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首页> 外文期刊>Microwave and optical technology letters >COMPACT CIRCULARLY POLARIZED CIRCULAR MICROSTRIP TAG ANTENNA MOUNTABLE ON METALLIC SURFACE
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COMPACT CIRCULARLY POLARIZED CIRCULAR MICROSTRIP TAG ANTENNA MOUNTABLE ON METALLIC SURFACE

机译:可固定在金属表面上的紧凑型圆极化微带标签天线

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摘要

A compact circularly polarized circular microstrip tag antenna designed for RFID UHF band is presented. The proposed tag antenna is excited by using microstrip-line coupling-feed method. By choosing the proper lengths of two short-circuited arc microstrip lines and its coupling distance, good complex impedance matching can be obtained. Moreover, a cross slot of unequal arm lengths embedded in a circular patch is used to achieve compact circularly polarized operation. The measured 10-dB return-loss bandwidth of the tag antenna is 40 MHz (901-941 MHz), while the 3-dB axial-ratio bandwidth is 6 MHz (912-918 MHz). Further experiment shows that the tag antenna can provide a significantly increased reading range when mounted on a metallic surface.
机译:提出了一种用于RFID UHF频段的紧凑型圆极化圆形微带标签天线。所提出的标签天线是通过使用微带线耦合馈电方法来激励的。通过选择两条短路电弧微带线的适当长度及其耦合距离,可以获得良好的复阻抗匹配。此外,嵌入圆形贴片中的臂长不等的十字槽用于实现紧凑的圆极化操作。测得的标签天线的10 dB回波损耗带宽为40 MHz(901-941 MHz),而3-dB轴向比率带宽为6 MHz(912-918 MHz)。进一步的实验表明,当标签天线安装在金属表面上时,可以提供更大的读取范围。

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