A compact four-element ultra-wideband (UWB) multiple-input–multiple-output (MIMO) antenna with dual polarization and dual-notched capabilities was developed and fabricated. The MIMO antenna is composed of four orthogonally placed half-cutting UWB antenna elements. This orthogonal placement improves the isolation. Furthermore, an L-shaped slot and a continuous bending slot are etched to realize the band-rejection function in the WiMAX and WLAN bands. The result shows that the antenna achieved operating bands of 2.9–16.5 GHz (140.2%, S11 < −10 dB), fully covering the UWB (3.1–10.6 GHz). The port isolation is greater than 23 dB in the frequency band of interest, excluding two rejected bands. Moreover, the MIMO antenna has excellent diversity performance, such as a low envelope correlation coefficient (<0.004), high diversity gain (approximately 10 dB), and good omnidirectional radiation characteristics.

开发并制造了具有双极化和双缺口能力的紧凑型四元超宽带 (UWB) 多输入多输出 (MIMO) 天线。MIMO 天线由四个正交放置的半切割 UWB 天线元件组成。这种正交放置提高了隔离度。此外，刻蚀L形槽和连续弯曲槽，实现WiMAX和WLAN频段的带阻功能。结果表明，天线实现了 2.9-16.5 GHz 的工作频段（140.2%，S 11< -10 dB)，完全覆盖 UWB (3.1–10.6 GHz)。端口隔离在感兴趣的频带中大于 23 dB，不包括两个被拒绝的频带。此外，MIMO天线具有优异的分集性能，如低包络相关系数（<0.004）、高分集增益（约10 dB）和良好的全向辐射特性。