Abstract: For the study of effects of uniaxial anisotropy in the substrate on radiation property of cavity-backed microstrip patch antenna, the hybrid method of Edge-Based finite element (Edge-Based FEM) and boundary integral (BI) is adopted to solve the tangential electric field distribution on the surface and the cross polarization radiation pattern. The computing results show that the field distribution and cross polarization pattern of microstrip antenna with different uniaxial substrate are affected only when the optic axis is along z coordinate. When the optic axis is along x, y coordinate, the effects are neglected.

Key words: uniaxial anisotropy, cavity-backed, microstrip patch antenna, pattern, FEM

摘要： 为了研究单轴介质基片的各向异性性质对微带贴片天线辐射特性的影响，采用矢量有限元－边界积分法（Edge-Based FEM-BI）对填充单轴各向异性介质的背腔式微带贴片天线表面缝隙部分的切向电场分布及交叉极化方向图进行了计算及分析。计算结果表明仅当单轴介质的光轴沿贴片的法向方向（z轴）时，填充不同的单轴介质才会影响微带天线的场分布及最大交叉极化电平值，而当光轴沿x轴、y轴时，其影响可以忽略。

关键词: 单轴各向异性, 背腔, 微带贴片天线, 方向图, 有限元