应用于无芯片电子标签的双频天线  

Dual-band antenna applied in chip-free RFID

作　　者：李勇[1] 邹传云[2] 姚捃[1] 刘泰兴[3] 

机构地区：[1]成都理工大学工程技术学院,四川乐山614007 [2]西南科技大学信息工程学院,四川绵阳621010 [3]四川信息职业技术学院,四川广元628017

出　　处：《重庆邮电大学学报（自然科学版）》2014年第4期455-459,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61075030);四川省教育厅基金(14ZB0357)~~

摘　　要：由于无芯片电子标签是以声表面波技术进行通信,为使天线与叉指换能器便于集成一体,且具有高增益、覆盖2个免申请频段,设计了一款小型化印刷偶极子天线。通过在介质板双面印刷两对偶极子臂,并调节各自的电长度使其分别对应2个谐振点;采用指数渐变巴伦馈电来减小回波损耗,并在模拟地板上开2条对称缝隙来提高增益。实验结果表明,天线完全覆盖5.8 GHz与2.45 GHz 2个免申请频段;渐变巴伦馈电方式最高可以降低回波损耗24.5 dB,地板开缝结构可以提高方向图增益至少24.1%;天线的尺寸为32 mm×19 mm。最终实现了小型化、高增益、双频段的设计目的。Because of Chip-free RFID communicating based on surface acoustic wave technology, in order to integrate antenna with inter-digital transducer conveniently, and let it has big gain and two free application spectrum, this paper designs a miniaturized printed dipole antenna, by printing two pairs of dipole arms on both sides of the dielectric-slab, and adjusting their own electrical length to correspond with the two resonant point. An exponential gradient Balun feeding model is adopted to reduce the return loss, and two symmetric cracks on the simulation floor are made to improve the gain. The experimental result shows ： the antenna completely covers two ISM frequency bands ： 5.8 GHz and 2.45 GHz ; gradient Bal- un feeding way can reduce return loss 24.5 dB at most ; the floor slotting structure can at least improve 24.1% gain of the directional diagram. The size of the antenna is： 32 mm× 19 mm. Finally realizes the miniaturization, big gain, double spectrum.

关 键 词：偶极子天线 渐变巴伦 对称缝隙 免申请频段 小型化 

分 类 号：TN821.4[电子电信—信息与通信工程]