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