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文章根据不停车电子计费系统(ETC)的国家标准(GB/T 20851.1-2007)要求,设计出了一款采用圆形贴片的右旋圆极化微带贴片天线,并对其馈电结构进行了传输线等效模型的理论分析。该天线采用十字型缝隙口径耦合馈电方式,结构简单,可作为ETC系统的车载单元(OBU)天线使用。经实验证实,此种类型天线不但易于产生圆极化波,而且可以得到比较理想的阻抗带宽、圆极化带宽和增益等以满足设计要求。
According to the requirements of the national standard (GB / T 20851.1-2007) of Electronic Parking System (ETC), a right circular polarization microstrip patch antenna with round patch is designed and its feeding Electrical structure of the transmission line equivalent model theoretical analysis. The antenna is cross-slotted aperture coupling feeding method, which is simple in structure and can be used as an OBU antenna of the ETC system. The experiment confirmed that this type of antenna is not only prone to circularly polarized waves, but also can get the ideal impedance bandwidth, circular polarization bandwidth and gain to meet the design requirements.