一种双频带涡旋电磁波微带天线

A Dual-Band Microstrip Antenna Generating Vortex Electromagnetic Waves

本文提出了一种能工作于X波段的双频带涡旋电磁波微带天线.该天线由双面均匀圆形天线阵列Uniform Circular Antenna Array(UCA)和相移馈电网络组成.通过旋转下层的UCA,使之与上层UCA夹角为α,可以实现双频带工作模式;另外,相移馈电网络使天线相邻贴片单元的相位在两个频率处均依次改变-45°,实现了双频带涡旋电磁波辐射.实验结果表明:天线双频带工作带宽为0.85 GHz(7.8~8.65GHz)和0.35GHz(9.9~10.25GHz),且实现了模态数l=+2的双频涡旋电磁波.

A dual-band microstrip antenna generating vortex electromagnetic waves at X band is proposed in this paper.The antenna consists of two sided Uniform Circular Antenna Arrays（UCA）and a phase shift feeding network.Dual-band operating mode can be achieved by roating the ground UCA which forming an included angle ofα.In addition,with the effect of the feeding network,the phase shift of the adjacent patches is -45°,thus Dual-band vortex electromagnetic waves are generated.The experimental results show that the bandwidths of the dual-band antenna are 0.85 GHz（7.8~8.65 GHz）and 0.35 GHz（9.9~10.25 GHz）,and mode number of the vortex electromagnetic waves is ＋2.