论文部分内容阅读
提出了一种紧凑型的二端口双陷波超宽带MIMO天线。该天线由两个圆形单极子和一个缺陷地结构组成,在两个单极子辐射片上刻蚀开口圆环槽,并在两个50Ω馈电微带线旁分别增加终端短路的低-高-低阶跃阻抗谐振器,实现了双陷波的功能,分别抑制了无线局域网WLAN(5.15～5.85 GHz)和802.16无线城域网WiMAX(3.4～3.8 GHz)信号对该天线系统的干扰;并在介质板地层和顶层增加隔离枝节,提高了隔离度。实验结果表明:该天线在-10dB的工作带宽为3.0～13.8 GHz,第一个陷波带宽为3.37～3.85 GHz,第二个陷波带宽为5.02～6.14 GHz,有效抑制了WiMAX和WLAN信号干扰;工作频带内,最小隔离度为13.5 dB,最大增益为4.94 dB,最大辐射效率为96.6%,包络相关系数小于0.07。测试表明该天线适用于多输入-多输出超宽带(MIMO-UWB)系统,且该天线结构紧凑,尺寸仅为47.5 mm×47.5 mm×0.8 mm,易用于便携式设备。
A compact two-port dual-notch UWB MIMO antenna is proposed. The antenna consists of two circular monopoles and one defective structure, etching the open circular groove on two monopole radiators and increasing the short-circuit of the terminal short-circuit at the two 50-ohm feeding microstrip lines respectively, High-low-impedance resonators realize double-notch function and suppress the interference of wireless local area network WLAN (5.15 ~ 5.85 GHz) and 802.16 wireless metropolitan area network WiMAX (3.4 ~ 3.8 GHz) signals to the antenna system respectively. And in the media layer and the top layer to increase the isolation section, improve the isolation. The experimental results show that the working bandwidth of the antenna at -10dB is 3.0 ~ 13.8GHz, the first notch bandwidth is 3.37 ~ 3.85GHz and the second notch bandwidth is 5.02 ~ 6.14GHz, which effectively suppresses the interference of WiMAX and WLAN signals In the operating band, the minimum isolation is 13.5 dB, the maximum gain is 4.94 dB, the maximum radiation efficiency is 96.6% and the envelope correlation coefficient is less than 0.07. The tests show that the antenna is suitable for MIMO-UWB systems and the compact size of the antenna is only 47.5 mm × 47.5 mm × 0.8 mm and is easy to use in portable devices.