一种四态极化捷变宽带微带天线线阵  

A wide band four-states of polarization-agility linear microstrip antenna array

作　　者：王昊[1] 鲁勇[1] 方大纲[1] 戴永胜[1] 

机构地区：[1]南京理工大学毫米波技术研究室,江苏南京210094

出　　处：《电波科学学报》2008年第2期211-215,共5页Chinese Journal of Radio Science

摘　　要：四态极化捷变宽带微带天线线阵由八个单元组成。单元采用双馈点口径耦合微带贴片。这种辐射单元具有宽频带以及两馈点之间高隔离度的特性。通过改变连接合成通道的移相器的相位，可以实现水平线极化，垂直线极化、左旋圆极化和右旋圆极化四种极化态。实测的数据表明，在四种极化状态下阵列在8～10．95GHz的频率范围内都满足VSWR〈1．5，在8．85～10．95GHz的频率范围内阵列的圆极化轴比优于6dB，线极化的交义极化优于-10dB，按10GHz的中心频率计算，带宽均为19％。该线阵也可用于柱抛物面天线的初级馈源，或通过适当的馈电网络组成二维阵。A wide-band four-states of polarization-agility microstrip linear antenna array being composed of 8 elements is proposed in this paper. For increasing the bandwidth and improving isolation between two feed points, each element of aperture coupled microstrip patch is of two feed points. Through changing the phase shifters in the resultant channels, the four-states of polarization （vertical, horizontal, left circular and right circular） may be realized. The measured results show that with all the polarization states within 8 GHz to 10.95 GHz, the VSWR is less than 1.5, the axial ratio of circular polarization is better than 6dB and the cross polarization of linear polarization is lower than -- 10 dB within 8.85 GHz to 10. 95 GHz. Both of the frequency bandwidths are 19% based on the central frequency 10 GHz. This linear array may also be used as the primary feeder of the cylindrical parabolic reflector antenna or to form a two dimensional antenna array by using proper feed network.

关 键 词：极化捷变 微带天线 宽频带 

分 类 号：TN911.7[电子电信—通信与信息系统]