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摘要: 涡旋电磁波,因携带有轨道角动量(OAM),从而体现出除了传统的强度、相位、频率、极化等自由度之外的一种新型自由度,理论上在任意频率下都具有无穷多种互不干扰的正交模态,并且近年来其在雷达成像、无线通信等研究领域展现出重要的应用潜力,所以引起国内外学者的广泛关注,具有很高的研究价值和应用前景。在这里,该文主要介绍近年来涡旋电磁波天线技术的研究进展,包括单一微带贴片天线、阵列天线、行波天线、以及超表面天线结构等。单一微带贴片天线由于其结构简单、制作成本低而被广泛运用;行波天线可以在宽带范围内产生多OAM模式的涡旋电磁波;阵列天线的设计原理简单,可以灵活地控制产生不同模态的高增益OAM电磁波;而超表面天线不需要复杂的馈电网络,从而具有天线整体剖面较低的优势。该文对这4种常见的涡旋电磁波天线进行了总结,并展望了未来的发展趋势。Abstract: The vortex electromagnetic wave, which carries the Orbital Angular Momentum (OAM), reflects a new degree of freedom in addition to the traditional degrees of freedom such as intensity, phase, frequency, and polarization. Theoretically, vortex electromagnetic wave, at any frequency, has an infinite number of orthogonal modes that do not interfere with each other, and in recent years, they have shown important potential applications in the fields of radar imaging, wireless communication and so on. Therefore, they have attracted considerable attention from scholars worldwide owing to their high research value and application prospects. Here, this paper mainly introduces the recent research advances on the antenna technology of vortex electromagnetic wave, including single microstrip patch antenna, array antenna, traveling wave antenna, and metasurface antenna structure. The single microstrip patch antenna is widely used owing to its simple structure and low manufacturing cost. The traveling wave antenna can generate multi-OAM mode vortex electromagnetic waves in a wide-frequency range. The array antenna is easy to design and controllably generate high-gain OAM electromagnetic waves with different modes. The metasurface antennas do not require complex feeding networks, which has the advantage of a lower profile of the antenna. Finally, we summarize these four common vortex antennas and further look forward to their future developments.
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表 1 单一的微带贴片天线结构产生的涡旋电磁波的性能
Table 1. Performances of generating vortex electromagnetic waves a single microstrip patch antenna structure
天线类型 单位 时间 天线尺寸($ \lambda_0 $) 工作频率(GHz) OAM模式 增益(dB) 不规则F形结构[51] 北京邮电大学 2017 1.02×1.25×0.06 17.00 +1 / 规则的椭圆形结构[52] 意大利尼科洛库萨诺大学 2014 0.80×0.80×0.01 2.40 +1, +2 / 规则的正八边形结构[53] 西安电子科技大学 2019 1.24×1.24×0.02 2.47 +1, –1 4.8 规则的圆形结构[54] 厦门大学 2019 0.27×0.27×0.01
0.46×0.46×0.021.62
2.73+1
+2/ 双馈点环形嵌套结构[55] 成都电子科技大学 2017 $ \Phi $2.26×0.03 5.65 +1, –2 / 单馈点环形嵌套结构[56] 中国人民大学 2018 1.00×1.00×0.13 4.65~5.20 +2, +3 1.5, 1.8 单馈点圆锥共形结构[57] 合肥工业大学 2019 $\Phi $0.53×0.02 2.40 ±1, ±2 6.6 单馈点环形嵌套结构[58] 意大利尼科洛库萨诺大学 2017 $\Phi $1.00×0.01 2.00 +1 / 表 2 报道的行波天线结构产生OAM波的性能
Table 2. Reported performances of generating OAM wave from traveling wave antenna structure
天线类型 单位 时间 天线尺寸(λ0) 工作频率(GHz) OAM模式 增益(dB) 环形谐振腔天线[59-61] 浙江大学 2015 / 10.00 2, 3, 4 / 2017 Φ4.12 10.00 ±3 3.39 2017 Φ20.00×8.43 10.00 ±2 18.85 ±3 19.75 单臂阿基米德平面螺旋天线[62] 云南大学 2017 Φ0.76×0.01 1.30~3.25 1 / Φ1.57×0.02 3.45~6.10 2 Φ2.79×0.03 6.25~10.50 3 嵌套三维立体螺旋线[63] 空军工程大学 2019 >Φ0.90 4.80~5.20 2 7.60 3 加腔内外馈电阿基米德螺旋线[65] 合肥工业大学 2019 2.60×0.80 3.00 ±1 6.70~10.00 3.47×1.07 4.00 ±2 4.16×1.28 4.80 ±3 加腔三维立体螺旋线[66] 合肥工业大学 2019 Φ0.51×0.13 0.76 0 4.55 Φ1.03×0.26 1.55 1 Φ1.63×0.41 2.45 2 四臂等角平面螺旋天线[64] 电子科技大学 2019 Φ2.13×0.03 5.60~6.00 0 / –1 –2 –3 三环嵌套平面等角螺旋线[67] 电子科技大学 2019 Φ3.00×0.57 3.00 1 6.94 3 6.76 5 5.49 表 3 阵列天线结构产生的OAM波的性能
Table 3. Reported performances of OAM wave generated by array antenna structure
阵元结构 单位 时间 天线尺寸(λ0) 工作频率(GHz) OAM模式 增益(dB) 微带贴片 英国谢菲尔德大学[72] 2014 Φ2.00×0.05 10.00 ±1 2.45 法国雷恩第一大学[73] 2015 0.91×0.69×0.01 2.50 +1 / 意大利帕多瓦大学[74] 2015 Φ1.60×0.01 5.75 0, ±1 8.35 上海交通大学[83] 2016 1.67×1.67×0.10 4.80 ±1 9.00 清华大学[75] 2017 2.03×2.03×0.01 1.90 0, ±1, ±2, ±3 / 复旦大学[76] 2017 Φ4.84×0.03 5.72~5.95 ±1 / 中国科学院大学[86] 2017 Φ6.00 8.00~12.00 0, +1, +2, +3 / 西安电子科技大学[53,77,80,82,84] 2017 2.20×2.00×0.10 5.40~5.60 –1
+17.35
8.053.10×3.10×0.07 9.70~10.70 0
±1
±2
±314.15
9.55
9.25
8.952019 0.61×0.61×0.02 2.40 –1,–2 / Φ3.33×0.06 2.33~2.73 ±1, ±2, ±3 6.35 Φ1.90×0.06 5.80 0, –1, –2, –3 >6.55 湖南大学[78] 2018 1.28×1.28×0.07 2.50 +1
–13.15
3.05内蒙古科技大学[79] 2018 Φ5.60×0.05 5.50~6.10
5.65~6.10±1
±2
09.15
4.05
7.45电子科技大学[33] 2019 4.85×4.85×0.14 13.50~16.70 –1, –2 / 韩国牧园大学[85] 2019 7.50×7.50 18.00 +5 / 北京邮电大学[81] 2019 Φ1.00×0.02 1.55 ±1, +2 / 喇叭 上海交通大学[89] 2015 Φ4.00 2.20 0, ±1, ±2, ±3, ±4 8.75 国防科技大学[90] 2016 Φ10.00 9.90 0, +1, +2, +3, +4, +5, +6, +7 / 浙江大学[92] 2016 8.86×9.06×0.02 9.70 0, ±1 8.48 电子科技大学[91] 2018 Φ0.80×0.34 2.45 0, +1, +2, +3 / 偶极子 瑞典乌普萨拉大学[43,70] 2007 Φ4.00 1.00 +1, +2, +4 / 2010 Φ1.50 2.40 +1,+2 / 华南理工大学[71] 2017 1.76×1.76×0.01 2.10~2.70 ±1 / Vivaldi 北京理工大学[87] 2013 Φ1.57×1.20 6.00 0,±1,±2,±3,+4 7.00 电子科技大学[88] 2018 Φ0.51×0.40 2.70~2.90 0, ±2 / 谐振腔 华中科技大学[93] 2016 Φ1.00×0.16 3.50 +1, +2 / 表面等离子体激元 东南大学[94] 2018 Φ3.20×0.06 5.50
5.80
6.00
6.30
6.60–2
–1
0
+1
+2/ 单臂螺旋 西安电子科技大学[95] 2018 Φ5.33×0.47 3.40~4.70 +1, +2, +3 8.50 表 4 产生OAM波的超表面天线及性能
Table 4. The metasurface antennas and their properties for generating OAM waves
天线类型 单位 时间 天线尺寸(λ0) 工作频率(GHz) OAM模式 增益(dB) 反射型超表面 西安电子科技大学[98-104] 2016 10.00×10.00×0.12 5.80 1; 2; 4 / 2016 10.00×10.00×0.12 5.80 x极化1, y极化2 / 2016 10.00×10.00×0.07 5.50~6.50 1, 1; 1, 2 / 2017 10.00×10.00×0.07 5.80 1, 2 / 2018 12.60×12.60×0.22 10.00 1 / 2018 8.82×8.82×0.16
14.70×14.70×0.266.00
10.001, –1(±30°)
1, –1(±30°)17.7
19.82018 10.50×10.50×0.13 9.00~11.00 1 19.9 衡阳师范学院[107] 2017 6.72×6.72×0.13 6.95~18.00 1; 2 / 浙江大学[108] 2017 Φ7.00×0.10 10.00 0; 1; 2 10 东南大学[105] 2018 12.50×12.50×3.00 40.25 –1 / 安徽大学[106] 2019 2.38×2.38×0.07 5.00~6.30 –1, 0, 1 11.05 南京航空航天大学[109] 2019 Φ6.46×0.15 18.00~42.00 1, 3 / 北京邮电大学[110] 2019 Φ15.00×0.10 5.00~7.50 4 17.93 华南理工大学[111] 2019 3.87×3.87×0.11 5.80 1; 2; 3; 4 15.4 中国科学院[112] 2019 8.50×8.50×0.10
4.20×4.20×0.055.20
10.50~12.001
2/ 合肥工业大学[113] 2019 3.50×3.50×0.10 300.00 –1, –2, –3, 1, 2, 3 >20 透射型超表面 北京大学[114] 2015 5.00×5.00×0.08 11.80 2 / 香港大学[119,120] 2017 9.60×9.60×0.05 17.85 2; 4 / 2017 4.58×4.58×0.05 17.85 –1, –2, 0, 1, 2 / 浙江大学[121] 2018 6.90×7.30×2.60 10.00 –1, –2, –3, –4 1, 2, 3, 4 / 南京理工大学[126] 2018 9.40×9.40×0.76 32.90~36.80 x极化–1, y极化2 15 西安电子科技大学[115-118] 2017 18.60×18.60×0.68 10.00 2 / 2018 4.67×4.67×0.15 10.00 1 14.5 2018 9.20×9.20×0.23 13.00~15.00 x极化0, y极化1 26, 20 2019 4.80×4.80×0.20 9.60~10.32 1; 2; 3 / 上海交通大学[122] 2019 6.00×6.00×0.05 10.00 1; 2 / 哈尔滨工业大学[123] 2019 8.00×8.00×0.15 10.00~11.30 1 / 空军工程大学[124] 2019 4.88×4.88×0.14 14.00 1 / 中国科学院[125] 2019 5.25×5.25×0.10 10.00 2 10.85 全息超表面 香港大学[127] 2016 3.50×3.50×0.10 6.20 2; 4 / 西安电子科技大学[128,129] 2019 20.20×20.20×0.11 20.00 –1, 1(±30°) / 2019 20.20×20.20×0.11 20.00 1; 2; 3 / 数字编码型超表面 西安电子科技大学[130,131] 2018 6.30×6.30×0.04 4.75 1, 2 / 2018 6.67×6.67×0.04 5.00 1(0°, 30°)
2(0°, 20°)/ 空军工程大学[132-134] 2018 9.00×9.00×0.06 6.00 1 / 2018 8.84×8.84×0.08 8.50 x-极化–2, 2
y-极化–1, 1/ 2019 5.85×5.85×0.07 7.10~7.50
7.00~7.50–1
114.7
11.1东南大学[135-137] 2017 12.00×12.00×0.10 14.50~15.50 1(±30°) / 2017 Φ15.00×0.15 15.00 x-极化1
y-极化–1/ 2019 4.80×4.80×0.05 10.00 1, –1 / -
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