用于RFID应用的弯曲交叉偶极子天线

2013 IEEE International Workshop on Electromagnetics, Applications and Student Innovation Competition Pub Date : 2013-08-01 DOI:10.1109/IWEM.2013.6888797

Wei He, Yejun He, H. Wong

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引用次数: 0

摘要

提出了一种圆极化超高频RFID标签天线。这种天线是由一个蜿蜒的交叉偶极子来实现的。偶极子的弯曲结构可以调节交叉偶极子的两个正交臂的幅值和相位，从而通过相互正交的模式产生CP频率。因此，我们可以从标签上实现CP操作。当标签的输入阻抗与RFID芯片的阻抗共轭匹配时，可以获得最大的传输功率。本设计采用一种特殊的匹配结构来控制标签的输入阻抗。该标签天线设计覆盖整个UHF频段(840-960 MHz)，其3db轴向比(AR)带宽为43 MHz (905-948 MHz)。

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Meandering cross dipole antenna for RFID applications

A circularly polarized (CP) UHF RFID tag antenna is proposed in this paper. This antenna is realized by a meandering cross dipole. The meandering structure of the dipole could adjust amplitudes and phases from the two orthogonal arms of the cross dipole such that a CP frequency would be generated by the mutually-orthogonal mode. Therefore, we can achieve CP operation from the tag. The maximum transmitted power can be obtained when the input impedance of the tag is conjugate-match with the impedance of the RFID chip. A special matching structure is employed in this design to control the input impedance of the tag. This tag antenna is designed to cover whole UHF band (840-960 MHz), and its 3-dB axial-ratio (AR) bandwidth is 43 MHz (905-948 MHz).

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来源期刊

2013 IEEE International Workshop on Electromagnetics, Applications and Student Innovation Competition

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