微带八木贴片天线的特性研究

Research on Characteristics of Microstrip Yagi Array Antenna

研究了微带八木贴片天线的频率响应特性和辐射特性。利用电磁仿真软件HFSS分析了天线各贴片大小和贴片间距等参数变化对寄生贴片耦合场强度和相位的影响,得出了耦合场强度和相位随天线参数的变化规律,揭示了天线频率响应和辐射方向图随天线参数变化的本质原因;在此基础上给出了天线的设计步骤。在某项目中应用该设计步骤进行实例设计,针对项目对天线增益的要求优化天线增益方向图,使之满足项目要求;天线实物的测试结果与仿真结果吻合并完全满足设计要求,证明了设计方法的有效性。

The frequency response and radiation characteristics of a microstrip Yagi Array antenna were studied. The phase and amplitude of the coupled field on parasitic patches were observed with the EM software HFSS and their variation characteristics with respect to the patch sizes and gaps between the patches were investigated. The study revealed the nature of the variation of the frequency response and radiation pattern with the antenna parameters. Based on the study, a design methodology of the microstrip Yagi array antenna was given. An antenna was designed and optimized using the proposed design methodology to satisfy the desired gain and radiation pattern. The test results of the fabricated antenna are consistent with the simulation, which prove the validity of the proposed design methodology.