Vane-loaded Helix Slow Wave Structure Characteristics

Since 1943 Kompfner invented the first traveling wave tube, traveling wave tube is widely used in modern military electronic equipments, including communication systems, radars, electronic warfare for its high power, high gain, high efficiency and broad bandwidth. Helical traveling-wave tube is one of the most important types of the microwave/millimeter wave vacuum electronic devices and is widely used for wide bandwidth, simple structure and easy to manufacture. With the development of technology, the two octave helix traveling wave tube has been around maturely developed, while the three octave traveling wave tube is also in the trial.Three new types of helix slow wave structure are studied in this thesis. With the help of the three-dimensional electromagnetic codes HFSS and software TWTC, the three helix slow wave structures are simulated and analyzed deeply.The main work of this thesis:1. Three novel types of helix slow wave structure including half-moon vane loaded helical slow wave system,sector-vane loaded helical slow wave system,concave-vane loaded helical slow wave system are studied. Get the cold-test characteristics of helical slow wave structure according to three-dimensional commercial electromagnetic code Ansoft HFSS.2. Based on the analysis of three types of helical slow wave system, the influence and its causes of vane-loaded, pitch (L), the dielectric constant of the support, the shape and the size of the vane on the cold-test characteristics are discussed in depth.3. Software TWTC is utilized to run the simulations of the three types of helix slow wave structure interaction characteristics with those results analyzed.