A new multi-input multi-output (MIMO) antenna configuration with wideband and low sidelobe level (SLL) is introduced for ground-based synthetic aperture radar (GB-SAR). The proposed MIMO antenna has 15 transmitting and 16 receiving antenna arrays, arranged in two parallel straight lines, to synthesize a virtual array of 256 elements suitable for monitoring relatively large areas. The inter-element spaces are optimized to λ between transmitting elements and 4λ between receiving elements, to realize both low mutual coupling and an inferior SLL of lower than -37 dB for the overall MIMO antenna. The MIMO antenna element has eight rectangular patch linear arrays working at 17.1 GHz. A traveling wave-feeding network with center excitation is used to feed each element, in order to reduce the SLL and achieve a wide bandwidth of more than 300 MHz. The antenna array shows a gain of 14.3 dBi and half-power beamwidths (HPBWs) of 10° and 105° in the elevation and azimuth planes, respectively. The performance of the proposed design satisfies the GB-SAR requirements, which are validated by fabrication and measurement.

中文翻译：

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使用无人机分析和减轻工业现场的灾害风险


为地基合成孔径雷达 (GB-SAR) 引入了一种具有宽带和低旁瓣电平 (SLL) 的新型多输入多输出 (MIMO) 天线配置。所提出的MIMO天线具有15个发射天线阵列和16个接收天线阵列，排列成两条平行直线，以合成适合监测相对较大区域的256个单元的虚拟阵列。发射单元之间的单元间距优化为 λ，接收单元之间的单元间距优化为 4λ，以实现整个 MIMO 天线的低互耦和低于 -37 dB 的较差 SLL。 MIMO 天线元件有八个矩形贴片线性阵列，工作频率为 17.1 GHz。采用中心激励的行波馈电网络对每个元件进行馈电，以降低 SLL 并实现超过 300 MHz 的宽带宽。该天线阵列在仰角平面和方位平面上的增益分别为 14.3 dBi 和半功率波束宽度 (HPBW) 为 10° 和 105°。所提出设计的性能满足 GB-SAR 要求，并通过制造和测量进行了验证。