Compact, Wideband Antennas Enabled by Interdigitated Capacitor-Loaded Metasurfaces
Compact, Wideband Antennas Enabled by Interdigitated Capacitor-Loaded Metasurfaces
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DOI：
10.1109/tap.2016.2535499
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发表时间：
2016-02
影响因子：
5.7
通讯作者：
Taiwei Yue;Z. Jiang;D. Werner
中科院分区：
文献类型：
--
作者：
Taiwei Yue;Z. Jiang;D. Werner
本文提出了一类基于超颖表面（MS）的集成平面天线，该天线由工作在基模以下的单极子馈电。研究了用于金属片背衬MS的各种叉指电容（IC）加载方案，这些方案提供了基底面小型化和带宽增强。基于线性极化（LP）MS的天线，由IC加载，提供15%的阻抗带宽和高于6.67 dBi的增益。通过色散分析揭示了天线的辐射机制和谐振频率依赖性，从而解释了天线的工作原理。接下来，引入了具有双负载IC的小型化天线，实现了10%的阻抗带宽，6 dBi以上的增益和30%以上的占地面积减少。通过引入三角形集成电路和对角槽加载，提出了一种更先进的紧凑型圆极化MS天线，该天线具有紧凑的基底面和改善的3 dB轴比（AR）带宽。结果表明，该天线的阻抗带宽为16%，增益大于5.5 dBi，AR <3 dB带宽为10%。三个天线原型的制造和测量，与实验结果和模拟预测之间的良好的对应关系，确认所提出的设计方法。这些结构紧凑、性能优良的MS基天线在现代宽带无线系统中具有广阔的应用前景。
In this paper, a class of integrated metasurface (MS)-based planar antennas are proposed, which are fed by monopoles operating below their fundamental modes. Various interdigitated capacitor (IC) loading schemes for a metallic sheet backed MS are investigated, which provide footprint miniaturization and bandwidth enhancement. A linearly polarized (LP) MS-based antenna, loaded by ICs, provides a 15% impedance bandwidth and a gain higher than 6.67 dBi. The radiation mechanism and resonant frequency dependence were revealed via a dispersion analysis, which serves to explain the working principle of the proposed antenna. Next, a miniaturized antenna with doubly loaded ICs was introduced, achieving an impedance bandwidth of 10%, a gain above 6 dBi, and a more than 30% footprint reduction. A more advanced compact, circularly polarized (CP) MS-based antenna with a compact footprint, and improved 3-dB axial ratio (AR) bandwidth were also presented, by introducing triangular IC and diagonal slot loadings to the MS. It is demonstrated that this antenna achieves an impedance bandwidth of 16%, a gain above 5.5 dBi, and an AR <;3 dB bandwidth of 10%. Three antenna prototypes were fabricated and measured, with good correspondence between the experimental results and simulation predictions, confirming the proposed design methodologies. These compact and well-performing MS-based antennas have promising potential for applications in modern wideband wireless systems.