Broadband compact CPW‐fed metasurface antenna for SAR‐based portable imaging system
Broadband compact CPW‐fed metasurface antenna for SAR‐based portable imaging system
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DOI：
10.1002/mmce.21175
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
M. Cai;Xiaoqiang Li;Leming Fan;Guangli Yang;S. Sharma
中科院分区：
文献类型：
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作者：
M. Cai;Xiaoqiang Li;Leming Fan;Guangli Yang;S. Sharma
提出了一种用于C波段合成孔径雷达(SAR)成像的宽带紧凑共面波导(CPW)耦合馈电介面(MS)天线，该天线由16个均匀的周期正方形贴片组成辐射体。共面波导馈电结构具有以下两个功能：(1)激励MS贴片阵列中心下方的口径耦合缝隙结构。(2)它充当变形曲面面片单元的地平面。对不同的时隙进行了研究，最终采用了沙漏形状的时隙来提高成像应用的带宽。制作了中心频率为5.5 GHz(F0)、尺寸为60×60×1.524 mm~3(1.1λ0×1.1λ0×0.03λ0)的样机，并进行了测试，验证了设计原理。该天线在5.14~5.82 GHz范围内的阻抗带宽为12.4%，在宽边辐射下的峰值增益为9.2 dBI，平均增益为7.2 dBI。利用该天线进行了微波成像实验，取得了良好的性能。
A broadband and compact coplanar waveguide (CPW) coupled‐fed metasurface (MS)‐based antenna for C‐band synthetic aperture radar (SAR) imaging application is proposed in this article, which is consisted of 16 uniform periodic square patches performed as radiators. The CPW feeding structure gives two following functions: (1) It excites an aperture coupling slot structure underneath the center of MS patch array. (2) It acts as a ground plane for the metasurface patch units. Different slots were investigated and eventually an hourglass‐shaped slot is applied to enhance bandwidth for imaging applications. A prototype with a dimension of 60 × 60 × 1.524 mm3 (1.1λ0 × 1.1λ0 × 0.03λ0) operating at the center frequency 5.5 GHz (f0) has been fabricated and measured to verify the design principle. This antenna has a measured impedance bandwidth of 12.4% from 5.14 to 5.82 GHz, a peak gain of 9.2 dBi and averaged gain of 7.2 dBi at broadside radiation. Microwave imaging experiments using the proposed antenna have been carried out and a good performance is achieved.