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针对微带天线的阻抗频带窄的缺点,分析比较了扩展微带天线频带宽度的几种途径。通过采用双层结构的加寄生元的参差调谐技术,使微带天线元的阻抗频带宽度得到了显著地提高。并以此宽频带微带天线为阵元,设计了四元串馈阵和四元并馈阵两种形式的微带天线阵。实验结果表明,这两种馈电形式的微带天线阵均能满足高分辨率微波遥感成像雷达对天线阵阻抗带宽的要求。
In view of the narrow impedance band of the microstrip antenna, several ways to expand the bandwidth of the microstrip antenna are analyzed and compared. The impedance band width of the microstrip antenna element has been significantly improved by adopting the staggered tuning technique with parasitic element of double layer structure. With this broadband microstrip antenna as the array element, we design two types of microstrip antenna array, quaternary array feed-forward and quaternion feed-forward. The experimental results show that the two kinds of microstrip antenna arrays can meet the requirements of antenna array impedance bandwidth of high resolution microwave remote sensing imaging radar.