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

页码：2797 / 2803

页数：7

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