一种枝节延伸的宽轴比波束圆极化天线

Branch Circularly Polarized Antenna with Wide Axial Ratio Beamwidth

为了拓展轴比波束宽度(ARBW),设计了一种枝节延伸的宽轴比波束圆极化天线。该天线通过加载短路针来改变电场分布,使得中心频点1.6 GHz不变的情况下,增大电尺寸,进一步拓宽ARBW。同时,利用枝节延伸的方法加强双层贴片的谐振,进而拓宽阻抗带宽。Ansys HFSS 15.0仿真结果表明:小于3 dB的ARBW在xoz面为160°,在yoz面为156°;相对阻抗带宽(|S 11|<-10 dB)为9.0%;轴比带宽为1.43 GHz(1.02~2.43 GHz),能够较好地应用于全球卫星导航系统的L频段。

In order to widen the axial ratio beamwidth(ARBW),a branch circularly polarized patch antenna is proposed.Shorting pins are loaded along two diagonals to short the lower patch and the ground plane,which change the field distribution beneath the lower patch due to shunt inductive effect.Further the electrical width with pins is increased at 1.6 GHz.And the ARBW is broadened.Furthermore,the match branch is applied for the lower patch to improve impedance bandwidth.The simulation results show that the ARBW of less than 3 dB is 160°in xoz-plane and 156°in xoy-plane.the relative impedance bandwidth(|S 11|<-10 dB)is 9.0%;the axial ratio(AR)bandwidth is 1.43 GHz(1.02~2.43 GHz),which can be better applied in the L-band of GNSS.