一种全向圆极化微带天线

Circularly Polarized Microstrip Antenna with an Omnidirectional Pattern

介绍了一种平面结构的全向圆极化微带天线。天线由两个带有简并分离单元的矩形贴片组成,两个贴片背靠背地分布在共面波导的上、下两面。天线基片宽度较窄,导致天线在方位面内实现全向辐射。设计并实测了一个工作于Ku波段的天线,实测的阻抗带宽达到5.4%,天线在方位面的圆极化轴比均小于2.8 dB。该研究为下一步进行毫米波全向圆极化天线的研究奠定了基础。

A new configuration for a circularly polarized microstrip antenna with an omnidirectional pattern is proposed. This antenna consists of two rectangular patches with perturbation segments,which are arranged back- to- back relative to a Coplanar Waveguide （CPW） on a ground plane. The width of the substrates and ground plane is narrower than that of the conventional unidirectional rectangular patch,which makes this antenna radiate omnidirectional wave in azimuth plane. An antenna with proposed structure at Ku - band is designed, Measured results show that the proposed antenna can an input impedance bandwidth of 5.4% and axial ratio less than 2.8dB in azimuth plane. This design contributes great help to the next research on millimeter wave circularly polarized antenna with an omnidirectional pattern.