摘要
提出了一种S波段宽带圆极化微带天线。该天线采用切角方形贴片实现圆极化辐射,利用差分馈电抑制高次模改善轴比,通过贴片上开双十字槽和增加空气层扩展带宽。矩形贴片尺寸为38 mm×38 mm,天线高度为14.7 mm。测试结果表明该天线在实现宽带工作的同时具有良好的圆极化特性,同时满足反射系数S11≤-10 d B和轴比AR≤6 d B的有效带宽为22.3%。
A broadband circularly polarized microstrip antenna is proposed at S band in this paper. A truncated-corner patch is adopted to realize circular polarized radiation. The high-order mode is suppressed by the differential feed to improve the axial ratio. The bandwidth is further broadened by inserting an air layer between two substrates and etching double cross slots on the truncated-corner patch. The size of rectangular patch is 38 mm × 38 mm and the antenna height is 14. 7 mm.Measured results show that the proposed antenna has good broadband characteristic,along with desirable radiation performance during the bandwidth. The effective bandwidth of the reflection coefficient S11≤-10 d B and axial ratio AR≤6 d B is22. 3%.
出处
《微波学报》
CSCD
北大核心
2017年第4期36-40,共5页
Journal of Microwaves
基金
国家自然科学青年基金(61401208)
关键词
微带天线
宽频带
圆极化
差分馈电
180°相移
microstrip antenna
broadband bandwidth
circularly polarized
differential feeding
180° phase shifter
