新型圆极化微带天线在物流仓储中的研究与设计

摘要

The reader antenna plays a vital role in the communication of RFID system,antenna design and manufacturing technology directly affect the function of the RFID system.In order to achieve flexibility,efficiency and accuracy of information gathering process in RFID system,this paper presents a new type of circular polarization microstrip antenna using Rogers TMM4 as the dielectric layer.A coaxial probe radiation patch is used to feed the rectangular radiating patches in the two long sides which are cut by two equilateral triangles.The cut microstrip antenna works in a circular polarization,and can increase the operating bandwidth of microstrip antenna,reduce the reflection coefficient.Simulation shows that the lowest reflection coefficient of the antenna is-14.426 dB,center frequency is 915 MHz,the reflection coefficient is less than-10 dB,and bandwidth range is 910～ 923 MHz,Its gain is up to 5 dB.%在RFID系统中,读写器天线在数据通信过程中起着至关重要的作用,天线的设计及其制造技术会直接影响整个RFID系统的功能.为了使RFID技术在仓储管理的信息采集过程中更加灵活、高效、准确.设计了一种新型圆极化微带天线,采用Rogers TMM4作为介质层,通过同轴探针对辐射贴片进行馈电,对长方形辐射贴片的两条长边采用等边三角形切割,该切割使微带天线工作方式变为圆极化,同时增加了微带天线的工作带宽,降低了反射系数.该天线的仿真表明反射系数最低为-14.426 dB,中心工作频率为915 MHz,反射系数小于-10 dB的带宽范围为910～923 MHz,增益高达5 dB.