一种宽频带四单元微带天线阵设计*

综合运用了H型缝隙耦合馈电技术和引入空气层技术展宽了天线的频带,设计出一个工作在Ku波段的宽频带微带天线单元并组成四单元阵列。该天线由两层介质板构成,并利用180°反相馈电抑制了高次模的耦合激励,降低了交叉极化电平。使用三维电磁场仿真软件(Ansoft HFSS)对微带天线进行仿真优化,仿真结果表明,天线单元性能良好,相对阻抗带宽(S11≤-10 dB)为8.5%,增益为8.05 dB。四单元天线阵列相对阻抗带宽(S11≤-10 dB)达到16.6%,增益为13.7 dB。天线阵列性能良好,设计方法具有很好的可扩展性。归纳总结出的介电常数计算式也具有普遍性。

Design of four elements wide-band microstrip patch array antenna

This paper described a wide-band microstrip antenna and its 4 elements array antenna working at Ku-band.It adopted the H-shaped aperture-coupled feeding and inserting of the air layer technologies to achieve wider bandwidths.The antenna consisted of double-layered substrates.It applied the 180 degrees anti-phase feeding technique that contributed to suppress the higher order modes and decreased of cross-polarization.By using a software 3D electromagnetic field analysis(Ansoft HFSS),the microstrip antenna was simulated and optimized.The simulated results show that the antenna element’s relative impedance bandwidth is 8.5%,and the gain is 8.05 dB.The 4 elements array antenna’s relative impedance bandwidth is 16.6%,and the gain is 13.7 dB.So the performance of the antenna is very well and the method of designing has a good expansibility.The expressions of permittivity that concluded is prevalent.