高功率毫米波天线双工器研究

【作者】 江浩；

【导师】 李家胤；

【作者基本信息】 电子科技大学 ， 电子科学与技术， 2010， 硕士

【摘要】 高功率微波系统指的是频率在300MHz~300GHz间且峰值功率超过100MW,波长跨越毫米波和厘米波的电磁波产生、传输和辐射系统。军事和工业方面的应用促进了高功率微波相关研究的迅猛发展。近年来微波系统呈现出向高频率、高功率方向发展的趋势。对于功率较高的毫米波系统,传统的在微波传输线路中实现双工的方法已经不再适用,必须应用高功率毫米波天线双工器,在天线内部实现双工。阻燃管,环行器,开关双工器都可以实现双工,但是不能应用于高功率毫米波系统,比较合适的方法是应用金属光栅双工器,其优点是可以克服功率容量的限制。本文研究的是一种金属光栅高功率毫米波天线双工器,其核心器件是一个圆极化器和一个极化分离器。本文首先以自由空间Floquet模理论与平板波导传输理论为基础,推导出单级反射结构的S参数矩阵,编写了相应的数值计算程序。利用该程序对金属光栅结构的高频特性进行分析和验证,进而得到了Ka波段矩形截面的光栅圆极化器和极化分离器的初步设计方案。在此基础上,利用级联模式匹配方法和阶梯近似方法相结合,编制出分析任意截面的反射式周期性光栅的通用程序,对光栅槽的周期、宽度、深度以及入射角度对圆极化器的TE波和TM波的相位差和极化分离器的-1级衍射波束的反射系数的影响进行模拟计算。最后得出抛物线型圆极化器金属光栅在轴比<1.1时,带宽>10%,抛物线型极化分离器TE波的-1级衍射波束的反射参数幅值大于85%。根据所得到的参数用电磁场仿真软件进行仿真,仿真结果比较好的和数值计算的结果相符,证明了数值计算的正确性。优化后的双工器对功率容量和带宽都有了很高的提升。更多还原

【Abstract】 High-power microwave systems generally refers to peak power of more than 100MW, the frequency between 300MHz ~ 300GHz, the wavelength span in the millimeter to centimeter-wave electromagnetic waves between the generation, transmission, and launch systems.The application in military and industry promotes the high-power microwave research has made rapid development. In recent years, microwave system shown to high-frequency, high-power direction of the trend.As the millimeter-wave system power is usually high, the traditional method to achieve duplex in the microwave transmission lines is no longer applicable, must be applied to high-power millimeter wave antenna duplexer, the internal antenna to achieve duplex.Flame tube, circulator, switch duplexer can be realized, but not used in high power millimeter wave systems, more appropriate method is to apply metal grating duplexer, the advantage of the power capacity limits can be overcome. This paper is a kind of metal grating high-power millimeter-wave antenna duplexer, the core device is a polarizer and a polarization splitter. Firstly, in order to free space Floquet-mode theory and the planar waveguide transmission theory, deduced the structure of single-stage reflection S parameter matrix, prepared by the corresponding numerical calculation program. Using this program, high-frequency characteristics of metal grating structure analysis and verification, and then get the Ka-band rectangular grating polarizer and the polarization separator preliminary design.On this basis, using the cascade pattern matching method and the ladder approximation combined analysis of arbitrary cross section of the preparation of a periodic grating reflective common procedures, the period of grating groove width, depth and angle of incidence on the polarizer the TE wave and TM wave phase and polarization separator -1 order diffraction beam reflection coefficient were obtained. The conclusion that the parabolic metal grating polarizer axis ratio <1.1, the bandwidth of> 10%, parabolic splitter TE wave -1 order diffraction beam with parameter amplitude greater than 85%.According to the parameters obtained by electromagnetic simulation software with the simulation results better match the numerical results prove the correctness of the numerical calculation. Duplexer is optimized for power has a high capacity and bandwidth upgrade.更多还原