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用模式展开理论分析了卫星导航接收机常用的天线——矩形切角圆极化贴片天线的场结构、圆极化轴比和切角尺寸的关系,导出了该类型天线的内场分布、远场辐射方向图表达式,计算了圆极化轴比受切角尺寸的影响程度,并给出了归一化切角尺寸和圆极化轴比的关系曲线。L波段天线实例表明,理论计算结果和基于有限元法的HFSS软件仿真结果一致性较好,本文分析结果可用于导航接收机天线设计,简化设计过程。
Based on the pattern expansion theory, the field structure, the ratio of circular polarization axis and the size of the chamfer are analyzed, which is commonly used in satellite navigation receivers. The distribution of the inner field of the antenna is derived, Far-field radiation pattern is used to calculate the influence of the circular polarization axis ratio on the size of the chamfer. The normalized chamfer angle and circular polarization axis ratio are also given. The experimental results of L-band antenna show that the theoretical calculation results are in good agreement with the HFSS software simulation results based on the finite element method. The results of this paper can be used in navigation receiver antenna design and simplify the design process.