【摘要】 提出了一款高增益低副瓣新型圆极化微带天线阵。单元天线采用叠层切角圆极化微带结构，通过八边形边界布局和顺序旋转交叠组阵技术，实现了天线阵方向性图的对称性和圆极化辐射性能的最优化；馈电网络采用威尔金森功分器和最大平坦式阻抗变换器实现不等功分宽带阻抗匹配，通过改进馈电方向寻求对称结构，简化了馈电网络的设计。制作了天线阵实物并进行了测量。测试结果表明：天线在3.2～4.6 GHz频段内S₁₁<-10 dB,阻抗相对带宽36%;在3.8～4.5 GHz频段内顶点轴比小于3 dB,圆极化相对带宽17%;在4～4.4 GHz频段内天线增益均在15 dB以上，最高增益达17 dB。更多还原

【Abstract】 A novel circularly polarized microstrip antenna array was proposed with high gain and low sidelobe. The antenna elements adopted corner truncated circularly polarized stacked microstrip structure. The symmetry of the antenna array directivity diagram and the optimization of the circularly polarized radiation performance were realized by an octagonal boundary layout and sequential rotation overlapping array techniques. The feed network adopted a Wilkinson power divider and a maximum flat impedance converter to achieve unequal power division and broadband impedance matching. The design of the feed network was simplified by adjusting feed direction to seek a symmetrical structure. The antenna array was then fabricated and measured. The test results show that S₁₁ is less than-10 dB from 3.2 GHz to 4.6 GHz with relative impedance bandwidth of 33%. From 3.8 GHz to 4.5 GHz, the zenith axial ratio is less than 3 dB, and the relative circular polarization bandwidth is 17%. From 4 GHz to 4.4 GHz, the antenna gain is above 15 dB with maximum value of 17 dB.更多还原