基于腔模理论讨论矩形微带天线远区场

Discussion about the Rectangular Microstrip Antennas Far Field Based on the Cavity Model Theory

微带天线是由导体薄片粘贴在背面有导体接地的介质基片上形成的天线。利用腔模理论对矩形微带天线远区场求解时,将微带天线看作是一个矩形谐振腔,可列出腔内波动方程,求出内场。并利用侧壁磁流等效其微带天线窄缝四周面磁流密度,再用矢量电位求出远区场和方向函数表达式。该方法条理清楚,分析简明,结合经验修改,能达到工程上的要求。

The microstrip antenna is one glued by the thin slice of conductor to the medium substrate forms with the conductor to earth on the back. When cavity model theory is used to find the rectangular microstrip antennas far zone field, regards the microstrip antennas as rectangular resonant cavity, lists the wave equation in the cavity, extracts the infield, and the magnetic current using the formula, and extracts the far field and the directivity function expression by using the vector electric potential, This method is clear and the analysis is simple, If modified with experience, it can reach the engineering needs.