A planar, compact UWB MIMO antenna with four elements that accomplish band rejection from 4.91 to 6.41 GHz is presented. Rejection is accomplished using an L‐C stub connected to the ground plane. The length of the stub is changed to reject the band starting from 2.5 GHz to above 8.8 GHz. The perpendicular placement of the elements enables polarization diversity and attains high isolation. Elements 3 and 4 are 180° mirrored transforms of elements 1 and 2 on the opposite corners of the substrate. The antenna measures 50 × 50 mm² only with all four elements placed. The simulated results are validated by measurements of a fabricated prototype. The design attains the targeted specifications over the entire bandwidth of 2 to 12 GHz with a reflection coefficient better than −10 dB (except the rejected band), isolation more than 17 dB, low envelope correlation, low gain variation and strong rejection of the signals in the WLAN band. The small size and reduced complexity to obtain WLAN rejection makes the proposed design very useful for diversity applications and portable handheld devices with MIMO antennas as designed by panorama antenna.

中文翻译：

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具有WLAN频带抑制功能的四元件平面紧凑型UWB MIMO天线

提出了一种平面，紧凑的UWB MIMO天线，该天线具有四个元件，可实现4.91至6.41 GHz的频带抑制。使用连接到接地层的L–C存根可以完成拒绝。更改短截线的长度以拒绝从2.5 GHz到8.8 GHz以上的频带。元件的垂直放置可实现极化分集并实现高度隔离。元素3和4是在基板相对角上的元素1和2的180°镜像变换。天线尺寸50×50 mm ²仅放置所有四个元素。通过对预制原型的测量来验证仿真结果。该设计在2至12 GHz的整个带宽上均达到了目标规格，反射系数优于-10 dB（拒绝频带除外），隔离度超过17 dB，低包络相关性，低增益变化和信号的强抑制能力在WLAN频段中。较小的尺寸和降低的复杂度以获得WLAN拒绝性能，使得该建议设计对于多样性应用和全景天线设计的具有MIMO天线的便携式手持设备非常有用。