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利用传输法把滤波器型输出回路等效为双端口微波网络问题,通过理论分析,数值模拟和冷测实验证明了S21平方后的曲线能定性反映滤波器型输出回路的间隙阻抗频率特性。从而在仿真设计阶段,可将S21设为优化目标,利用三维电磁仿真软件的参数优化功能实现精确设计滤波器结构,比相位法,场分析法更加快捷准确。传输法同样适用于矢量网络分析仪冷测滤波器的实验,可消除系统拆装及波导元件引起的误差,使测量更加方便准确。
By using the transmission method, the filter output circuit is equivalent to the two-port microwave network problem. Theoretical analysis, numerical simulation and cold test show that the S21 square after the curve can qualitatively reflect the gap impedance frequency characteristics of the filter output circuit. Therefore, in the simulation design stage, S21 can be set as the optimization target, and the filter structure can be precisely designed by using the parameter optimization function of the three-dimensional electromagnetic simulation software, which is faster and more accurate than the phase method and the field analysis method. Transmission method is also suitable for vector network analyzer cold test filter experiments, eliminating system disassembly and waveguide components caused by the error, making the measurement more convenient and accurate.