宽带微带天线阵的研究与设计

微带天线具有轻的重量、较小的体积及散射截面等特点，可设计为无线电高度表的天线。采用组阵的方式把矩形贴片单元组成宽频带，高增益的阵列天线，增加基板厚度扩展频带，良好的多枝节阻抗匹配获得较大增益。应用此结构设计四元微带天线阵，中心频率为4．3 GHz ，带宽BW＞200 M Hz ，采用等幅并联馈电的方式，通过 HFSS进行仿真优化，仿真结果显示驻波比小于2，最大增益为11．3 dB ，3 dB波束宽度约为46°。实测结果为：驻波比小于2频带扩展到4．08～4．52 GHz ，最大增益为10．33 dB ，达到设计要求。该天线阵简单的结构，良好的特性可运用到小型飞行器高度表系统中。

Research and design of broadband micro strip antenna array

The micro‐strip antenna has the advantages of small size ,light weight and low profile ,can be designed as a radio altimeter antenna .The rectangular patches are composed of broadband and high gain antenna array ,using the way of arraying .The increasing of the substrate thickness expand band and multi section impedance obtain large gains . This structure is applied to design the four element micro‐strip antenna array .The center frequency is 4 .3 GHz ,the bandwidth is more than 200 MHz .the method of equal amplitude parallel feed is adopted .According to HFSS the simulation results show that the maximum gain is 11 .3 dB ,the VSWR is less than 2 ,and the 3 dB beam width is about 46 degrees .The bandwidth is expanded to4 .08~4 .52 GHz ,and the maximum gain is 10 .33 dB .The structure of the antenna array is simple ,and its good characteristics can be applied to the small aircraft altimeter system .