一种P波段宽带双极化微带天线阵列

介绍了一种P波段宽带双极化微带天线单元及2元阵列的设计。天线单元设计中采用口径耦合理论和多层贴片结构,增大了天线的带宽,两个极化端口采用共面馈电;馈电网络设计中采用反相馈电技术有效抑制了交叉极化,采用短路耦合线实现反相馈电,降低了对天线带宽的影响。仿真结果表明,该天线阵实际增益达到11.8dB,水平极化端口在0.68～0.86GHz频率范围内驻波比小于2,相对带宽为24%;垂直极化端口在0.63～0.86GHz频率范围内驻波比小于2,相对带宽为30.6%,两端口隔离度高于40dB。

A Broadband Dual-Polarized Microstrip Antenna Array at P Band

A design of dual-polarized microstrip patch element and 2-element array with wide bandwidth for P-band application is presented in this paper. Aperture-coupled theory and stacked patch antenna architec- ture is adopted in the element design in order to increase the bandwidth. Both of the polarization ports are fed with a coplanar microstrip line. Short-circuited coupled-line technique is considered in designing the antiphase feeding network, which leads to lower cross polarization and less effect on impedance bandwidth. The simulated results show that the realized gain of the array reaches 11.8 dB. The relative impedance bandwidth is 24% from 0.68GHz to 0.86GHz for horizontal polarized port and 30.6% from 0.63GHz to 0.86GHz for vertical polarized port when VSWR is less than 2, while the isolation between the dual polarization ports is better than 40 dB.