利用分析方法计算微带天线的阻抗

Using Analysis Method to Calculate the Impedence of Microstrip Antennas

在微波集成电路以及微带阵列的设计中，必须考虑微带结构中存在的相互间的电磁耦合。在采用电场积分方程法和矩量法对这些微带单元的相互耦合进行分析时会遇到索沫菲积分（Ｓｏｍ ｍ ｅｒｆｅｌｄ Ｉｎｔｅｇｒａｌｓ）的计算，由于该积分的存在使得对以上问题的分析十分复杂。为了提高计算和分析的效率，本文采用了一种新的渐近抽取与展开技术〔１〕来分析计算索沫菲积分，利用该方法可以降低索沫菲积分的维数，从而达到提高计算效率的目的。最后利用这种方法计算了某些微带天线的阻抗，结果表明利用本文方法具有较高的计算效率。

The mutual coupling between microstructures should be taken into account in the designs of microwave intrgrated circuits and microwave array. Unfortunetely, the tedious calculation of Sommerfeld Integrals which occur when Electronic field integral equation (EFIE) and Moment Method (MM) are used to deal with the mutual coupling has made the analysis of mutual coulping difficult. In this paper, a new method combining asymptotic extracting technique and expansion method 〔1〕was presented. Using this method the dimension of the Sommerfeld Integrals were lowered so the aim to improve the calculation efficiency could be achieved. Finally, the impendance of several microstrip antennas were determined by this method to demonstrate the efficiency of this method. Numerical results have shown the high efficiency of the method.