球状分层微带天线并矢格林函数的有效处理

Effective Treatment of the Dyadic Green′s Function for Microstrip Antennas in a Multilayered Spherical Media

采用提取格林函数渐进项的方法,成功克服了分层介质中球并矢格林函数计算无穷级数收敛慢的缺陷,提取出的级数形式的格林函数用球汉克尔函数的加法定理转换成闭合形式的格林函数,通过化简,使之与自由空间的格林函数有着相同的形式。因此,可采取相同的方式处理格林函数的奇异性,然后,采用以RWG为基函数的矩量法计算了圆形贴片与方形贴片微带天线的输入特性,并与文献结果、FEKO仿真结果比较,验证了方法的有效性和正确性。

It can accelerate the infinite series convergence successfully by extracting the asymptotic expressions for the dyadic＇ Green＇s function in a layered spherical media, these expressions can be expressed in a closed form by employing the spherical Han- kel function addition theorem and have the same form as the Green＇s function in free space ＇after simplification, so it can solve the integral singularity by the same way. Then, based on the well-known RWG triangular basis functions, the method of moments is developed for solving two microstrip antennas with different patches, one is circular patch and the other is square one, calculated results agree with the one from literature and FEKO software, which show the validity and effectiveness.