Automatic Antenna Tuning Unit to Improve RFID System Performance

被引：15
|
作者：
Wegleiter, Hannes [1 ]
Schweighofer, Bernhard [1 ]
Deinhammer, Christian [1 ]
Holler, Gert [1 ]
Fulmek, Paul [2 ]
机构：
[1] Graz Univ Technol, Inst Elect Measurement & Measurement Signal Proc, A-8010 Graz, Austria
[2] Vienna Univ Technol, Inst Sensor & Actuator Syst, A-1040 Vienna, Austria
来源：
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 2011年 / 60卷 / 08期
基金：
奥地利科学基金会;
关键词：
Antenna accessories; impedance matching; loop antennas; magnetic devices; magnetic-variable control;
D O I：
10.1109/TIM.2011.2122390
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Systems for radio-frequency identification (RFID) realize a bidirectional wireless communication between a reader device and cheap passive tags (e. g., an RFID chip with an antenna printed on badges for access-control systems) in the near field of an antenna. This paper deals with the automatic and fast tuning of the resonant reader antennas in the widely used 13.56-MHz frequency band, resulting in a performance improvement and an increased READ/WRITE range. A novel RFID reader system is proposed with a tuning transformer for the automatic adjustment of the resonant circuit center frequency. This is achieved by shifting the magnetic operating point (i.e., the biasing direct-current (dc) magnetization) of a Ni-Zn ferrite transformer by means of an additional dc winding. The operation principle and the performance potential of this device are demonstrated by measurements on a prototypical RFID system.
引用
收藏
页码：2797 / 2803
页数：7
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