【作者】 黄辉；

【导师】 尹文言； 王晓金；

【作者基本信息】 上海交通大学 ， 电子与通信工程， 2008， 硕士

【摘要】 毫米波频谱介于微波与红外波段之间,与微波相比,毫米波制导系统具有较高的制导精度和抗干扰性能;与红外相比,具有全天候工作能力。毫米波器件还具有体积小、重量轻的特点,能满足现代武器系统中应用电子设备的小型化、轻量化的要求。8mm波导同轴电缆转换和波导功率传输及检波技术是毫米波制导技术中重要的一环。本论文论述了8mm波导同轴电缆转换和波导功率传输及检波组件的组成结构,以及各分系统的工作原理及其设计方法和试验实施。波导同轴电缆转换组件解决了小驻波、低损耗和电缆的柔软性问题,波导功率传输及检波组件解决了耦合度,调谐技术和检波电压的温度稳定性问题。主要包含以下4个方面的内容:分析电磁波在同轴线和金属波导中的场分布和传输特性,是确定传输功率、插入损耗和尺寸选择的理论基础;给出反射系数和插入损耗的定义及测试原理,检波电压的测试原理,根据测试原理设计电参数测试和试验方法。同轴TEM模式和波导TE10模式相互间转换原理是8mm波导同轴电缆转换组件设计的理论基础,应用了λ/4同轴型谐振腔理论;在Ansoft HFSS仿真软件中进行了各种结构尺寸的仿真,得到最佳关键参量数据并用于指导实际制造;研制出的同轴电缆转换组件在设计频带内,插入损耗实测结果为0.7dB。对8mm波导功率传输及检波组件的机理进行了分析,详细研究了各种因素对组件性能的影响,在HFSS中建立耦合度模型进行仿真计算,并用ADS仿真软件计算滤波器性能,根据计算结果优化设计耦合机构,谐振腔体、检波器、滤波器参数等,研制出性能稳定的传输组件。研究各种因素对检波信号的影响,包括调谐技术,对于调谐用的螺钉形状、直径、深度和材料进行了仿真,得到了最佳调谐尺寸;分析检波波形失真和噪声对检波电压的影响;推导出温度与检波电压的关系式,针对不同温度稳定性方案进行了优选,得到温度特性稳定的产品,试验结果表明检波电压幅值的温度变化率在10%以内。更多还原

【Abstract】 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.更多还原