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Performance enhancement for antipodal Vivaldi antenna modulated by a high-permittivity metasurface lens

查看全文 作　　者：Shaopeng [1]PAN;Mingtuan [2]LIN;Lin [1]QI;Pan [1]CHEN;Yang [1]FENG;Gaosheng [1]LI 高影响力作者 机构地区：[1]College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;[2]College of Electronic Science,National University of Defense Technology,Changsha 410073,China高影响力机构 出　　处：《Frontiers of Information Technology & Electronic Engineering》索引2021年第22卷第12期,共11页高影响力期刊 基　　金：Project supported by the Open Fund for the Key Laboratory of Complex Systems Control and Intelligent Collaborative Technology,China(No.CSCIC191001)。 摘　　要：A metasurface unit is designed operating at 2–20 GHz to enhance the gain and radiation performance of an antipodal Vivaldi antenna(AVA).The unit has a simple structure,stable ultra-wideband performance,high permittivity,and can independently modulate two polarization modes electromagnetic waves.We analyze the current distribution on the unit and extract equivalent characteristic parameters to verify the ability of independent modulation on two polarization modes electromagnetic waves.The designed metasurface unit is integrated into the aperture of the AVA and forms the metasurface lens(ML)for guiding the propagation of electromagnetic waves.Two types of ML are proposed and integrated into the AVA to design antennas Ant1 and Ant2.The modulation effect of the lens on the electromagnetic wave is analyzed from the perspective of electric field amplitude and phase,and the final design is obtained.From the optimized design results,the AVA and the proposed Ant2 are fabricated and measured,and the measurement results are in good agreement with the simulation ones.The impedance bandwidth measured by Ant2 basically covers the 2–18 GHz frequency band.Compared with the conventional AVA,the gain of the proposed Ant2 is increased by 0.6–3.7 d B,the sidelobe level is significantly reduced,and the directivity has also been clearly improved. 关 键 词：Antipodal Vivaldi antenna(AVA) ULTRA-WIDEBAND High-permittivity DUAL-POLARIZATION Metasurface lens(ML)
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