一种高增益分形微带阵列天线

采用2阶皮亚诺分形曲线,设计了一种具有高增益端射特性的微带阵列天线。该阵列天线由多段皮亚诺分形曲线组成,通过添加微带相移器,分形曲线构成了一个偶极子天线阵列。文中介绍和分析了该分形阵列天线的工作原理、结构和主要参数对性能的影响。设计并制作了一只工作于5.8 GHz的分形阵列天线,仿真和测试结果表明,该天线具有良好的辐射特性,其端射增益达19 dB,旁瓣＜-12 dB,交叉极化＞30 dB,天线口径效率超过90%。

A High Gain Microstrip Array Antenna Using Fractal Structure

By using the second iteration Peano curve,a microstrip array antenna with high gain and end-fire characteristics is proposed.This array antenna consists of several Peano fractal curves,in which some microstrip phase shift sections are inserted to create a dipole array.The principle of this fractal array is introduced,and the effects of some important structural parameters on the antenna's performances are analyzed.Finally,a proposed fractal array antenna working at 5.8 GHz is designed and fabricated.Both simulated and measured results show that the antenna has excellent radiation performances,e.g.the end-fire gain is 19.0 dBi,the side-lobes are approximately 12 dB below the main lobe,the cross-polarization level is less than -30 dB,and especially the array's aperture efficiency is greater than 90%.