宽带高增益圆极化微带天线与阵列

设计了一副宽带高增益圆极化微带天线，并进行组阵分析。天线中心频率2.6 GHz，通过增加寄生贴片和空气层来提高天线单元的增益和带宽。上下两层介质板上边长不同的切角方形贴片分别激励一个低频与高频的圆极化模，有效地拓宽了轴比带宽。仿真结果表明，反射系数|S11|<-10 dB带宽21.8%，3 dB轴比带宽12.0%，中心频率点增益9.0 dBi。对天线单元进行加工测试，与仿真结果较为吻合。设计了2×4元阵列，并进行了仿真，增益提升至17.5 dBi，3 dB轴比带宽10.4%。

Circularly polarized wideband microstrip antenna with high gain and array design

A circularly polarized wideband microstrip antenna with high gain and array is presented. In order to achieve wideband and high gain, a parasitic patch and the air layer are added to the antenna which works at 2.6 GHz center frequency. Two square patches with different sizes on two dielectric layers are corner-truncated with perturbation to excite circular polarization operation at a low and a high frequency, respectively, which effectively broadens the axial ratio bandwidth. The simulated bandwidth is 21.8% with the reflection coefficient |S11|<-10 dB, the 3dB axial ratio bandwidth is 12.0%, the gain is 9.0 dBi at center frequency. The prototype is fabricated, and the measurement results coincide with those of the simulation. A 2×4 antenna array is designed, the simulated gain goes up to 17.5 dBi and the 3 dB axial ratio bandwidth maintains 10.4%.