【摘要】 由于当前的单馈点双层微带天线存在着厚度过大,造成回波损耗过高等明显缺陷,难以同时实现较好的小型化和小周期特性。在深入研究相关特性的基础上,计算工作特性曲线,根据计算的特性曲线设计了一款双频段圆极化GPS微带天线,在考虑回波损耗的基础上,通过单个探针馈电到双层切角的微带天线贴片,改变贴片间空气层的厚度进而改变L1和L2的频率比值,满足低阻抗特性。利用电磁仿真软件HFSS 11进行仿真,仿真结果表明:利用双层微带天线的特性研究结果,可以设计出所需要的优化天线,阻抗带宽分别为57MHz(9.2%)和45MHz(5.7%),且具有较好的回波损耗特性和增益。在满足工程设计要求的同时,大大缩短了设计周期。更多还原

【Abstract】 Research the design optimization of dual- frequency circularly polarized microstrip antenna. The existed single feed point of double- layer microstrip antenna thickness is too big,higher apparent defects makes the return loss,where it is difficult to achieve miniaturization and small cycle characteristics. The paper designed a dual-band circular polarization GPS microstrip antenna. With a single probe feeding to the double chamfer of microstrip patch antenna,we changed the thickness of air layer between the patches,then changed the L1 and L2 frequency ratio to meet the low impedance characteristics. The simulation results show that the design has a good return loss characteristics and gain,which can meet the requirements of engineering design and greatly shorten the design cycle.更多还原