背腔式微带贴片天线的近场分布和交叉极化方向图的数值计算

Numerical Computations of Near-field Distribution and Cross-polarization Radiation Pattern of Cavity-backed Microstrip Patch Antenna

采用矢量有限元———边界积分混合方法针对带有背腔结构的微带贴片天线进行了数值计算。首先计算了E面、H面方向图 ,用于验证该混合方法的正确性 ;接着计算了在第一谐振频点f1=1.96 72 4G、第二谐振频点f2 =2 .85G处天线表面缝隙处的电场分布 ,同时讨论了天线的交叉极化方向图在两个谐振点的变化 ;最后分别针对在失谐状态下、电介质的不同损耗正切角、加有探针负载等情况 ,计算了相应的交叉极化方向图 。

In this paper, the hybrid method of Edge Based finite element method and boundary integral is used for solving near field distribution and cross polarization pattern of cavity backed microstrip patch antenna. Firstly, radiation patterns of E plane and H plane are calculated for validity of this hybrid method. Then the electric field distribution in surface aperture is obtained at two working frequencies f 1=1.96724G and f 2=2.85G.,and simultaneity the differences of cross polarization radiation patterns at the two frequencies are discussed. Finally, cross polarization radiation patterns are analyzed in terms of different working frequencies, different tanδ, pin loaded.