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本文提出了一款使用于超高频(ultrahigh frequency,UHF)频段的射频识别(radio frequency identification,RFID)读写器圆极化层叠结构微带天线,采用廉价的FR4板材为基板、空气为介质层、辐射贴片采用对角线切角的结构。为了使天线有足够的阻抗带宽和较为对称的辐射方向性图,本设计采用半波微带匹配和扇形微带匹配相结合的技术。通过高频结构仿真器(high frequency structure simulator,HFSS)三维电磁仿真软件对天线模型进行了仿真分析,仿真与测试结果吻合良好。结果表明:回波损耗S11均小于-15d B的阻抗带宽为129MHz(838MHz—967MHz),轴比(Axial Ration,AR)小于3d B的带宽为30MHz(868MHz至898MHz),有效频带内增益均大于7.86d B,辐射效率高于97.4%。所设计的天线能很好的满足UHF RFID读写器的应用要求,并具有良好的应用前景。
In this paper, a radio frequency identification (RFID) reader-based circularly polarized microstrip antenna is proposed for use in the ultrahigh frequency (UHF) band. The low cost FR4 plate is used as the substrate and the air is used as the medium Layer, the radiation patch diagonal chamfer structure. In order to make the antenna have sufficient impedance bandwidth and more symmetrical radiation pattern, this design uses a combination of half-wave microstrip microstrip matching and fan-shaped microstrip technology. The antenna model was simulated and analyzed by the high-frequency structure simulator (HFSS) 3D electromagnetic simulation software. The simulation and test results are in good agreement. The results show that the bandwidth of the impedance with S11 less than -15d B is 129MHz (838MHz-967MHz) and the bandwidth of less than 3dB is 30MHz (868MHz-898MHz) 7.86d B, radiation efficiency higher than 97.4%. The designed antenna can well meet the application requirements of UHF RFID reader and has good application prospect.