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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >Linearly tapered meander line cross dipole circularly polarized antenna for UHF RFID tag applications
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Linearly tapered meander line cross dipole circularly polarized antenna for UHF RFID tag applications

机译：用于UHF RFID标签应用的线性锥形曲折线交叉偶极圆极化天线

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摘要

In this article, a circularly polarized antenna for ultra-high frequency radio frequency identification (RFID) tag is presented. The circular polarization is realized by two orthogonal, unequal length linearly tapered meander line cross dipoles. The meander structure with capacitive tip loading is used for size miniaturization of the antenna. A modified T-match network is employed to feed the cross dipole structure. The measured 10-dB return loss bandwidth of the cross dipole antenna is 17 MHz (908-923 MHz) and the corresponding 3-dB axial ratio bandwidth is 6 MHz (912-918 MHz). The overall size of the proposed antenna is 0.17 lambda(0) x 0.17 lambda(0) at 915 MHz. The maximum read range between the reader and the tag with the proposed antenna is 4.7 m larger than the analogous linearly polarized tag antenna due to the reduction in polarization loss between the tag and reader antennas. Thus, a maximum read range of 15.66 m with the gain of 1.28 dBic is achieved at 915 MHz.
机译：在本文中，呈现了用于超高频射频识别（RFID）标签的圆极化天线。圆形偏振由两个正交，不平等长度的线性锥形曲折线交叉偶联。具有电容尖端载荷的曲折结构用于天线的尺寸小型化。用于修改的T匹配网络用于馈送十字偶极结构。十字偶极天线的测量的10-DB回波损耗带宽为17 MHz（908-923MHz），相应的3-DB轴向比带宽为6MHz（912-918MHz）。所提出的天线的总体尺寸为0.17λ（0）×0.17λ（0），在915 MHz。由于标签和读取器天线之间的偏振丢失降低，读取器和具有所提出的天线之间的标签之间的最大读取范围是比类似的线性偏振标签天线更大的4.7米。因此，在915MHz下，实现了1.28 dBic增益的最大读取范围为15.66米。

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