介质覆层对圆柱共形微带天线性能的影响研究

Study on the Effect of the Dielectric Cladding on the Performance of Cylindrical Conformal Microstrip Antennas

研究了圆柱共形微带天线加载介质层对天线性能的影响。首先采用互易定理分析了加载介质层后圆柱共形微带天线辐射特性,然后运用有限元法计算了天线的方向图,与文献结果进行了比较,验证了程序的有效性。最后,对不同介质覆层厚度和不同覆盖层介电常数下天线的散射参数和辐射方向图进行了仿真。结果表明,圆柱共形微带天线加载介质层后,天线的谐振频率产生了漂移而且阻抗带宽明显降低,介质层厚度对天线阻抗带宽的影响较大,而介电常数的影响相对较小。

The effect of the dielectric cladding on the performance of cylindrical conformal microstrip antennas was studied. Firstly, the radiation characteristic of cylindrical conformal microstrip antenna with dielectric cladding was analyzed by using reciprocity theorem. Then, the FEM was applied to calculate the radiation patterns of the antennas and the resuits were compared with the experimental results to verify the program validity. Finally, the scattering parameters and radiation patterns of the antennas with different values of the dielectric cladding thickness and dielectric constant were simulated. The calculated results show that the antennas have a resonance frequency drift and impedance bandwidth decrease after loading dielectric layer. The influence of the dielectric cladding thickness on impedance bandwidth is greater than that of the dielectric constant.