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传统的圆极化阅读器天线采用单馈电微带天线方式设计,频带窄、极化特性较差。在单馈电微带天线的基础上,采用探针馈电曲线贴片的方式,在圆形铁片上开了4个对称的方形缝隙,最终设计出一种新型的UHF RFID圆极化阅读器天线。天线的结构尺寸为167.5 mm×167.5mm×3mm,阻抗带宽为870~936 MHz,3dB轴比带宽为900~918 MHz,最大增益为3.5dB。与传统的圆极化阅读器天线相比,设计的天线频带宽,且极化特性得到良好改善,能够满足工程上的应用需求。
The traditional circularly polarized reader antenna uses a single-feed microstrip antenna design, with narrow frequency band and poor polarization characteristics. On the basis of the single-feed microstrip antenna, four symmetrical square slots are opened on the circular iron plate by using the probe feed curve patch, and finally a new UHF RFID circular polarization reader is designed antenna. The antenna has a structure dimension of 167.5 mm × 167.5 mm × 3 mm, an impedance bandwidth of 870 to 936 MHz, a 3dB axis bandwidth of 900 to 918 MHz and a maximum gain of 3.5 dB. Compared with the traditional circularly polarized reader antenna, the designed antenna has a wide frequency band and the polarization characteristics are well improved, which can meet the engineering application requirements.