可用于WLAN的双频MIMO天线设计

Dual-band MIMO antenna design for WLAN

设计了一款可用于WLAN的双频MIMO天线。天线的正面为L型单极子,背面为金属接地板。通过在接地板上加载耦合枝节使天线具有双频特性。同时,为了天线的小型化,对耦合枝节进行了弯折处理,减小天线尺寸。在两个天线单元之间加载T型寄生枝节和刻蚀矩形缝隙来提高天线的隔离度。使用电磁仿真软件和矢量网络分析仪对天线进行仿真和实测,结果表明:天线的工作频段为2.4~2.55 GHz和5.1~6.3 GHz,覆盖了WLAN的频段,同时在低频段内隔离度高于19 dB,高频段内隔离度高于25 dB。此外,天线的包络相关系数小于0.01且具有全向辐射特性。天线整体性能较好,可以满足WLAN的需求。

A dual-band MIMO antenna was designed for WLAN.The front of the antenna was an L-shaped monopole,and the back was a metal ground plate.The coupling stub was loaded on the ground plate to achieve dual-frequency characteristics.Meanwhile,the coupling stub was bent to miniaturize the antenna.A parasitic T-branch was loaded between two antenna elements,and a rectangular slit was etched to improve the isolation of the antenna.Electromagnetic simulation software and vector network analyzer were used to simulate and measure the antenna respectively.The results show that the working band of the antenna is 2.4-2.55 GHz and 5.1-6.3 GHz,which covers the band of WLAN.The isolation in the lower frequency band is greater than 19 dB,and it is better than 25 dB in the higher frequency band.In addition,the envelope correlation coefficient of the antenna is less than 0.01,and it has omnidirectional radiation characteristics.The overall performance of the antenna can well meet the requirements of WLAN.