具有多层介质的微带贴片天线的理论分析及应用

具有多层介质的微带贴片天线的理论分析及应用 THE ANALYSIS AND APPLICATION OF THE THEORY OF MICROSTRIP PATCH ANTENNAS WITH MULTILAYER SUBSTRATES 范治波 Fan Zhibo 1 first-author 黄景熙 Huang Jingxi 1 武汉大学空间物理系 武汉大学空间物理系 Department of Space Physics,Wuhan University Department of Space Physics,Wuhan University 本文对具有多层介质微带贴片天线的准静态电容进行了分析。电容公式的推导是基于应用在二维付里叶变换域中的伽略金法,推导的结果适用于任意形状的微带贴片。根据计算的电容,就可以求得有效贴片边长或有效相对介电常数以便说明边缘场的影响。由此就能精确地预测天线的特性,如谐振频率。本文将所作的这种理论应用于等边三角形微带贴片天线和具有两层介质覆盖的矩形微带贴片天线,并给出了等边三角形微带贴片天线的有效贴片边长和具有两层介质覆盖的矩形微带贴片天线的有效相对介电常数的数值结果。计算的等边三角形微带贴片天线的谐振频率值和矩形微带贴片天线的归一化电容值分别与参考文献中的测量值和计算值相比较,一致性很好。 A general approach for deriving the quasic-static capacitance of microstrip patch antennas with multilayer substrates is presented. The formulation is based upon Galerkin’s method applied in twodimensional Fourier transform domain The expression for the capacitance can be used for a microstrip patch of an arbitrary shape According to the computed capacitance the effective patch side length or effective rela tive permittivity can be obtained to accunt for the fringing field effects for predioting accurately the antenna properties like the resonant frequency. The general theory is applied to equilateral triangular microstrip patch antennas and rectangular microstrip patch antennas covered with two dielectric layers. Numerical results for the effective patch side length of equilateral triangular microstrip patch antennas and the effective relative permittivity of rectangular microstrip patch antennas covered with two dielectric layers are presented. The computed values of resonant freqnencies of equilateral triangular microstrip antennas and normalized capactanices of rectangular microstrip patch antennas are compared with measured values and computed values in the literature respectively,and the agreement is found to be quite good. 微带贴片天线 付里叶变换 彻略金法 腔体模型 microstrip patch antenna Fourier transform Galerkin’s method cavity model 1991-03-01 2021-04-01 3