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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：线性锥形曲折线交叉偶极子圆极化天线，用于UHF RFID标签应用

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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，提出了一种用于超高频射频识别（RFID）标签的圆极化天线。圆极化是通过两个正交的，不等长的线性渐缩曲折线交叉偶极子实现的。具有电容性尖端负载的曲折结构用于天线的小型化。修改后的T匹配网络用于馈送交叉偶极子结构。交叉偶极天线的测得的10 dB回波损耗带宽为17 MHz（908-923 MHz），相应的3 dB轴向比率带宽为6 MHz（912-918 MHz）。拟议天线的整体尺寸在915 MHz时为0.17 lambda（0）x 0.17 lambda（0）。由于标签和阅读器天线之间的极化损耗降低，因此使用拟议天线的阅读器和标签之间的最大读取范围比类似的线性极化标签天线大4.7 m。因此，在915 MHz时可获得15.66 m的最大读取范围和1.28 dBic的增益。

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