[理论总结]【多模宽带低剖面天线】从特征模看电磁超构表面：模式分析、调控、综合与激励

题目：Truncated Impedance Sheet Model for Low-Profile Broadband Nonresonant-Cell Metasurface Antennas Using Characteristic Mode Analysis "|`9{/]  
作者: Feng Han Lin, Zhi Ning Chen tL{~O=  
单位: National University of Singapore .N&}<T[  
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收录/引用：F. H. Lin and Z. N. Chen, “Truncated Impedance-Sheet Model for Low-Profile Broadband Non-resonant-cell Metasurface Antennas using Characteristic Mode Analysis,” IEEE Trans. Antennas Propag., vol. 66, no. 10, pp. 5043–5051, Oct. 2018. ecpUp39\  
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全文链接：https://ieeexplore.ieee.org/document/8408836 ;bX ~4O&v+  
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Abstract— A unit-cell-free truncated impedance sheet model isproposed for the modeling and design of low-profile broadbandmetasurface antennas (MAs) composed of nonresonant unit cellsusing characteristic mode analysis. Different from conventionalMAs with locally resonant unit cells, the nonresonant unit cellsof the proposed MAs only contribute to the grid impedance andthe MA operates with the global resonances of the metasurfaces.New measures are also reported to incorporate a higher ordermetasurface mode for wideband radiation. A low-profile broadbandMA is designed at the 5 GHz Wi-Fi bands for the proofof concept. Three modes are excited simultaneously, includinga quasi-TM01 mode, a quasi-TM21 mode, and a dipole mode.With a size of 0.8λL × 0.8λL × 0.087λL (λL is the wavelength infree space at the lowest operating frequency), the prototyped MAachieves a bandwidth of 45% with |S11| < −10 dB, boresightgain of 8.5–11.6 dBi, and 3 dB beamwidth of 40°–60°/43°–65° forthe E-/H-planes.Index Terms— Broadband antennas, characteristic modeanalysis (CMA), higher order modes, impedance loading,impedance sheet, metamaterials, metasurfaces (MTSs), modecontrol, multimode antenna, surface impedance. J5_Y\@  
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中文简介：核心思想是以小博大，局部改变全局，不变的是宏观结构，变的是本构关系，以“非谐振”单元构建和控制全局“谐振”，从而实现基函数的构造和精细调控。文章包含了“建模、分析、综合、调控、激励”五个方面，可玩度高，变化空间充足。 I?Fa
  
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1. Metasurface也讲模式---【基于特征模分析的超表面天线】 Ag0_^  
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2. Metasurface Antennas】超表面助力宽带、多频段、多天线系统去耦合，改善方向图畸变、提高隔离度 [/ .. +|)1_NK  
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描述:Fabricated sample of the antenna

图片:Fig18.jpg

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图1. 超构表面天线样品                                                 Gk799SDL  
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描述:S11 and Gain

图片:S11.png

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  图2. 实测与仿真反射系数与边射增益对比 r]BB$^@@V  
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描述:Radiation pattern

图片:pattern.png

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图3. 实测与仿真方向图 wc~a}0uz  
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描述:current distribution at modal resonant frequencies

图片:currents.png

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图4. 时域仿真得到的三个模式在各自谐振频率上的表面电流分布 `x6 i5mp  
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全文链接：https://ieeexplore.ieee.org/document/8408836 )dC%g=dtc  
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不愧是仿真八级大师，科研效率奇高

描述:CST进行模式分析的注意事项

图片:CST特征模分析注意事项.jpg

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