电流路径法在微带天线设计中的应用研究

Studies of Surface Current Flow Path on Microstrip Patch Antenna

微带贴片天线上的电流分布与它的工作模式、谐振频率有直接关系。通过分析微带天线贴片表面的电流分布来优化微带天线的结构,从而使天线性能满足要求,这种方法直观、有效,在国内外已被广泛采用。文中由规则矩形贴片的谐振频率和该贴片上的电流分布出发,探讨在保持电流路径长度不变的情况下,贴片形状的变化对谐振频率的影响,从而找到应用电流路径法设计多波段天线的更一般性的规律。

In general, the modes and resonant frequency of microstrip patch antennas is directly related to the distribution of surface current on the patch. According to the relationship between them, we could optimize the structure of antenna to get the required performance. This method is intuitional and effective. In this paper, the resonant frequency and surface current distribution of a microstrip rectangle patch antenna is researched firstly. And then the figure of the patch is modified, which results in the change of its resonant frequency and surface current flow path. By investigating the change, some useful rules are gained.