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针对RFID电子标签的小型化和空间可压缩的要求,提出了一种新的工作于UHF频段RFID的非等螺距螺旋标签天线。首先应用经典等距螺旋天线理论,探讨了非等距螺旋天线的辐射特性;然后通过分析电磁波在不同介质层界面对辐射特性的影响,提出了多介质层填充结构,以实现多层介质标签天线,提高天线辐射效能;最后利用CST软件对非等距螺旋天线进行优化仿真并与实物的测试结果进行对比,二者基本吻合。实测结果表明:该介质结构下的非等距螺旋天线在871~928MHz频带范围内回波损耗优于-10d B,最大增益为2.8d Bi,3d B波瓣宽度约为86°,尺寸仅为64mm×Φ6mm。
Aiming at the requirement of miniaturization and space compressibility of RFID electronic tags, a new non-equal pitch spiral tag antenna operating on UHF RFID is proposed. Firstly, the classical isometric spiral antenna theory is applied to investigate the radiation characteristics of the non-equidistant spiral antenna. Then, by analyzing the influence of the electromagnetic wave on the radiation characteristics at different dielectric layers interface, a multi-dielectric layer filling structure is proposed to realize the multi-media label antenna , Improve the radiation efficiency of the antenna; Finally, using CST software to optimize the non-equidistant spiral antenna simulation and comparison with the physical test results, the two basically consistent. The measured results show that the non-equidistant helical antenna under the medium structure has a better return loss than -10d B in the frequency band of 871-928MHz, the maximum gain is 2.8d Bi, the 3dB lobe width is about 86 °, and the size is only 64mm × Φ6mm.