Analysis of a novel brazed helix tape slow wave structure with high power capability

Summary form only given, as follows. Summary form only given. In order to enhance the power capability of the helix traveling wave tube, a novel helical slow wave structure (SWS) supported by 8 wedge shaped discontinuous dielectric pillars which exist only at the helix tape in each pitch, is developed in this paper. Each pillar can be easily brazed with the helix tape and the metal envelope by means of a special soldering way. This kind of discontinuous support mode can safeguard the dielectric supporting pillar not be broken due to the thermal stress in the case of high temperature. A hybrid model is developed, which can be used to analyze the dispersion characteristics and interaction impedance of the tape helix, by considering the helix radial thickness and the influences of these discontinuous dielectric pillars. The dispersion equation and interaction impedance of this kind of helical SWS are obtained. The numerical calculating results using this hybrid model presented in the paper show good agreements with the HFSS simulation results. All the results presented here can provide a strong basis on design of this kind of novel helical slow wave structure.