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Study of Key Techniques on High-power Millimeter Wave Mode Conversion and Transmission

Author: YuXinHua
Tutor: MengLin
School: University of Electronic Science and Technology
Course: Physical Electronics
Keywords: Millimeter waveband High power High efficiency Mode conversion and transmission Gyrotron
CLC: TN015
Type: PhD thesis
Year: 2010
Downloads: 223
Quote: 2
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Abstract


High power millimeter wave system is mainly composed of high-power millimeter wave source, mode conversion and transmission, emission subsystems, the plasma cyclotron resonance heating, have a very wide range of applications in the field of high-resolution radar, directed energy weapons, material handling, belonging International on a hot research topic. In the high-power millimeter-wave systems, millimeter-wave source determines the merits of the system performance, and other components, such as mode conversion and transmission subsystem restricts the effective functioning of the performance of the millimeter-wave source, and therefore of high power, high efficiency millimeter-band mode converter and the key technology of the transition (transfer function) on the full play to the performance of the millimeter-wave source has important significance. In this paper, the key technology for high power, high frequency millimeter wave band mode converter and transition (transformation or transmission efficiency, bandwidth and compactness) theoretical and experimental research. In addition, the W-band gyrotron were some of the theoretical and experimental studies. Research and reflected in the work of this paper are as follows: 1. Use of the coupled-wave theory to study two gradient contour mode converter. An axisymmetrical circular waveguide, the radius of the inner wall thereof for the fluctuations in the periodic perturbation; another for the same inner radius of the circular waveguide with its axis in the same plane as the periodic perturbation. Respectively, can be realized the circular waveguide electromagnetic mode radial and angular changes in the indicators. Simplex optimization algorithms numerical calculation procedure of the preparation of the analysis and optimization of these two mode converter. Prepared calculation program analysis, design TE03-TE02, TE02-TE01 and TE01-TE11 mode converter. Cold, in good agreement with the experimental results and the calculated results of thermal measurements. In order to improve the TE01-TE11 mode converter bandwidth, TE01-TE11 mode converter metamorphosis structure. The calculations show that the abnormal structure mode converter has obvious advantages in conversion efficiency, bandwidth and compactness. 2. Preparation of the analysis of the electromagnetic properties of the waveguide wall mutations numerical calculation program. As an example, we use the program to design a TE11-HE11 mode converter. The same time, in order to estimate its TE11 and TM11 mode power capacity, we also do the power capacity. The experimental and calculated results have good consistency. Under axisymmetric the sinusoidal corrugation outline mode converter principle, to infer the mechanism of the sinusoidal contour transitional work, according to the mechanism proposed several sine wave pattern outline circular waveguide mode converter. Written analysis of their numerical calculation program, they are optimized. Optimized structure parameters developed these transitional and experimental study, the results show that good agreement with the calculation results. 4. Proposed two contours circular waveguide TE01 mode transition, the the TE02 mode approaching deadline and TE01 mode near closing both cases, the efficient transmission of the TE01 mode. Preparation of numerical calculation and optimization program, its optimization analysis. The calculations show that compared with the existing circular waveguide gradual transition transition has the characteristics of high transmission efficiency, compact structure. The good agreement of the experimental and calculated results. 5. Using vector diffraction theory, the theory of quasi-optical written pay Vlasov mode converter program, calculations show that the TE01 mode authentic optical mode converter feed is more conducive to the realization of the conversion to the Gaussian beam. 6 Application Note - wave interaction calculation procedure of the preparation of the analysis of the gradient composite cavity electromagnetic characteristics consistent nonlinear theory, the program for the operating mode TE02-TE03 3mm band composite cavity second harmonic cyclotron lumen body geometry and electromagnetic optimization parameters. Particle simulation software simulation results with the calculated results with good consistency. The experiments show that the composite cavity gyrotron operating frequency of about 94GHz, the peak power of about 156kW, efficiency is higher than 27%, consistent with the calculation and simulation results. Numerical optimization procedures according to the gyrotron Note - wave interaction theory and pattern matching method to write 94GHz the single chamber fundamental cyclotron lumen geometry and electromagnetic parameters, particle simulation power reaches 127kW efficiency of over 47%, the output mode is TE03.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > General issues > Basic theory > Microwave and UHF
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