Research Of S-Band High-Power Radial Line Microwave Output Window

High power microwave output window belongs to high power microwave vacuum devices. It is an important part of high power microwave system. Microwave output window has a direct effect on high power microwave system’s vacuum sealing, power capacity, Longevity and reliability. In the process of the microwave output window development, In order to prevent the microwave output window damage and improve the power capacity. People research the structure and materials of the microwave output window ceaselessly and has made certain progress.Due to the advantage of high power radial line array antenna in the aspect of high power microwave than traditional antenna with light quality, small volume, High power microwave source finally must adopt multiple microwave sources lock the frequency superposition, antenna array has a high directivity, and easy to realize the antenna of high gain, high efficiency, high power and circular polarized radiation. So the radial line array antenna get more and more widely used in high power. In order to further increase the power capacity of high-power radial line array antenna, improve and optimize the topological structure of high-power radial line array antenna. It is necessary to design a high power microwave output window suitable for the radial line array antenna.Firstly the paper describes the historical background of the high power microwave output window. To study microwave output window of previous scholars’research. Found that the processing seal are not suitable for high-power radial line array antenna, because of structure or application area. The structure of radial line microwave output window is bound by input coaxial and output coaxial of array antenna feed system. Using ring structure. And do The theoretical analysis of the circular high power microwave output window. Using the pattern matching principle and microwave network theory analysis and calculation circular window of high power microwave output’s S parameter and the microwave model at output window surface. And As to provide theoretical basis for numerical simulation.Secondly, according to the theoretical analysis as a guide, numerical simulation of the radial line circular high power microwave output window. In the process of simulation design we recognize the radial line of microwave output window’s design difficulty:Because of the particularity of the radial line microwave transmission and the triple point to the influence of microwave output window surface field strength. Results the surface of microwave output window’s field is maldistribution. After the analysis of simulation result. We have to adjust the structure of the radial line optimization. We do prominent structures up and down around the triple point of the radial line. In order to re-duce the microwave output surface field and change the field distribution around the microwave output window’s triple point.Finally based on the above research design, we design and process manufacture the circular ceramic microwave output window. As measured by the ceramic microwave output window’s uniform of the circle and simulated conditions of radial line. We design12road the radial line power divider for experimental test. And using the vector network analyzer measured microwave output window’s main features: VSWR insertion loss and degree of unbalance and so on. The result of experimental test indicates that near the center frequency the experimental test results and numerical simulation are basically the same. Achieve a radial array antenna feed system input and output portion’s vacuum sealing. It verifies the feasibility of the radial line microwave output window.