Compact 4 element Sierpinski Knopp fractal UWB MIMO antenna with dual band notch
Compact 4 element Sierpinski Knopp fractal UWB MIMO antenna with dual band notch
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DOI：
10.1002/mop.31092
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发表时间：
2018-04
影响因子：
1.5
通讯作者：
S. Rajkumar;K. Selvan;P. H. Rao
中科院分区：
文献类型：
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作者：
S. Rajkumar;K. Selvan;P. H. Rao
提出了一种4单元超宽带(UWB)多输入多输出(MIMO)天线。该天线的总尺寸为40×40 mm~2。在天线辐射器的设计中采用了一种新颖的Sierpinski-Knopp分形几何来实现小型化。天线单元彼此垂直放置。任意一对元件之间的间距为0.11GHz，为7.15GHz处的自由空间波长)。在辐射元件上刻蚀了CSRR形状的槽，以实现WiMax 3.5 GHz和WLAN5.4 GHz区域的双频陷波特性。该天线的工作频率为2.6千兆赫至10.6千兆赫，反射系数S11<；−为10分贝，隔离度优于20分贝。MIMO天线不需要任何额外的结构来改善隔离度。通过计算包络相关系数(ECC)和容量损失(CL)来评估该天线的分集性能。实测值与模拟结果吻合较好。
In this communication, a 4 element ultra‐wide band (UWB) multiple‐input multiple‐output (MIMO) antenna is presented. The total size of the proposed antenna is 40 × 40 mm2. A novel Sierpinski Knopp fractal geometry is used in the antenna radiator design to accomplish miniaturization. The antenna elements are placed orthogonal to each other. The spacing between any pair of elements is 0.11 λ (λ being the free space wavelength at 7.15 GHz). A CSRR shape like slot is etched on the radiating element to achieve dual band notch characteristics at WiMax 3.5 GHz and WLAN 5.4 GHz regions. The proposed antenna operates from 2.6 to 10.6 GHz, exhibiting a reflection coefficient S11 < −10 dB and an isolation better than 20 dB. The MIMO antenna does not require any additional structure to improve isolation. Envelope correlation coefficient (ECC) and capacity loss (CL) are calculated to evaluate the diversity performance of the proposed antenna. The measured values exhibit better match with the simulated results.