具有二次Koch分形边界的圆极化微带天线  

Circularly Polarized Microstrip Antenna with Quadratic Koch Fractal Boundary

作　　者：林澍[1,2] 张雪莹[2] 王宇碟[2] 刘圣英[2] 邱景辉[2] 王进祥[3] 

机构地区：[1]哈尔滨工业大学电子科学与技术博士后科研流动站,黑龙江哈尔滨150080 [2]哈尔滨工业大学电子与信息工程学院,黑龙江哈尔滨150080 [3]哈尔滨工业大学微电子科学与技术系,黑龙江哈尔滨150080

出　　处：《现代电子技术》2011年第2期93-95,共3页Modern Electronics Technique

基　　金：黑龙江省博士后资助经费项目(BH-Z09187)

摘　　要：设计了一种单馈点圆极化微带天线。微带贴片采用二次Koch分形边界的贴片结构,通过底馈方法激励起两个相互正交的简并模实现圆极化;采用CST Microwave Studio R软件进行了仿真,其结果表明,在微带贴片的对角线上适当位置用探针馈电,可以实现圆极化辐射。对具有介质损耗的天线进行了仿真,结果与理想介质的差异较大。设计了一个右旋圆极化微带天线,并进行了测试。该天线工作于1.575 GHz;VSWR小于2的阻抗带宽为51 MHz;轴比为4 dB;增益为3.8 dB;贴片尺寸为42.4 mm×42.4 mm,可以用作GPS天线。A Koch fractal boundary circularly polarized microstrip antenna with single feeding point is presented. The microstrip patch has a quadratic Koch fractal boundary structure which stimulates two orthogonal degenerate modes to realize circular polarization by feeding at the bottom. The antenna simulation is performed with CST Microwave Studio software. The simulation results show that the antenna can realize the characteristic of circular-polarization with the feeding position on the diagonal line of the patch. The antenna with dielectric loss of board is simulated, and the results differ from those in perfect dielectric, which is embodied in the de- crease of the gain and the increase of axial ratio. A dextrorotatory circularly polarized microstrip antenna is proposed and tested, which works at 1. 575 GHz with impedance bandwidth of 3.2% at VSWR less then 2, and whose axial ratio is 4 dB and gain is 5 dB. The size of the antenna is 42.4 mm×42.4 mm, and it can be used as GPS antenna.

关 键 词：微带天线 圆极化 KOCH分形 GPS 

分 类 号：TN82-34[电子电信—信息与通信工程]