【作者】 徐云学； 苏凯； 周媛媛； 惠政桥；

【Author】 XU yunxue;SU kai;ZHOU yuanyuan;HUI zhengqiao;XIDIAN UNIVERSITY;

【机构】 西安电子科技大学；

【摘要】 本文提出了一种基于倒L形天线的双频共口径圆极化天线。通过将四个倒L形天线依次旋转90°排布,相位依次滞后90°馈电,再双层叠放,构成了一个双频圆极化天线。在此基础上,通过在低频天线下方添加频率选择表面(FSS)来削减低频天线结构中的金属对高频天线圆极化轴比的恶性影响,使此双频天线的高频段轴比大幅度降低。双频天线的工作频段为1.638 GHz～1.76 GHz和3.387 GHz～3.513 GHz,相对带宽分别为7.18%和3.652%,相比于未添加FSS,3 dB轴比波束宽度提高了87.3%。更多还原

【Abstract】 This paper presents a dual-frequency common-aperture circularly polarized antenna based on an inverted L-shaped antenna.By rotating four inverted L-shaped antennas 90° in sequence and feeding them with a phase lag of90° in sequence,and then stacking them in double layers,a dual-frequency circularly polarized antenna is formed.On this basis,by adding a frequency-selective surface(FSS)below the low-frequency antenna,the adverse influence of metals in the low-frequency antenna structure on the circular polarization axis ratio of the high-frequency antenna is reduced,significantly lowering the high-frequency band axis ratio of this dual-frequency antenna.The operating frequency bands of the dual-band antenna are 1.638 GHz to 1.76 GHz and 3.387 GHz to 3.513 GHz,with relative bandwidths of 7.18% and 3.652% respectively.Compared with the absence of FSS,the beam width at the 3 dB axis ratio has increased by 87.3%.更多还原