一种小型化宽频带天线单元的设计与研究

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25dB，增益最大值达9．1dB。该天线具有良好的性能并且工作于1710～2170MHz频段，可制作成天线阵应用于移动通信中。

Research and Design of a Novel Miniaturized Broadband Microstrip Antenna Unit

A miniaturized dual polarization and wideband microstrip antenna with technologies of cross slot coupling, stacked patches and two layers feeds is designed in this paper. The feed line, dual offset micros- trip line, and other technologies above can not only extend the bandwidth of the antenna, but also improve the stability of the input impedance. The dual layers feeds could decrease the size of the antenna and a- chieve a good isolation. The simulation and measurement results demonstrate that the two ports bandwidths that the VSWR is below 1.5 are 40% and 38.5%, respectively. Meanwhile the isolation between two ports in their bandwidths is more than 25 dB and the gain of the antenna will obtain the maximum value a- bout 9.1 dB. The operating frequency of the antenna is from 1 710 MHz to 2 170 MHz and due to the per- fect performance, small size and low profile height of the antenna, it could be made out to antenna array for mobile communication.