基于Dixon优化算法的双频匹配网络设计

为了解决高频地波雷达(high frequency surface wave radar, HFSWR)双频发射天线因小型化造成的阻抗不匹配问题,设计了一款适用于双频发射天线的匹配网络。基于所设计的匹配网络的拓扑结构,推导了反射系数关于网络元件参数的表达式,并以此构造目标函数,将网络中各元件参数作为优化变量,利用Dixon优化算法得到了网络中各元件的参数值。仿真与实测结果均表明,所设计的匹配网络能够同时实现双频的阻抗匹配,并能够满足带宽大于60 kHz的设计要求,而且该匹配网络元器件数目少,能够减少匹配网络带来的损耗。在双频匹配网络的基础上进行扩展,得到的三频匹配网络具有较好的匹配效果。并且得到的雷达回波谱质量良好,说明本文方法在实现多频发射天线同时匹配方面具有可行性和有效性,能够满足工程需求。

Design of dual frequency matching network based on Dixon optimization algorithm

In order to solve the impedance mismatch problem caused by miniaturization of dual frequency transmitting antenna of high frequency surface wave radar (HFSWR), a matching network suitable for dual frequency transmitting antenna is designed. Based on the topological structure of the designed matching network, this paper deduces the expression of the reflection coefficient related to the parameters of the network elements, and constructs the objective function. Taking the parameters of each element in the network as optimization variables, the parameters of each element in the network are obtained by Dixon optimization algorithm. The simulation and measurement results show that the matching network designed in this paper can realize the impedance matching of dual frequency simultaneously, and can meet the design requirements of bandwidth greater than 60 kHz. Moreover, the number of matching network components is small, which can reduce the loss caused by the matching network. Based on the dual frequency matching network, the designed triple frequency matching network can also achieve good matching effect.And the quality of the radar echo spectrum is good, which shows that this method is feasible and effective in realizing the simultaneous matching of multi frequency transmitting antennas, and can meet the engineering requirements.