基于Q值法的T型自动阻抗匹配网络的研究

Research on an Automatic Impedance Matching T-Network Based on Q-Based Design Method

自动阻抗匹配技术可以提高系统的传输效率和稳定性。目前自动阻抗匹配技术常使用智能算法进行求解,但传统智能算法建模复杂、迭代时间长、计算量大。针对这一问题,该文提出一种基于Q值法的自动阻抗匹配方法,并设计了相应的T型阻抗匹配网络。该研究方法从T型网络器件的解空间入手,利用解空间的截面求出Q_(0),进一步运用Q值法完成匹配网络参数的分析计算。基于建立的Matlab分析模型,仿真验证得出了该方法的匹配性能与负载电阻的大小有关的结论。制作了自动阻抗匹配网络系统样机进行验证,仿真与实测的结果表明该方法阻抗匹配效果较好,与遗传算法相比运算量较小,匹配速度得到很大提升,具有一定的实际应用价值。

Automatic impedance matching technology can improve the transmission efficiency and stability of the system. At present, the automatic impedance matching technology often uses intelligent algorithm to solve the problem, but the traditional intelligent algorithm is complex in modeling, usually spend a lot of time on iteration and calculation. To solve this problem, an automatic impedance matching method based on Q-based design method is proposed in this paper, and the corresponding T-network is designed. In this method, Q0 can be obtained from the plane, which crosses the solution space of the Tnetwork’s device, and then the calculation of matching network parameters can be completed by using the Q-based design method. Based on the established Matlab analysis model, the simulation results show that the matching performance of this method is related to the value of the load resistance. A prototype of the automatic impedance matching network system is made for verification. The simulation and experimental results show that the impedance matching effect of this method is better, the calculation is smaller, the matching speed is greatly improved compared with the genetic algorithm, and has a certain practical application value.