A tuning transformer for the automatic adjustment of resonant loop antennas in RFID systems

被引：0

作者：

Steiner, G ^{[1
]}

Zangl, H ^{[1
]}

Fulmek, P ^{[1
]}

Brasseur, G ^{[1
]}

机构：

[1] Graz Univ Technol, Inst Elect Measurement & Measurement Signal Proc, Christian Doppler Lab Automot Measurement Res, A-8010 Graz, Austria

来源：

2004 IEEE International Conference on Industrial Technology (ICIT), Vols. 1- 3 | 2004年

关键词：

loop antenna; resonance tuning; RFID; tunable inductance;

D O I：

暂无

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Radio Frequency Identification (RFID) systems allow contactless communication between a small portable tag and a reader device. In this paper, we address the problem of performance degradations due to the detuning of resonant reader antennas in the widely used 13.56 MHz frequency band. A novel design of a tuning transformer for the adjustment of the center frequency of resonant loop antennas is proposed. The ferrite core of the transformer is premagnetized using an additional DC winding. The HIP and DC windings are decoupled by an iron core. Besides the tuning, the transformer may also be used for impedance matching and for balancing an unbalanced signal. The function of the device was proven by network measurements.

引用

页码：912 / 916

页数：5

共 9 条

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