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首页> 外文期刊>IEEE Transactions on Antennas and Propagation >Design of License Plate RFID Tag Antenna Using Characteristic Mode Pattern Synthesis
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Design of License Plate RFID Tag Antenna Using Characteristic Mode Pattern Synthesis

机译：基于特征模式模式综合的车牌RFID标签天线设计

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摘要

A novel design of the passive license plate radio frequency identification tag antenna in UHF band based on the characteristic mode theory (CMT) is proposed in this paper. The license plate is operated as a tag antenna since it is conductor (made of aluminum). A desired up-tilted pattern beam is achieved successfully by using a direct CMT-based radiation pattern synthesis procedure. The pattern can be expanded as a superposition of some specific characteristic modes pattern, which is identified according to characteristic mode analysis of the plate. Four coupling slots are exploited to excite the selected modes current distribution. The mode weighting coefficients can be tuned to form the desired pattern beam by changing the relative phase between the coupling slots. The feed structure is carefully designed without damaging the layout of characters and numbers on the license plate. The synthesized radiation pattern corresponds with the pattern simulated by HFSS. The measured radiation pattern proves that the proposed design is reliable and applicable. The measured read range is about 20 m, which can satisfy the actual requirements.
机译：提出了一种基于特征模式理论的超高频无源牌照射频识别标签天线的设计方案。车牌是导体（由铝制成），因此可用作标签天线。通过使用基于CMT的直接辐射方向图合成过程，可以成功实现所需的向上倾斜方向图光束。该图案可以扩展为某些特定特征模式图案的叠加，这些特征模式是根据板的特征模式分析确定的。利用四个耦合槽来激发所选模式的电流分布。可以通过改变耦合槽之间的相对相位来调整模式加权系数以形成所需的图案光束。提要结构经过精心设计，不会损坏车牌上字符和数字的布局。合成辐射图与HFSS模拟的图相对应。实测辐射图证明了所提出的设计是可靠和适用的。测量的读取范围约为20 m，可以满足实际要求。

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