摘要
传统的自相移馈电四臂螺旋天线(QHA)由于最小回波损耗频点和最小轴比频点不在一个频率上,因此,难以在较宽的频带内同时满足良好的阻抗匹配和圆极化特性.虽然采用功分相移网络馈电可以解决上述问题,但是馈电网络尺寸普遍较大,难以应用于手持机上.本文提出了一种底部带有紧凑的功分相移馈电网络的四臂螺旋天线,可以在宽频带内实现四个输出端功率平衡输出,相位两两相差90度.所提出的馈电网络使得四臂螺旋天线既可以实现宽带圆极化辐射,又具有小尺寸,非常适合GPS、北斗移动手持设备的应用需求.
Conventional self-phasing method is difficult to achieve excellent impedance matching and circularly polarized （CP）radiation simultaneously over a wide band in q^drifilar helix antenna（ QHA）designs. This is because the lowest points of re- turn loss and axial ratio cannot match. Although QHA with additional feeding network can solve the problem above, the size is too large to be used in handset applications. In this paper, we proposed a QHA attached a compact feeding network on its bottom end to achieve balanced power division and q^drature phasing in a wide bandwidth. QHA with the proposed feeding network could achieve broadband CP radiation.Moreover,the configuration is compact and very suitable for GPS/CNSS portable mobile handset applica- tions.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2013年第4期722-726,共5页
Acta Electronica Sinica
基金
国家自然科学基金面上项目(No.61171029)
广州市科技计划项目(No.12C42081659)
