Double-slotted Blade Loaded Slow Wave Structure Used In Microwave Tubes

Micro-vacuum electron devices (μVED) have been experiencing tremendous growth in recent years and become one of the most attractive research areas in vacuum electronics. As an example, impressive achievements in growing research of novel interaction circuits used in μVED were gained. μVED combines the mechanism of vacuum electron devices and the advantages of micro-fabrication technology, therefore it can not only operate at high frequency and high power in a wide temperature range, as well as in high radiation environments, but also offer precise, low-cost, high-repeatability miniature circuit to meet the tight tolerances for high frequency devices.A slow-wave structure is an important component of traveling-wave tubes, where electromagnetic wave interacts with electron beams. The growth of the communications industry has imposed a demand for high frequency and microscale. Recent development in micro-fabrication has provided new opportunities for fabricating micro-vacuum electron devices, especially with vane-loaded slow-wave structure. Today in the research and development of TWT, developing the TWT according to the experiment is the primary way. The main disadvantages of this method is time consuming and costly. To improve the current way of developing TWT the computer-aided design (CAD) is necessary.The mechanism of vane-loaded slow-wave structure is presented in this thesis. The cold characteristics such as dispersion, coupling impedance and attenuation were analyzed. Study of the TWT slow-wave circuit using software is important in TWT CAD. Using electromagnetic field simulation programs MAFIA and Microwave Studio, simulation of dispersion characteristics and coupling impedance of the vane-loaded slow-wave structure was carried out. The effects of different geometric parameters on dispersion and impedance were discussed.The analysis methods can be applied to the study of other types of slow-wave structures, which is a good preparation for further simulation. The research results can be very useful in designing work on microwave tube, especially in millimeter and sub-millimeter range, and can be used as a guide to the design and development of practical devices.