2.4 GHz宽带圆极化微带天线的研究与实现

针对当前已有圆极化微带天线有效带宽窄、尺寸大等缺陷的现状,设计了一种应用于2.4GHz无线传感网络的宽带圆极化微带天线.采用AnsoftHFSS建立了天线的模型,并对其主要结构参数进行了仿真分析,最终推导出了天线的最优结构参数.最优结构参数下的仿真结果显示,天线的-10dB阻抗带宽达到了63.5%,3dB轴比(axialratio,AR)带宽达到了17.5%.同时,采用矢量网络分析仪对天线实物进行了回波损耗测试,测试结果与仿真结果吻合.最后,将设计的天线加载到CY2420通信节点上进行通信性能的测试,测试结果表明:加载了该宽带圆极化微带天线的节点在150m处的平均丢包率为0.36%,且天线任意方向下的丢包率基本相同.从测试结果可以看出该天线具有良好的圆极化特性和实用特性.

Research and realization of 2.4 GHz wideband circularly polarized microstrip antennas

Aiming at the current status that the existing circularly polarized microstrip antenna has defects such as narrow effective bandwidth and large size, a wideband circularly polarized microstrip antenna for 2.4 GHz wireless sensor network is designed. The model of the antenna is established by Ansoft HFSS, and the main structural parameters of the antenna are simulated and analyzed. Finally, the optimal structural parameters of the antenna are derived. Under the optimal structural parameters, the simulation results show that the -10 dB impedance bandwidth of the antenna reaches 63.5%, the 3 dB axial ratio bandwidth reaches 17.5%. At the same time, a vector network analyzer is also used to test the return loss of the antenna, and the test results were consistent with the simulation results. Finally, the designed antenna is loaded onto the CY2420 communication node for communication performance test. The test results show that the average packet loss rate at 150 m of the node is 0.36%, and it is almost the same in any direction. The test results show that the antenna has good circular polarization characteristics and is practical.