This paper presents a novel approach to design compact wearable antennas based on metasurfaces. The behavior of compact metasurfaces is modeled with a composite right-left handed transmission line (CRLH TL). By controlling the dispersion curve, the resonant modes of the compact metasurface can be tuned efficiently. A printed coplanar waveguide (CPW) monopole antenna is used as the feed structure to excite the compact metasurface, which will result in a low profile antenna with low backward radiation. Following this approach, two compact antennas are designed for wearable applications. The first antenna is designed to operate at its first negative mode (−1 mode), which can realize miniaturization, but maintain the broadside radiation as for a normal microstrip antenna. The proposed prototype resonates around 2.65 GHz, with a matching bandwidth of 300 MHz. The total dimensions of the antenna are 39.4 × 33.4 mm ² (0.1 λ ₀ ² ), and its maximum gain is 2.99 dBi. The second antenna targets dual-band operation at 2.45 and 3.65 GHz. A pair of symmetric modes (±1 modes) are used to generate similar radiation patterns in these two bands. The size of the antenna is 55.79 × 52.25 mm ² (0.2 λ ₀ ² ), and the maximum gains are 4.25 and 7.35 dBi in the two bands, respectively. Furthermore, the performance of the antennas is analyzed on the human body. The results show that the proposed antennas are promising candidates for Wireless Body Area Networks (WBAN).

中文翻译：

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基于超表面的紧凑型可穿戴天线的新设计方法。

本文提出了一种新颖的方法来设计基于超表面的紧凑型可穿戴天线。使用复合的左右手传输线（CRLH TL）对紧凑的超表面的行为进行建模。通过控制色散曲线，可以有效地调整致密超表面的共振模式。印刷共面波导（CPW）单极天线用作馈电结构来激发紧凑的超颖表面，这将导致低剖面天线的后向辐射低。按照这种方法，为可穿戴应用设计了两个紧凑型天线。第一天线被设计为以其第一负模（-1模式）工作，该第一模可实现小型化，但与普通微带天线一样，可保持宽边辐射。拟议的原型在2.65 GHz附近产生共振，匹配带宽为300 MHz。天线的总尺寸为39.4×33.4 mm ²（0.1λ ₀ ² ），并且它的最大增益是2.99 dBi的。第二根天线的目标是在2.45 GHz和3.65 GHz的双频操作。一对对称模式（±1模式）用于在这两个频带中生成相似的辐射图。天线的尺寸是55.79×52.25毫米 ²（0.2λ ₀ ² ），和最大增益是4.25和7.35 dBi的在两个频带，分别。此外，在人体上分析天线的性能。结果表明，所建议的天线是无线人体局域网（WBAN）的有希望的候选者。