Hu Ruiyue, Zhang Feng, Ye Shengbo, Fang Guangyou
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.
Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China.
Micromachines (Basel). 2023 Jun 29;14(7):1329. doi: 10.3390/mi14071329.
An ultra-wideband and high-gain Vivaldi antenna with artificial electromagnetic material, suitable for ground-penetrating radar (GPR) systems, is proposed. Directors loaded inside the antenna gradient slot direct electromagnetic waves by inducing current to improve gain. The artificial electromagnetic material, also called metamaterial, is composed of multiple "H"-shaped units arranged in a certain regular pattern, loaded at the antenna aperture. The artificial electromagnetic units affect the antenna radiation waves by changing the refractive index to improve radiation directivity. The four Vivaldi units are arranged into a horn-shaped array, and each two units are orthogonally fed to realize dual polarization. Experimental results demonstrate that the antenna has good impedance matching of S11≤-10 dB in 0.9-4 GHz, and the maximum realized gain can reach 15.2 dBi.
提出了一种适用于探地雷达（GPR）系统的、带有人工电磁材料的超宽带高增益维瓦尔第天线。加载在天线渐变槽内的导向器通过感应电流来引导电磁波，以提高增益。人工电磁材料，也称为超材料，由多个按一定规则排列的“H”形单元组成，加载在天线孔径处。人工电磁单元通过改变折射率来影响天线辐射波，以提高辐射方向性。四个维瓦尔第单元排列成喇叭形阵列，每两个单元正交馈电以实现双极化。实验结果表明，该天线在0.9 - 4 GHz频段内具有良好的阻抗匹配，S11≤ - 10 dB，实现的最大增益可达15.2 dBi。
