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基于毫米波准光模式传输和变换理论,详细研究了准光模式激励器通过波纹喇叭天线、准抛物柱面反射器和同轴开放式谐振腔激励圆极化高阶目标模式的原理。分析了W波段波纹喇叭天线产生准高斯模式HE11的过程;利用几何射线法研究了准抛物反射面天线作为腔体辐射馈源的设计方法;通过小孔耦合理论研究了侧壁开孔的三段式同轴谐振腔激励高阶模式的机理。同时,该文还优化设计了工作模式为TE62模,工作中心频率为94.8 GHz的准光模式激励器,使用三维电磁仿真软件FEKO仿真计算结果表明该模式激励器在94~96 GHz频率范围内目标模式的纯度超过95%,系统效率达到34%。
Based on the theory of millimeter-wave quasi-optical transmission and transformation, the principle of quasi-optical mode exciters exciting circularly polarized high-order target mode by ripple horn antennas, quasi-parabolic cylindrical reflectors and coaxial open-cavity resonators is studied in detail. The process of generating quasi-Gaussian mode HE11 by W-band corrugated horn antenna was analyzed. The design method of quasi-parabolic reflector antenna as the cavity radiation source was studied by using geometric ray method. The three sections The mechanism of high-order mode excitation of coaxial resonant cavity. At the same time, the paper also optimizes the quasi-light mode exciter whose working mode is TE62 mode and work center frequency is 94.8 GHz. The simulation results of FEKO using three-dimensional electromagnetic simulation software show that the mode exciter targets at 94-96 GHz The purity of the model is over 95% and the system efficiency is up to 34%.