從特征模看電磁超構(gòu)表面：模式分析、調(diào)控、綜合與激勵

來源：更新時間：2024-08-11 閱讀：

題目：Truncated Impedance Sheet Model for Low-Profile Broadband Nonresonant-Cell Metasurface Antennas Using Characteristic Mode Analysis
作者: Feng Han Lin, Zhi Ning Chen
單位: National University of Singapore
收錄/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.
全文鏈接：https://ieeexplore.ieee.org/document/8408836
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.
中文簡介：核心思想是以小博大，局部改變?nèi)郑蛔兊氖呛暧^結(jié)構(gòu)，變的是本構(gòu)關(guān)系，以“非諧振”單元構(gòu)建和控制全局“諧振”，從而實現(xiàn)基函數(shù)的構(gòu)造和精細調(diào)控。文章包含了“建模、分析、綜合、調(diào)控、激勵”五個方面，可玩度高，變化空間充足。
往期回顧：
1. Metasurface也講模式---【基于特征模分析的超表面天線】
2. Metasurface Antennas】超表面助力寬帶、多頻段、多天線系統(tǒng)去耦合，改善方向圖畸變、提高隔離度
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