中文摘要：

本文提出了一种适用于我国UHF RFID读写器的宽带圆极化叠层微带天线.通过选用廉价FR4板、空气层介质和对角线切角的正方形贴片组成叠层结构,采用S型水平蜿蜒带条激励主辐射贴片的馈电方式,展宽了天线的阻抗带宽和轴比带宽.所提出的S型水平蜿蜒带条馈电技术,实现了对称的辐射方向性图.给出了天线设计思路,并利用电磁仿真软件分析了天线性能,仿真与测试结果吻合良好.测试结果表明：天线具有较好的性能,VSWR〈1.5的阻抗带宽达26.6%（722-944MHz）,轴比小于3dB的圆极化带宽达10.8%（838-934MHz）,在3dB轴比带宽内增益大于8.5dBi.所设计的天线能满足我国UHF RFID读写器的应用要求,具有良好的应用前景.

英文摘要：

A novel broadband circularly polarized stacked patch antenna is proposed for Chinese UHF radio frequency identification（RFID） reader/writer applications.The antenna is composed of two corner truncated patches and an S-shaped horizontally meandered strip（HMS）,all of which are printed on the upper side of the FR4 substrates.One end of the S-shaped HMS is connected to the main radiating patch by a probe,while the other end is connected to an SMA connector.Using the proposed S-shaped HMS feed technique,a good impedance matching and symmetrical broadside radiation patterns can be achieved.Simulation results are compared with the measurements,and a good agreement is obtained.The measurements show that the antenna has an impedance bandwidth（VSWR1.5） of about 26.6%（722-944MHz）,a 3dB axial ratio（AR） bandwidth of about 10.8%（838-934MHz）,and a gain level of about 8.5dBi or larger within the 3dB AR bandwidth.Therefore,the proposed antenna can be a good candidate for UHF RFID readers/writers operating between 840 and 928MHz.