一种新型射频识别读写器天线的仿真与设计  

Simulation and Design of Novel Antenna for RFID Reader/Writer Device

作　　者：易敏[1] 李书芳[1] 

机构地区：[1]北京邮电大学,北京100876

出　　处：《系统仿真学报》2009年第10期3123-3127,共5页Journal of System Simulation

基　　金：国家863计划(2006AA04A106);国家自然科学基金重点项目(60632030)

摘　　要：提出了一种由两组正交放置的双L天线构成的新型圆极化射频识别读写器天线,有效地克服了平面倒F天线缝隙加载等技术带来的两个谐振点频率相差大、带宽较窄的缺点。利用时域有限差分法对天线仿真和优化,天线的两个频段的中心工作频率分别位于我国分配给RFID技术使用的两个超高频频段内。在ISO/IEC推荐RFID使用频段内的反射损失小于-10dB,天线的相对带宽达到17%以上。优化3dB电桥馈电网络设计,在工作频段内为天线提供等功率、相位差为90°的激励信号,天线具有圆极化特性。仿真和测试结果表明:优化天线设计很好地缓解了天线带宽增加和天线效率下降的矛盾,在我国为RFID分配的频段内具有高的天线效率,并能够工作在ISO/IEC推荐使用的频段内,达到实用化要求。A novel antenna and feed networks were proposed for dual frequency of 840MHz-845MHz and 920MHz-925MHz application which was allocated for RFID use in China. The antenna is composed of two dual-L antennas orthogonally placed on a ground plane. Due to enhanced width, the antenna also can be applied to ultra high frequency of 860MHz- 960MHz that is proposed for RFID use by ISO/IEC. The feed networks which are used to attain circular polarization characteristics of the antenna were introduced to control horizontal and vertical radiation current flows for each dual-L antenna respectively. Simulation and measurement were performed and the frequency band with a return loss less than -lOdB was achieved.

关 键 词：射频识别 圆极化 平面倒F天线 超高频 时域有限差分法 

分 类 号：TN911.23[电子电信—通信与信息系统]