一种宽带圆极化贴片天线

A Wide Bandwidth Circularly-Polarized Patch Antenna

本文设计了一种宽带圆极化贴片天线,天线结构包括圆形辐射贴片、四个Y型馈电结构,一分四馈电网络,和四个L型寄生枝节。一分四馈电网络由二级级联的Wilkinson功分器和Schiffman宽带移相器组成,辐射天线通过四个Y型馈电结构对辐射贴片进行耦合馈电,在地板边缘加载L型寄生枝节调节天线阻抗匹配,展宽了天线的工作带宽,最终实现了在1.25～4.05GHz范围内VSWR<2,相对阻抗带宽达到106%,3dB轴比带宽达到92%。

A wideband circularly-polarized patch antenna is proposed in this paper. The antenna consists of circular patch, four printed Y-shaped coupling-fed stubs, a feed network, and four L-shaped parasitic stubs. The feed network consists of a Wilkinson Splitters by two cascade and a Schiffman phase shifter. The circular patch is coupling-fed by the four Y-shaped coupling-fed stubs and Four L-shaped parasitic stubs which is arranged around the ground to adjust antenna impedance matching to broaden the operating bandwidth. The antenna exhibits a fractional bandwidth of 106% with VSWR<2.0 ranging from 1.25 to 4.05 GHz, and the 3-dB axial ratio reaches to 92%.