超高频RFID密集读写器临近信道抑制滤波器设计  

Design of Adjacent Channel Rejection Filter for UHF RFID Dense Reader

作　　者：柴永强[1] 胡圣波[1,2] 

机构地区：[1]贵州师范大学智能信息处理研究所,贵阳550001 [2]贵州省教育厅射频识别与传感网络工程中心,贵阳550001

出　　处：《电子器件》2013年第4期486-491,共6页Chinese Journal of Electron Devices

基　　金：国家物联网发展专项资金项目(2011081);贵州省RFID与传感网络科技创新团队;贵州省科技基金项目(黔科合J字LKS[2012]38号)

摘　　要：在密集读写器模式下,UHF RFID读写器邻近信道之间的频率干扰问题是影响RFID读写器性能的重要因素之一。在深入分析RFID系统标准协议EPC Cl G2的基础上,采用安捷伦ADS(Advanced Design System)软件,设计了临近信道抑制的密集读写滤波器。该滤波器采用4级子滤波器级联的方式,其中包括一个4阶椭圆低通滤波器、两个2阶车比雪夫高通滤波器和一个2阶车比雪夫低通滤波器。以减少信号对临近信道的干扰,可获得较好的幅频特性和更为峭陡的过渡带。测试结果表明:采用设计的密集读写滤波器后,UHF RFID读写器的读取率和识别率得到明显提高,并且可以降低密集部署读写器成本。In the dense-reader mode, the interference between adjacent channels of UHF RFID reader is one of the important factors affecting the performance of the RFID. Analyzing EPC C1 G2, the dense-reader mode （DRM）filter for adjacent channel rejection is designed using Aiglent ADS（Advanced Design System）software. The filter is composed of four filter stages： a 4th-order elliptic low-pass filter, two 2nd-order Chebyshev high-pass filters, and a 2nd-order Chebyshev low-pass filter. In order to reduce the interference between adjacent channels and gain better amplitude- frequency characteristic and steeper transitional band. The experiment results show that the read rate and the identifi- cation rate of DRM UHF RFID is greatly improved,and the cost of dense deployment is reduced using the DRM filter.

关 键 词：临近信道抑制 密集读写器 级联滤波器 零中频接收机 

分 类 号：TN914[电子电信—通信与信息系统]