一种S波段宽带单极八木天线

S-band Wideband Monopole Yagi Antenna

在传统单极八木天线的基础上进行改进,在单极子左右两端放置寄生单元增加了驻波带宽,把天线引向器长度设计成非均匀扩展了方向图带宽,在反射器后面放置一个反射板进一步提高了低频增益。使用Ansoft HFSS软件对天线进行了建模仿真并加工了实物进行测试,实测反射系数S11在2.2 GHz^5.2 GHz频带内小于-10 d B,相对带宽达到81%。增益方向图在2 GHz^4 GHz频带内不发生畸变,相对带宽66.7%。实测结果在3.9 GHz处达到最大增益11 d B,端射特性明显,仿真与实测结果吻合很好。

A novel amelioration based on a traditional monopole Yagi antenna is introduced. The VSWR'S bandwidth has been extend- ed by putting two parasitic elements beside the excited monopole and the radiation pattern's bandwidth has also been extended with different heights of the directors. The gain at the low frequency has further increased with a metal plate behind the reflector. The an- tenna is simulated using HFSS , manufactured and measured in darkroom , the S11 parameter is below - 1 0 dB between 2. 2 GHz ~ 5.2 GHz making the relative bandwidth up to 81%. The radiation pattern works well, there's no distortion between 2 GHz ~4 GHz making the relative bandwidth up to 66.7 %. The maximum of the gain is above 11 dB at 3.9 GHz with notable performance of end- fire. The measured results and the simulated results agree well.