Research Of 8 Millimeter Waveguide To Coaxial Convert, Power Transmit And Detect Technology

The spectrum of millimeter wave is between microwave and infrared wave band. Compared with microwave and infrared, millimeter wave guidance system has high precision, capability of anti-jamming and all day working character. Also millimeter apparatus could be made for a smaller cubage and weight, satisfied for the miniaturization and lighten of applicated electronical device in modern weapon systems. The technology of waveguide to coaxial-cable conversion, power transmission and detection is an important tache of millimeter wave guidance.In this dissertation, each of the 8 millimeter waveguide to coaxial-cable conversion, power transmission and detector discreteness component building blocks is presented. The theory, design and experiment of each subsystem are discussed. Solved small VSWR, low insert loss and cable pliancy problems in waveguide to coaxial-cable conversion discreteness, coupling value, tune technology and detect voltage temperature stability problems in power transmission and detector discreteness. The main context focuses on 4 aspects:Analyzing the field distributing and transmission character of electromagnetic wave in coaxial-cable and metal waveguide is basic theory to confirm transmit power, insert loss and dimension choosing. Giving out the definition and testing theory of reflectance and insert loss, the testing theory of detect voltage. Design testing and experiment methods according to the theory.The conversion theory between coaxial TEM mode to waveguide TE10 mode is basic design theory of 8 millimeter waveguide to coaxial-cable conversion discreteness. Applying theory ofλ/4 coaxial resonance cavity. Simulating all kinds of configurable dimension, the optimal data of key parameter could guide real manufacture. In design frequency, the real testing result of insert loss is 0.7dB.Analyzing theory of 8 millimeter waveguide power transmission and detector discreteness, particular research all kinds of factor effecting capability of the discreteness. Building coupling model in HFSS to simulate and calculate. Calculating filter capability by using ADS. Optimal design the parameter of coupling configuration, resonance cavity, detector and filter according to simulating result. Developing discreteness of stable capability.Researching influence of detect signal caused by all kinds of factors, including tune technology. Simulating the shape, diameter, deepness and material of the screw using for tune. Draw an optimal tune dimension. Analyzing the influence of detect voltage by wave shape distortion and noise. The relationship of temperature and detect voltage is presented. Optimization is carried within several temperature stability designs. The experiment result shows the temperature change ratio of detect voltage is under 10 percent.