This paper presents a 4-port compact UWB MIMO antenna. It has 45${}^0$ tilted offset feed for better impedance matching and connected to cornered cut-out quad-radiators. Radially symmetric resonators are provided for impedance matching and isolation improvements. A miniaturized magnetic LC (MMLC) Minkowiski fractal loop acts as a magnetic shield between electric walls of feed and resonator for Wi-max band rejection. The contra-rotational symmetry of resonator and rotationally asymmetric strips in ground enhances isolation. To validate, a prototype antenna is fabricated and measured which shows good agreements. The proposed antenna has a compact dimension 31 mm × 31 mm, operates from 2.27 to 11.7 GHz and reject bands at 3.0–4.2 GHz. The average gain is > 4 dBi with ECC < 0.16 in the operating band. An equivalent circuit topology is also modelled which validates the design. The multi-port antenna system can be used for microwave imaging, RF-sensing and radar applications.

本文提出了一种4端口紧凑型UWB MIMO天线。它有 45${}^0$倾斜偏置馈电以获得更好的阻抗匹配并连接到角形切割四重辐射器。提供径向对称谐振器用于阻抗匹配和隔离改进。微型磁性 LC (MMLC) Minkowiski 分形环充当馈电壁和谐振器之间的磁屏蔽，用于 Wi-max 频带抑制。谐振器的反向旋转对称性和地面中的旋转不对称条带增强了隔离度。为了验证，制造和测量了一个原型天线，显示出良好的一致性。所提议的天线具有 31 mm × 31 mm 的紧凑尺寸，在 2.27 至 11.7 GHz 范围内工作，并在 3.0-4.2 GHz 范围内抑制频带。在工作频带中ECC <0.16时，平均增益> 4 dBi。等效电路拓扑也被建模以验证设计。