利用混合模型法计算微带天线间互耦

Analysis of Mutual Coupling Between Microstrip Antennas with Mixed Models

基于微带天线的传输线模型和空腔模型 ,提出了一种计算微带天线间互耦的新方法。在本方法中 ,首先根据腔模法原理 ,将微带天线等效为相距半波导波长的两个辐射缝隙 ;然后分别利用微带天线的传输线模型以及微带天线边缘面上的等效磁流分布求出微带天线的自阻抗和互阻抗 ,并进一步计算微带天线间的耦合系数。最后 ,利用本文方法编写Matlab程序求解矩形微带天线间的互耦 ,并与实验进行对比 ,比较结果验证了方法的高效性和可靠性。

In this paper, a new method,which is based on microstrip antenna's transmission -line model and cavity model, is presented to calculate the mutual coupling betw een microstrip antennas. In this method, the microstrip antenna is equivalent to two slots separated by half wavelength, and then the self and mutual impedance are got separately with transmission-line model and the equivalent magnetic curr ent distribution on the perimeter of the equivalent cavity. Consequently, the mu tual coefficient is obtained. Matlab program is written to calculate the mutual coupling between rectangular microstrip antennas, and the results are compared w ith the experiment data, which verifies the accuracy of the present method.