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采用十字缝隙耦合、多层积叠贴片和双层馈电等技术,并选择双偏置微带线作为馈电,设计了一种小型化双极化宽频带微带缝隙天线。这些技术的采用拓宽了天线带宽,实现了良好的阻抗匹配。双层馈电技术减小了天线尺寸,并使天线的两个端口具有良好的隔离度。通过样品测量,驻波比小于1.5的端口相对带宽分别达40%和38.5%,工作频带内两端口隔离度(S21)大于25 dB,增益最大值达9.1 dB。该天线具有良好的性能并且工作于1 710~2 170 MHz频段,可制作成天线阵应用于移动通信中。
By using cross-slot coupling, multi-layer stacking and double-layer feeding techniques, and choosing dual-bias microstrip line as feed, a miniaturized dual-polarization broadband microstrip slot antenna was designed. The adoption of these technologies broadens the antenna bandwidth and achieves good impedance matching. The double-feed technology reduces the size of the antenna and provides good isolation between the two ports of the antenna. Through the measurement of the samples, the relative bandwidths of ports with VSWR less than 1.5 are respectively 40% and 38.5%. The isolation between two ports (S21) in the working band is more than 25 dB and the maximum gain is 9.1 dB. The antenna has good performance and operates in the band 1 710 ~ 2 170 MHz and can be made into an antenna array for application in mobile communications.