具有高隔离度的双陷波超宽带多入多出天线

王丽黎; 杜忠红; 杨海龙; 韩雪妮; 席晓莉

doi:10.11884/HPLPB202032.190443

具有高隔离度的双陷波超宽带多入多出天线

doi: 10.11884/HPLPB202032.190443

西安理工大学自动化与信息工程学院，西安 710048

基金项目: 国防预研基金项目（6140450010302）；西安市科技计划项目（2017080GG/RC043（XALG014）

详细信息

作者简介:
王丽黎（1968—），女，副教授，硕士生导师，从事天线与电波传播、先进导航技术研究；wanglili@xaut.edu.cn

中图分类号: TN822⁺.8
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出版历程
- 收稿日期: 2019-12-02
- 修回日期: 2020-03-16
- 刊出日期: 2020-05-12

Dual band-notch ultra-wideband multiple-input multiple-output antenna with high isolation

School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, China

摘要

摘要: 提出了一款具有高隔离度的双陷波超宽带多入多出（UWB MIMO）天线。该天线由两个相同的半切超宽带天线单元倒置构成。通过在天线底板刻蚀栅栏型缺陷地解耦结构，使该MIMO天线的隔离度提高至25 dB。此外，在天线半圆形辐射贴片上刻蚀两个方向相反的“L”型缝隙，实现了双陷波的功能，分别抑制了802.16无线城域网WiMAX（3.2～3.7 GHz）和WLAN（5.15～5.85 GHz）信号对天线系统的干扰。实验结果表明，该天线在3～11 GHz工作带宽内的隔离度大于25 dB，包络相关系数（ECC）小于0.004；第一个陷波频段为3.0～3.7 GHz，第二个陷波频段为5.1～5.85 GHz，有效抑制了WiMAX和WLAN的信号干扰。
- 超宽带 /
- MIMO天线 /
- 高隔离度 /
- 栅栏型解耦结构 /
- 双陷波天线
Abstract: This paper presents an ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna, which has high isolation and double band-notch in the UWB band. The MIMO antenna consists of two half-cutting UWB antenna units which have high isolation (S₂₁＞25 dB) because of the use of a novel fence-type decoupling structure on the bottom plate of the antenna. In addition, two “L”shaped slots are etched on the antenna radiation patch, and the characteristic of the double band-notch are realized. The interference of the 802.16 WiMAX (3.2−3.7 GHz) and the WLAN (5.15−5.85 GHz) signal to the antenna system is suppressed, respectively. The experimental results show that the antenna has high isolation and a low envelope correlation coefficient (ECC＜0.004) in the UWB band. The first notch band is 3.0−3.7 GHz and the second notch band is 5.1−5.8 GHz, which effectively suppresses the interference of WiMAX and WLAN signals.
- ultra-wideband /
- multiple-input multiple-output antenna /
- high isolation /
- fence-type decoupling structure /
- dual band-notch antenna

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图 1 UWB MIMO天线的几何形状

Figure 1. Geometry of the proposed UWB MIMO antenna

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图 2 原始天线和半切天线的几何结构以及S₁₁

Figure 2. Schematics and S₁₁ parameter of original antenna and half-cutting antenna

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图 3 有无解耦结构的隔离度对比

Figure 3. Comparison of isolation with or without decoupling structure

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图 4 不同缝隙数量对天线隔离度的影响

Figure 4. Influence of different numbers of slits on antenna isolation

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图 5 7.5 GHz时天线有无解耦结构的电流分布

Figure 5. Current distribution of antenna with or without decoupling structure at 7.5 GHz

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图 6 双陷波UWB MIMO天线的S₁₁

Figure 6. S₁₁ of the proposed two band-notched UWB MIMO antenna

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图 7 双陷波超宽带MIMO天线的的表面电流分布

Figure 7. Surface current distribution of double-notch UWB MIMO antenna

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图 8 天线仿真和测试的S参数

Figure 8. Measured and simulated S-parameters of the antenna

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图 9 超宽带MIMO天线的方向图

Figure 9. Radiation patterns of the proposed UWB MIMO antenna

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图 10 天线的增益和效率

Figure 10. Gain and efficiency of the proposed antenna

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图 11 MIMO天线的相关系数

Figure 11. ECC of the proposed MIMO antenna

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表 1 天线的几何尺寸

Table 1. Antenna geometry

L₁/mm	L₂/mm	L₃/mm	L₄/mm	L₅/mm	L₆/mm	W₁/mm	W₂/mm	W₃/mm	W₄/mm	R₁/mm	R₂/mm
6.5	5.0	5.1	0.1	12.5	17.25	6.0	3.3	1.5	0.2	9.5	15

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表 2 本文提出的超宽带MIMO天线与之前报道天线的性能比较

Table 2. Performance comparison between the proposed UWB-MIMO antenna and other recently reported antennas

paper	antenna size	bandwidth/GHz	notched-bands/GHz	isolation/dB	ECC
Ref. [7]	32.4 mm×58.4 mm	2.44～10.75	3.01～4.00, 5.20～5.86	＞22	＜0.015
Ref. [8]	73 mm×73 mm	3.00～18.00	3.30～3.80, 5.10～5.80	＞20	＜0.001 5
Ref. [10]	33 mm×35 mm	3.10～5.00	−	＞22	−
Ref. [12]	28 mm×50 mm	2.80～11.50	3.30～3.90	＞18	＜0.000 3
Ref. [15]	58 mm×58 mm	3.00～13.50	3.20～3.80, 5.20～5.80	＞22	＜0.008
Ref. [16]	48 mm×80 mm	3.10～10.60	−	＞25	−
this paper	35 mm×50 mm	3.00～11.00	3.10～3.70, 5.15～5.85	＞25	＜0.004

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