottom inclined helix strips, are examined. The phase velocity and interaction impedance are studied for two possible planar helix configurations. The coplanar ground planes reduce...
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