面向高炉料面监测的宽带微带阵列天线设计

Design of the broadband microstrip array antenna for blast furnace surface monitoring

针对高炉雷达高分辨率成像和高集成度的设计需求,设计了一种宽带微带阵列天线。通过寄生贴片和空气层的设计展宽天线带宽,将多输入多输出雷达与合成孔径雷达成像原理相结合,设计了线性多输入多输出阵列。通过波数域成像算法,对模拟料线进行了近场仿真成像实验。实验结果表明,天线主瓣方向增益可达14.05 dBi,反射系数小于-10 dB,绝对带宽为5.25 GHz,工作频率为20.67~25.92 GHz。距离向分辨率较现有高炉雷达提高至3 cm,模拟料线成像的方位向平均误差为0.008 m,距离向平均误差约为0.0011 m。与传统微带阵列天线相比,此天线有效地拓宽了带宽,距离向分辨率比传统高炉雷达高,可以准确地获得模拟料线形状信息,对高炉料面监测有工程应用价值。

Aiming at the requirements of high-resolution imaging and high integration of the blast furnace radar,this paper presents a method for designing a wideband microstrip array antenna,which broadens the antenna bandwidth through the design of parasitic patches and air layers.By combining multi-input multi-output(MIMO)radar and synthetic aperture radar(SAR)imaging principles,a linear MIMO array is designed,and a near-field simulation imaging experiment is performed on the simulated feed line through the wave number domain imaging algorithm.Simulation results show that the gain of the main lobe of the antenna can reach 14.05 dBi,the reflection coefficient is less than-10 dB,the absolute bandwidth is 5.25 GHz,the operating frequency is 20.67~25.92 GHz,and the range resolution is increased to 3 cm compared with the existing blast furnace radar.The average error of the azimuth direction of the simulated material line imaging is 0.008 m,and the range direction is 0.0011 m.Compared with the traditional microstrip array antenna,this antenna effectively widens the bandwidth,and the range resolution is higher than that of the traditional blast furnace radar.It can accurately obtain the shape information on the simulated material line,and has an engineering application value for blast furnace surface monitoring.