一种频带展宽的小型化左手偶极子天线的设计  

Design of a miniaturized and bandwidth-extended dipole antenna with left-handed loading

作　　者：曹卫平[1] 郑斯萍[1] 李思敏[1] 高喜[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《电子元件与材料》2012年第4期33-36,共4页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.61071018);广西无线宽带通讯与信号处理重点实验室主任基金资助项目(No.11110)

摘　　要：左手传输线加载偶极子（简称左手偶极子）可以有效实现天线的小型化，但是这种天线通常带宽窄、效率低。通过采用一种渐变的梯形网络结构代替传统的非渐变的结构形式来改善天线的阻抗特性，设计了四单元的左手偶极子天线，进而拓展了天线的带宽，天线总长度为0．2五。仿真和实物测试结果显示：天线同时工作在-1阶和-3阶谐振模式，│S11│≤-10dB的阻抗带宽达到6．5％，在工作频段内（571-610MHz），天线的增益不小于-4．25dBi，效率大于25％。Dipole loaded with left-handed transmission lines （LH dipole） can effectively achieve the miniaturization of antennas. However, this type of antennas usually possess the narrow bandwidth and the low radiation efficiency. A four-cells LH dipole antenna with extended bandwidth was designed using a gradual changing ladder network structure to replace traditional non-gradual changing structure. The length of the antenna was 0.2 ,~. The simulating and measure results show that the antenna simultaneously works at both -1 order and -3 order resonant modes, and the impedance bandwidth for │S11│≤-10 dB achives 6.5%. Besides, in the working frequency range of 571-610 MHz, the gain of the prepared antenna is greater than -4.25 dBi, and the efficiency is higher than 25%.

关 键 词：偶极子天线 左手传输线 渐变结构 

分 类 号：TN82[电子电信—信息与通信工程]