共面波导馈电的新型圆极化天线阵列

Circularly Polarized Antenna Array Fed by CPW-Slot Network

摘要:

本文提出了一种新型共面波导（CPW）馈电的1×2圆极化阵列天线及改进后的2×2阵列天线。为了改善阵列天线的圆极化轴比带宽，将顺序旋转馈电技术与共面波导-槽线馈电网络相结合，设计了用于微带贴片天线的新型馈电网络。仿真与实测结果证明，该类型的馈电网络可以同时改善阵列天线的阻抗带宽与轴比带宽。实测结果表明，1×2线阵的阻抗带宽与轴比带宽分别为3.79％和16.41％。2×2面阵的阻抗带宽与轴比带宽分别为3.61％和10.83％。

Abstract:

A novel design of a 1×2 and a 2×2 circularly polarized (CP) microstrip patch antenna arrays is presented in this paper. The two CP antenna arrays are fed by sequentially rotated coplanar waveguide (CPW) to slotline networks. The mechanism of circular polarization in this design is explained and the measured results shows that this kind of CPW feeding network is a good method to improve both the impedance bandwidths and 3-dB axial ratio bandwidths of CP antenna arrays. The simulated and measured impedance bandwidths and 3-dB axial ratio bandwidths of the 1×2 linear array are 3.79％ and 16.41％. Moreover, The simulated and measured impedance bandwidths and 3-dB axial ratio bandwidths of the 2×2 array are 3.61％ and 10.83％.