一种单馈小型化宽波束双层圆极化微带天线

摘要

A compact single feed double layer circularly polarised microstrip antenna with low permittivity substrate is designed,centre cross-slot and peripheral cuts on each patch is proposed.The size of the antenna is reduced by four cutting slots.Centre cross-slot can improve the bandwidth,while peripheral cuts and proper feed location can realise circularly polarise of the antenna.As contrast to conventional microstrip antenna,the area of which is decreased approximately 37%.The antenna has a 800 beam width and a good gain performance,which is higher than 5.3 dB.%设计出一种单馈小型化宽波束双层圆极化微带天线,通过选取低介电常数的介质基片,在双层圆形贴片上分别刻四个槽减小天线的尺寸,中心开十字缝增加天线的阻抗带宽,在贴片边切角和贴片的对角线上选择合适的馈电位置实现圆极化,天线尺寸减少37%,天线方向图对称性好,波束宽度大于80°,增益大于5.3 dB。