Study And Design Of The .95 Ghz Quasi-optical Mode Converter

With the high-power microwave source to a higher power levels and higher frequency of development of coherent millimeter-wave gyrotron research has become the forefront of international research. For the higher order mode and high power levels, continuous wave output in the form, the traditional waveguide mode converter has been unable to adapt to this situation, the built-in quasi-optical mode converter of research is very necessary.At present, the quasi-optical mode converter has been studied in foreign countries more in-depth, and has equipment to the commercial gyrotron of the domestic research in this area has just started. This paper is in this context, aligned optical mode converter in the theory and design method, based on extensive research on the helical-shaped incision Vlasov launcher and quasi-parabolic mirror, and two amendments to the mirror phase system of quasi-optical mode converter consisting of a numerical simulation and experimental research.This thesis mainly uses the geometric optics theory to analyze the electromagnetic wave in the transmission of images inside the circular waveguide is given Vlasov launcher and quasi-parabolic reflector geometry parameters of the expression. Of the phase correction mirror system works and the design method, based on algorithms of error control KSA and scalar diffraction theory, the preparation of the phase correction mirror adaptive design process, and discussed the beam quality evaluation methods. Designed by numerical simulation 95GHz, input TE62 mode quasi-optical mode converter. The mode converter of radiation from the helical incision Vlasov launcher, quasi-parabolic mirror and polarization phase correction mirror system. Based on the scalar diffraction theory, in-depth discussion of the reference plane at the field distribution. Finally, the results of the numerical simulation of the design process into a kind, the experimental measurements.The results show that the theoretical design method is accurate, you can easily guide the design of quasi-optical mode converter.