基于MEMS开关的方向图可重构天线的设计  

Design of pattern reconfigurable antenna based on MEMS switch

作　　者：崔奉云[1] 李林翠[1] 张黎[1] 杨春[1] 张文涛[1] 

机构地区：[1]中国工程物理研究院电子工程研究所,四川绵阳621900

出　　处：《信息与电子工程》2011年第4期444-448,共5页information and electronic engineering

基　　金：中国工程物理研究院科学技术发展基金资助项目(2008B0403041)

摘　　要：设计了一种波束可重构天线,以实现宽带、宽角方向图可重构设计。该天线由4组具有不同波束指向的天线子阵组成,通过6个RF-MEMS开关控制其波束指向;采用的宽带单元天线,在2.4 GHz～3.4 GHz频率范围内(相对带宽34.5%),电压驻波比小于2。馈电网络的设计采用小型化宽带阻抗变换器,减小了馈电网络尺寸,并拓展了带宽。仿真结果表明,可重构天线实现了0°,25°,40°和50°的不同波束指向,除部分频点外,4种状态天线的驻波在2.5 GHz～3.25 GHz(相对带宽26%)带宽内驻波比均小于2。Abstract： This paper presents a broadband and wide-angle pattern reconfigurable antenna. The antenna is composed of four different linear arrays, in which the element is designed with different phase shift. The pattern of the whole antenna can be changed by the RF-MEMS switch, which is placed in the feed network. The feed network uses a novel compact broadband impedance transformer, and the microstrip slot antenna acts as an antenna element. The VSWR of the antenna element in a broadband from 2.4 GHz to 3.4 GHz is less than 2. The simulation result demonstrates that the reconfigurable antenna realizes different patterns（0°,25°,40°and 50°） in different RF-MEMS switching states, furthermore, the VSWR of the reconfigurable antenna under each of these four different states is less than 2 from 2.5 GHz to 3.25 GHz excerpt for Dart freouencv noints.

关 键 词：RF-MEMS开关 可重构天线 微带缝隙天线 宽带阻抗变换 

分 类 号：TN820.12[电子电信—信息与通信工程]