一种面向无线通信应用的宽频带圆极化天线阵

提出了一种新型宽频带2×2方形缝隙槽圆极化天线阵。天线阵包含一个连续旋转馈电结构、4个非对称U型馈电枝节和一个方形槽接地板。与传统圆极化天线阵所采用的L型馈电枝节不同,首次提出了一种新型非对称U形馈电枝节来改善天线的圆极化性能。利用这些枝节和缝隙槽作为微扰元素,缝隙槽天线阵可以激发多重圆极化谐振模式,进而产生宽频带的圆极化辐射。测试结果表明,该天线阵3 dB轴比带宽为81.3%(1.75~4.15 GHz)而10 dB回波损耗达到88.6%(1.96~5.08 GHz)。此天线阵具有宽频带特性,在WLAN(2.4~2.48 GHz)和WiBro(2.3~2.39 GHz)等无线通信系统中有潜在的应用前景。

A New Wideband Circularly Polarized Antenna Array for Wireless Communication Applications

In this paper,a new wideband CP 2×2 square-slot antenna array is proposed.The antenna consists of a sequential rotation feeding structure,four asymmetric U-shaped feeding strip and a slot ground plane,which is formed by four square-slots with cut-corner,four rectangle-slots and L-shaped strips.Different from the traditional L-shaped feeding strip in the circularly polarized antenna array,an asymmetric U-shaped feeding strip is firstly presented to improve antenna performance.By using these strips and slots as perturbation elements,the square-slot antenna array can stimulate multiple circularly polarized radiation modes,which results in wideband circularly polarized radiation.Measured results demonstrate that the 3 dB axial-ratio(AR)bandwidth for AR<3 is 81.3%(1.75~4.15 GHz),and the 10 dB impedance bandwidth reaches 88.6%(1.96~5.08 GHz).The antenna will be a promising candidate in the application of WLAN(2.4~2.48 GHz)and WiBro(2.3~2.39 GHz)communication systems.