Coaxial Staggered Diaphragm Loaded Slow Wave Line

Along with the development of the modern and high technique war, put forward the new needs to the big power microwave vacuum tube, and provided the good environment for its development. Urge the vacuum electronics instrument to develop towards larger power, broader bandwidth, high-efficiency and high-dependability rapidly. One of the important research fields of the high power microwave is the high power microwave source. To Traveling Wave Tube (TWT), it is the slow-wave structure (SWS) which basically determine the performance of the TWT. In this thesis the coaxial interlaced disk-loaded waveguide is discussed. Because it is a new type all-metal slow-wave structure, so it has advantages of large size, good thermal conductivity, high precision of manufacturing and assembling. In this dissertation, we have made detailed theoretical and experimental study on the high-frequency characteristic of the coaxial interlaced disk-loaded slow-wave structure. Several important and valuable achievement and innovation are listed as the followings: 1. First, we use variation method and Bessel function orthogonality to deduce the dispersion function of the slow-wave structure under the condition of neglecting the thickness of disk. Through the calculation we can see when we change the size parameter of the coaxial interlaced disk-loaded slow-wave structure properly, the dispersion properties will be affected on the different degree. At the same time, we compare this structure with other periodical coaxial disk-loaded slow-wave lines, we can see the coaxial interlaced disk-loaded slow-wave line could get very wide bandwidth (over 50%) and very weak dispersion when select proper parameter. Its characteristic is better than non-interlaced or single-direction coaxial disk-loaded slow-wave lines obviously. 2. For the first time, lead the thickness of disk into the analysis of the coaxial interlaced disk-loaded slow-wave structure. Plot out and calculate the field distributing over again, make use of the strict field matches method to deduce the dispersion function of the structure. Discuss the influence of size parameter to the dispersion properties. Although the bandwidth that think of the thickness of disk is narrow than the bandwidth that not think about the thickness, but its frequency of working is higher than the frequency that not think about the thickness. 3. For the first time study on the coupling impedance of the coaxial interlaced...