Cycle Diaphragm Loaded Elliptical Waveguide

Elliptical waveguides have found wide applications in a variety of microwave components: waveguide filters, radiators, resonators, and wide-band transmission lines, etc. Periodic-loaded waveguides play very important roles in high-power microwave tubes, corrugated antennas and linear accelerators. Owing to having the advantages of large size, good thermal conductivity, high precision of manufacturing and assembling, the all-metal slow-wave structures are widely used in the wide-band, high power Traveling Wave Tube (TWT) and relativistic TWT. Furthermore, the disc-loaded cylindrical waveguide is one of the most important slow-wave structures in the all-metal slow-wave structures (SWS). Periodic structures involving elliptical section have received limited attention thus far. In the dissertation, The RF characteristics of the periodically iris-loaded elliptical waveguide used in slow-wave structure is discussed. The structure has potential applications to high-power microwave devices and filtering networks at millimeter wave frequencies. The major achievements are listed as the followings:Mathieu functions remain difficult to employ, mainly because of the impossibility of analytically representing them in a simple and handy way. The methods for the computation of all Mathieu functions of integer orders for large range of the order n and the parameter q were presented here. The calculations were made by programs using Matlab to compute the Mathieu functions. The visualization of Mathieu functions was presented by three-dimensional surface.The slow-wave characteristics neglecting and taking account of space harmonics (SH) for periodically iris-loaded confocal elliptical waveguides are analysed, and the dispersion equation and the mean coupling impedance of this structure are obtained by...