宽带折线栅圆极化器的分析与优化设计

介绍了折线栅圆极器的分析理论和优化设计方法,给出了折线栅等效导纳计算公式的几个待定常系数的确定方法以及在设计频带内的最优常系数值,重新推导了多层折线栅级联网络的传输矩阵的计算公式,修正了文献上公式的错误.基于折线栅圆极化器的分析理论采用遗传算法优化设计了25～35 GHz频带范围内的折线栅圆极化器,并给出了HFSS仿真结果,表明轴比仿真值小于1dB的带宽大于40％,并且插入损耗低,验证了采用的分析和设计方法的有效性.

Analysis and optimum design of wideband meander-line polarizer

The analysis theory and optimum design method of meander-line polarizer are introduced.A method to determine the coefficients in empirical formulas for perpendicular and parallel polarization admittances for a meander-line grating plate are presented. The optimal values of these coefficients are given for the design frequency band. The T-matrix of transmission-line network model for N-layer meander-line polarizer is deduced, and the mistakes in reference papers are pointed out and corrected. Based on the analysis theory of meander-line polarizer GA(Genetic Algorithm) is used to optimize a meander-line polarizer over 25 GHz to 35 GHz. the structures are analyzed in HFSS as infinite periodic layered surfaces and the results are presented. The simulated AR(Axial Ratio) is less than 1dB over a bandwidth more than 40% and the inserted loss is low, which proves the validity of the proposed analysis and design method.