传输线变压器分析方法的matlab仿真

传输线变压器是多模多馈天线系统中的重要部件，由它构成的阻抗变换器和功率合成与分配器件组成的多模馈电网络是实现多模多馈特性的关键。由于它具有频带宽。阻抗匹配好，截止频率高，功率容量大等特点，现在已经广泛用于通信的各个领域。对于传输线变压器性能的分析有多种不同的分析方法，但都有着各自的优缺点。该文分别应用考虑线圈互耦的等效电路模型和不对称传输线思想分析了传输线变压器的特性，并将频率变化对磁导率的影响应用到等效电路模型特性中，最后以输入阻抗为例结合实际测量用matlab对两者的分析结果进行了仿真比较，给出了比较性的结论。

Matlab Simulation of Transmission-line Transformer Analysis Method

Transmission- line transformer is an important component in multimode multi -feed antenna system, the impedance convertor and power combining/splitting apparatus which are constituted by transmission - line transformer are the crux of the characteristics of achieving multimode multi - feed. Because of its broad bandwidth, well impedance matching, high cut - off frequency,large power capacity, now it is widely used in all of the communication fields. There are many methods to analyze it, but they have advantages and disadvantages. By using the equivalent circuit model with mutual coupling between transmission - lines taken into account and the asymmetrical bifilar even transmission - line theory respectively, the influence on permeability of the variety of frequency was applied to the analysis of transmission - line transformer equivalent circuit model, the transmission - llne transformer is analyzed in this paper. Based on these two analyses and combining the measured input impedance, a matlab simulator is used to compare the analysis results, and the comparative resultd are also given.