低成本宽带高效率堆叠贴片天线

为克服合成孔径雷达中现有微带天线带宽窄、效率低、成本高的缺陷，提出了一种在低成本FR4基板上实现的X波段宽带高效堆叠微带贴片天线。天线通过多层FR4基板堆叠方式构成，通过空气腔的引入，天线的有效介电常数和介质损耗得到降低，天线的效率和带宽得到提升。利用寄生贴片在带内增加了谐振点，使得天线的带宽得到进一步增大。同时为补偿馈电探针的寄生电感，利用微带匹配器对天线的输入阻抗进行匹配。实测表明，天线输入驻波低于2.0的频率范围为7.7~11.7GHz，相对带宽大于40%。天线的增益为7.6dBi，效率为83%。与传统微带贴片天线相比，具有宽带、高效、低成本的特点，具有一定应用前景。

Low-cost wideband high-efficiency stacked patch antenna

In order to overcome the defects of narrow bandwidth, low efficiency and high cost of existing microstrip antennas, an X-band broadband and efficient stacked microstrip patch antenna is proposed on a low cost FR4 substrate. The antenna is composed of multilayer FR4 substrate stacks. Through the introduction of air cavity, the effective dielectric constant and dielectric loss of the antenna are reduced, and the efficiency and bandwidth of the antenna are improved. The use of parasitic patches increases the reflection zero in the band, which further enhances the bandwidth of the antenna. At the same time, in order to compensate the parasitic inductance of the feed probe, the input impedance of the antenna is matched by microstrip line. Simulation and experimental results show that the frequency range of input VSWR less than 2.0 is 7.8~11.6GHz, and the relative bandwidth is 40 %. The antenna gain is 7.6dBi and the efficiency is 83%. Compared with the traditional microstrip patch antenna, it has the characteristics of broadband, high efficiency and low cost, and has broad application prospects.