具有高隔离度的紧凑型三陷波UWB-MIMO天线设计

Compact triple trap UWB-MIMO antenna design with high isolation

提出了一种具有高隔离度的紧凑型三陷波超宽带(ultra-wideband,UWB)多输入多输出(multiple-input multiple-output,MIMO)天线,整体尺寸为38 mm×26 mm×1.2 mm.通过对辐射贴片底部两侧进行多切角,实现了宽带化;通过在接地板上加载改进的波纹T型去耦结构,并刻蚀倒“π”型槽缝隙,实现了较高隔离度;通过在辐射贴片上刻蚀“U”型缝隙、在馈线上刻蚀类“H”型缝隙以及在右侧引入倒“C”型寄生枝节,实现了WiMAX(3.3~3.6 GHz)、WLAN(5.15~5.85 GHz)和X波段(7.25~7.75 GHz)3个频段的陷波.仿真与测试结果表明,该天线工作频段为2.9~11.3 GHz(相对带宽达到118.31%),隔离度小于-22.6 dB,包络相关系数小于0.01,辐射效率高,辐射特性良好,可以广泛应用于无线通信系统领域中.

A compact triple trap UWB-MIMO antenna with high isolation is proposed,with overall dimensions of 38 mm×26 mm×1.2 mm.A high degree of isolation is achieved by loading a modified corrugated T-shaped decoupling structure on the ground plate and etching an inverted“π”slot;a“U”slot is etched on the radiating patch,a class“H”slot is etched on the feed line,and an“H”slot is etched on the right-hand side.By etching a“U”slot on the radiating patch,etching a class“H”slit on the feed line,and introducing an inverted“C”parasitic branch on the right side,trapping in the WiMAX(3.3−3.6 GHz),WLAN(5.15−5.85 GHz)and X-band(7.25−7.75 GHz)bands are achieved.Simulation and test results show that the antenna works in the frequency band of 2.9 to 11.3 GHz(relative bandwidth reaches 118.31%),with isolation less than−22.6 dB,envelope correlation coefficient(ECC)less than 0.01,high radiation efficiency and good radiation characteristics,and the designed antenna can be widely used in the field of wireless communication systems.