CPW 馈电的高隔离度一阻带 UWB-MIMO 天线设计

针对目前超宽带多输入多输出( ultra wideband multiple-input multiple,UWB-MIMO)天线仍存在的尺寸大、端口隔离不 够高、抗干扰能力弱等缺陷,设计了一款使用共面波导馈电( coplanar waveguide feed,CPW) 馈电的小型化具有陷波特性的 UWB-MIMO 缝隙天线,通过将方形辐射贴片切角来拓宽带宽,两天线单元地板互联,并在天线单元间增加栅栏形解耦枝节来 提高天线的隔离度。 天线尺寸仅为 30 mm × 56 mm × 0. 8 mm。 此外,在方形辐射贴片上刻蚀了开口谐振环( split ring resonator,SSR)结构的 C 形槽,可滤除 WLAN 频段信号( 5. 15 ~ 5. 85 GHz)对 UWB 系统的干扰。 天线的实测结果表明,该天 线工作频段为 2. 73 ~ 10. 71 GHz,端口隔离度小于- 20 dB,包络相关系数 ECC< 0. 01。 实验结果表明该天线适用于 UWBMIMO 通信系统。

Design of high isolation single band-notch UWB-MIMO antenna with coplanar waveguide feed

In order to improve the defect of UWB-MIMO antenna, such as large size, insufficient port isolation and weak antiinterference ability, a miniaturized UWB-MIMO slot antenna with notch characteristics fed by coplanar waveguide (CPW) is proposed, which cutting the square radiation patch to broaden the bandwidth, by connecting the two antenna unit coplanar ground and adding fence shaped decoupling branches between the antenna units, the isolation of the antenna is improved. The antenna size is only 30 mm× 56 mm×0. 8 mm. In addition, a C-slot open resonator ring ( SSR) structure is etched on the square radiation patch to filter the interference of WLAN band signals (5. 15~ 5. 85 GHz) to the UWB system. The measured results of the antenna show that the working frequency band of the antenna is 2. 73~ 10. 71 GHz, the port isolation is less than-20 dB, and the envelope correlation coefficient ECC is less than 0. 01. It shows that the antenna is suitable for UWB-MIMO communication system.